Pairwise Interaction Extended Point-Particle (PIEP) Model for droplet-laden flows: Towards application to the mid-field of a spray
|
|
- Winfred Lynch
- 5 years ago
- Views:
Transcription
1 Pairwise Interaction Extended Point-Particle (PIEP) Model for droplet-laden flows: Towards application to the mid-field of a spray Georges Akiki, Kai Liu and S. Balachandar * Department of Mechanical & Aerospace Engineering University of Florida Gainesville, FL Euler-Lagrange (EL) methodology is the common approach used to simulate the collective dynamics of a very large number of dispersed droplets in the mid region of a spray. Traditional point-particle models used in these EL simulations assume the force on a droplets to depend only on mean Reynolds number and volume fraction. This approximation ignores interactions among the droplets at the microscale and therefore significantly under-predicts fluctuations in droplet velocity and feed-back forces, resulting in incorrect mesoscale structures and macroscale dispersion. This study introduces a new extended point-particle force model that attempts to rigorously account for the hydrodynamic influence of the neighboring droplets. The model computes the drag and lift forces, and heat/mass transfer on each droplet by accounting for the precise location of few surrounding neighbors. A pairwise interaction is assumed to superpose the perturbation fields induced by each neighbor and the Faxén form is used to obtain the forces and heat transfer. The model is tested for the cases of a random array of stationary and freely sedimenting particles. The ultimate objective if our ONR Multi-University Research Initiative (MURI) project is to demonstrate multiphysics control of liquid sprays. The talk will also present on-going effort at simulation of mid-field region of a spray where a turbulent inflow of gas with a dispersed distribution of droplets is specified. While first generation simulations will employ standard point-particle models, the goal is to employ the PIEP model and to firmly establish the role of droplet-droplet interaction in such dense droplet-laden flows. * Corresponding author, bala1s@ufl.edu
2 Introduction Efficient and effective control of droplet spray is a problem of great interest in many engineering applications. The present work is part of a Multidisciplinary University Research Initiative (MURI) that has been funded by the Office of Naval Research to explore active control of the atomization process with an integrated simulation and experimental approach. The coordinated effort is further divided into near-field and mid-field control of the spray. This short paper is to provide an update on the progress made towards largescale simulations of mid-field control of spray droplets and their dispersion using acoustic and electrostatic forcing. We define the near-field as the region where all the primary breakup of the liquid jet into droplets, and most of the subsequent breakups into a fine droplet spray is complete. Thus, control of droplet size spectra is primarily in the near-field. Control of the spatial distribution of the droplet spray in the radial direction, using active acoustic and electrostatic forcing is the primary goal of the mid-field simulation. With this in mind, we pursue a Euler-Lagrange (EL) dispersed turbulent multiphase flow simulation strategy for the mid-field. In the EL methodology, the location of all the droplets, or a subset of computational droplets that accurately represent the actual distribution in a statistical sense, is tracked. Since the flow around the individual droplets is not resolved, a point-particle (PP) model is used to track the trajectory of the computed droplets by solving their equations of motion. The accuracy of the Eulerian-Lagrangian point-particle (EL-PP) technique is dependent on the fidelity of the force, thermal and mass transfer couplings laws used for representing the fluiddroplet mass, momentum and energy exchange that occurs at the microscale. These closure models must account for the net effect of the droplet-flow interactions that happen at the microscale, which are unresolved in the EL-PP approach. In the dilute limit when the droplet size is smaller than the ambient flow scales, force models, such as the standard drag law, provide an excellent closure [1]. At intermediate droplet volume fraction, the effects of indirect interaction between the droplets as mediated by the surrounding gas flow starts to become important. With further increase in volume fraction, the probability of direct collisions between the droplets increases, which further can lead to collision-induced agglomeration and breakup of droplets. Recent EL-DEM (discrete element method) simulations of dispersed multiphase flow partially account for these effects through volume fraction dependent drag coefficient and collision detection [2-5]. Such models however do not make use of information on the location of neighboring droplets on the motion of each droplet, except abruptly when they collide. The purpose of this paper is to briefly describe the recently developed pairwise interaction expended pointparticle (PIEP) model that systematically accounts for the effect of neighbors on the motion of individual particles. The PIEP model includes lubrication and direct collisional effects. The model as described below has been developed and tested for forces and torque on rigid spheres and is currently being extended for droplets and bubbles and also for including other effects such as heat and mass transfer. We will also briefly present our initial progress towards accurate simulation of the mid-field of a spray. In the future these simulations will be performed with the inclusion of the PIEP model. PIEP Model The PIEP model is built upon two basic ideas. First, the undisturbed flow at each droplet location, defined as the flow that would exist at a droplet location in the absence of that droplet but with all other droplets present, is separated into two parts: a macroscale flow that accounts for the collective action of all the droplets and a microscale flow that accounts for the presence of all the neighbors taken one at a time (this is the pairwise interaction approximation). Second, the above defined undisturbed flow is used to calculate the net aerodynamic force and torque on the droplet using the Faxén form of the quasi-steady, added-mass, Basset history, and vorticity-induced (lift) forces relation (and similarly for the torque), since the undisturbed flow obtained from the first step is non-uniform. The important aspect of the PIEP model is it attempts to systematically account for the microscale flow induced by the neighbors by making use of their precise location, an information which is readily available in EL simulations. By accounting for the precise location of neighbors, the PIEP model goes beyond the mean neighborhood information of local droplet volume fraction, and distinguishes the influence of upstream, downstream and laterally located neighbors. Such droplet-droplet interaction information is critical in order to capture phenomenon such as collision and close-range interaction of droplets. It is important to note that PIEP model retains the computational efficiency of the standard Euler-Lagrange PP approach. The microscale perturbation field induced by a neighbor can be easily computed for a range of Reynolds number and ambient conditions. Which can then be used to pre-compute the pairwise interactions and store as PIEP maps. These maps are then used repeatedly to calculate the microscale contribution to hydrodynamic force and torque. The implementation of the complete PIEP model requires the use of seven force maps. There maps correspond to (i) streamwise velocity perturbation, (ii)
3 transverse velocity perturbation, (iii) streamwise component of perturbation stress-gradient force, (iv) transverse component of perturbation stress-gradient force, (v) perturbation vorticity, (vi) streamwise twoparticle correction, and (vii) transverse two-particle correction. Here streamwise direction is along the macroscale ambient flow seen by the moving particle and transverse direction is perpendicular in the plane formed with the neighbor (see [6-7] for details of the model and notations). Each map is a function of streamwise and transverse distance between the reference particle and the neighbor, whose effect on the reference particle is being computed. Figure 2 shows a plot of the streamwise component of the total force on the reference particle due to the presence of a neighbor (marked as the black circle) at four different Reynolds numbers. Both particles are held fixed in a uniform ambient flow directed along the positive x direction. Results As an example of the force map, Figure 1 shows contours of the streamwise and transverse components of the pressure gradient force on the reference particle due to the presence of a neighbor (pressure component of maps 3 and 4) at one Reynolds number. Since the center of the reference particle cannot get closer than one diameter the contours are absent in the annular region around the neighbor. Figure 2: Contour plot of the non-dimensional streamwise force on a particle whose center is located at (x, y) in the presence of a second particle located at the origin (marked by the dark circle) predicted by the PIEP model. Results for four different Reynolds numbers are shown. Figure 1: Mapping of the pressure gradient force on a reference sphere whose center is a distance (x,y) from the neighboring sphere (which is marked by the black circle). a) streamwise and b) spanwise components for Re i = 87. We present results from a test where eighty spheres are randomly released to settle in a large periodic computational box. This problem was simulated using fully resolved DNS using immersed boundary method [8,9] using a grid resolution of 20 points per particle diameter. The problem is also simulated using EL methodology with PIEP model where we only solved for the translational and rotational motion of the 80 spheres. As a result the PIEP model simulation is orders of magnitude faster than the DNS. In the PIEP model, we limit the number of neighbors used to 30. Figure 3 shows a comparison of the spatial dispersion of the 80 spheres at time t = 46. In comparison EL simulation using the standard drag would predict all the spheres settling at the same rate without any interaction or dispersion. We can observe very good comparison between the DNS and PIEP simulations.
4 Mid-Field Simulations As a preliminary result we finally show results from an initial mid-field simulation of a gas jet of inlet Reynolds number of An inlet Gaussian velocity distribution with random initial perturbation was applied. Although only axial gas velocity is shown in Figure 4, the present one-way coupled simulations included ability to inject at the inlet a specified inlet distribution of droplet spectra. We envision performing two-way coupled turbulent simulations with PIEP model implemented to account for both gas-droplet and droplet-droplet interactions. Nek5000, the code used for the above simulation, employs a higher-order accurate spectral element methodology to which Lagrangian droplet tracking capability has recently been added by us. The preliminary simulation shown in figure 4 employs a modest grid of about 3 million grid points. Acknowledgements This work was sponsored by the Office of Naval Research (ONR) as part of the Multidisciplinary University Research Initiatives (MURI) Program, under grant number N The views and conclusions contained herein are those of the authors only and should not be interpreted as representing those of ONR, the U.S. Navy or the U.S. Government. References 1. Crowe, C. T., Schwarzkopf, J. D., Sommerfeld, M., & Tsuji, Y. (2011).Multiphase flows with droplets and particles. CRC press. 2. Beetstra, R., Van der Hoef, M. A., & Kuipers, J. A. M. (2007). Drag force of intermediate Reynolds number flow past mono and bidisperse arrays of spheres. AIChE Journal, 53(2), Tenneti, S., Garg, R., & Subramaniam, S. (2011). Drag law for monodisperse gas solid systems using particle-resolved direct numerical simulation of flow past fixed assemblies of spheres. International journal of multiphase flow, 37(9), Zaidi, A. A., Tsuji, T., & Tanaka, T. (2014). A new relation of drag force for high Stokes number monodisperse spheres by direct numerical simulation. Advanced Powder Technology, 25(6), Deen, N. G., et al. "Review of discrete particle modeling of fluidized beds." Chemical Engineering Science 62.1 (2007): Akiki, G., Jackson, T. L., & Balachandar, S. (2017). Pairwise interaction extended point-particle model for a random array of monodisperse spheres. Journal of Fluid Mechanics, 813, Akiki, G., Jackson, T., & Balachandar, S. (2016, November). Pairwise Interaction Extended Point Particle (PIEP) Model for a Random Array of Spheres. In APS Meeting Abstracts. 8. Uhlmann, M. (2005). An immersed boundary method with direct forcing for the simulation of particulate flows. Journal of Computational Physics, 209(2), Akiki, G., & Balachandar, S. (2016). Immersed boundary method with non-uniform distribution of Lagrangian markers for a non-uniform Eulerian mesh. Journal of Computational Physics, 307,
5 Figure 3: Side view of 80 sedimenting spheres starting from a random initial distribution at t = Both the DNS results as well the PIEP model prediction are shown. Figure 4: Streamwise velocity contours on the mid-plane passing through a cylindrical turbulent jet. A Gaussian inflow with random perturbation is specified as the inlet on the left.
Experience with DNS of particulate flow using a variant of the immersed boundary method
Experience with DNS of particulate flow using a variant of the immersed boundary method Markus Uhlmann Numerical Simulation and Modeling Unit CIEMAT Madrid, Spain ECCOMAS CFD 2006 Motivation wide range
More informationModeling of dispersed phase by Lagrangian approach in Fluent
Lappeenranta University of Technology From the SelectedWorks of Kari Myöhänen 2008 Modeling of dispersed phase by Lagrangian approach in Fluent Kari Myöhänen Available at: https://works.bepress.com/kari_myohanen/5/
More informationNumerical Simulation of Elongated Fibres in Horizontal Channel Flow
Martin-Luther-Universität Halle-Wittenberg Mechanische Verfahrenstechnik 4th Workshop on Two-Phase Flow Predictions Halle, 7-0 September 05 Numerical Simulation of Elongated Fibres in Horizontal Channel
More informationDeveloping improved Lagrangian point particle models of gas-solid flow from particle-resolved direct numerical simulation
Center for Turbulence Research Proceedings of the Summer Program 1 5 Developing improved Lagrangian point particle models of gas-solid flow from particle-resolved direct numerical simulation By S. Subramaniam,
More informationSimulation of Particulate Solids Processing Using Discrete Element Method Oleh Baran
Simulation of Particulate Solids Processing Using Discrete Element Method Oleh Baran Outline DEM overview DEM capabilities in STAR-CCM+ Particle types and injectors Contact physics Coupling to fluid flow
More informationBeyond the Point Particle: LES-Style Filtering of Finite-Sized Particles
ILASS Americas th Annual Conference on Liquid Atomization and Spray Systems, Chicago, IL, May 7 Beyond the Point Particle: LES-Style Filtering of Finite-Sized Particles Brooks Moses and Chris Edwards Department
More informationModeling Complex Flows! Direct Numerical Simulations! Computational Fluid Dynamics!
http://www.nd.edu/~gtryggva/cfd-course/! Modeling Complex Flows! Grétar Tryggvason! Spring 2011! Direct Numerical Simulations! In direct numerical simulations the full unsteady Navier-Stokes equations
More informationBest Practice Guidelines for Computational Turbulent Dispersed Multiphase Flows. René V.A. Oliemans
Best Practice Guidelines for Computational Turbulent Dispersed Multiphase Flows René V.A. Oliemans ERCOFTAC Seminar, Innventia, Stockholm, June 7-8, 2011 1 Vermelding onderdeel organisatie Department of
More informationMultiphase Flows. Mohammed Azhar Phil Stopford
Multiphase Flows Mohammed Azhar Phil Stopford 1 Outline VOF Model VOF Coupled Solver Free surface flow applications Eulerian Model DQMOM Boiling Model enhancements Multi-fluid flow applications Coupled
More informationEffect of turbulence on the drag and lift of a particle
PHYSICS OF FLUIDS VOLUME 15, NUMBER 11 NOVEMBER 2003 P. Bagchi a) and S. Balachandar b) Department of Theoretical and Applied Mechanics, University of Illinois at Urbana Champaign, Urbana, Illinois 61801
More informationA high resolution collision algorithm for anisotropic particle populations
A high resolution collision algorithm for anisotropic particle populations Philipp Pischke 1 and Reinhold Kneer1 1 Institute of Heat and Mass Transfer, RWTH Aachen University July 2014 Collision algorithm,
More informationCenter For Compressible Multiphase Turbulence Overview
Center For Compressible Multiphase Turbulence Overview Principal Investigator: S. Balachandar Department of Mechanical and Aerospace Engineering University of Florida Center for Compressible Multiphase
More informationContribution of inter-particle collisions on kinetic energy modification in a turbulent channel flow
Contribution of inter-particle collisions on kinetic energy modification in a turbulent channel flow Valentina Lavezzo a, Alfredo Soldati a,b a Dipartimento di Energetica e Macchine and b Centro Interdipartimentale
More informationNumerical Study Of Flue Gas Flow In A Multi Cyclone Separator
RESEARCH ARTICLE OPEN ACCESS Numerical Study Of Flue Gas Flow In A Multi Cyclone Separator Ganga Reddy C* Umesh Kuppuraj** *(Mechanical Centre of Excellence, HCL Technologies, Bangalore-562106) ** (Mechanical
More informationThe effect of momentum flux ratio and turbulence model on the numerical prediction of atomization characteristics of air assisted liquid jets
ILASS Americas, 26 th Annual Conference on Liquid Atomization and Spray Systems, Portland, OR, May 204 The effect of momentum flux ratio and turbulence model on the numerical prediction of atomization
More informationDispersed Multiphase Flow Modeling using Lagrange Particle Tracking Methods Dr. Markus Braun Ansys Germany GmbH
Dispersed Multiphase Flow Modeling using Lagrange Particle Tracking Methods Dr. Markus Braun Ansys Germany GmbH 2011 ANSYS, Inc., Markus Braun 1 Overview The Euler/Lagrange concept Breaking the barrier
More informationVolume Displacement Effects During Bubble Entrainment in a Traveling Vortex Ring
Under consideration for publication in J. Fluid Mech. 1 Volume Displacement Effects During Bubble Entrainment in a Traveling Vortex Ring A N D R E W C I H O N S K I, J U S T I N F I N N A N D S O U R A
More informationDetailed 3D modelling of mass transfer processes in two phase flows with dynamic interfaces
Detailed 3D modelling of mass transfer processes in two phase flows with dynamic interfaces D. Darmana, N.G. Deen, J.A.M. Kuipers Fundamentals of Chemical Reaction Engineering, Faculty of Science and Technology,
More informationCHAPTER 4. Basics of Fluid Dynamics
CHAPTER 4 Basics of Fluid Dynamics What is a fluid? A fluid is a substance that can flow, has no fixed shape, and offers little resistance to an external stress In a fluid the constituent particles (atoms,
More informationComputational model for particle deposition in turbulent gas flows for CFD codes
Advanced Computational Methods and Experiments in Heat Transfer XI 135 Computational model for particle deposition in turbulent gas flows for CFD codes M. C. Paz, J. Porteiro, A. Eirís & E. Suárez CFD
More informationKinematic and dynamic pair collision statistics of sedimenting inertial particles relevant to warm rain initiation
Kinematic and dynamic pair collision statistics of sedimenting inertial particles relevant to warm rain initiation Bogdan Rosa 1, Hossein Parishani 2, Orlando Ayala 2, Lian-Ping Wang 2 & Wojciech W. Grabowski
More informationDrag Law for Bidisperse Gas-Solid Suspensions Containing Equally Sized Spheres
Ind. Eng. Chem. Res. 009, 48, 7 41 7 Drag Law for Bidisperse Gas-Solid Suspensions Containing Equally Sized Spheres Xiaolong Yin and Sankaran Sundaresan* Chemical Engineering Department, Princeton UniVersity,
More informationINTRODUCTION TO MULTIPHASE FLOW. Mekanika Fluida II -Haryo Tomo-
1 INTRODUCTION TO MULTIPHASE FLOW Mekanika Fluida II -Haryo Tomo- 2 Definitions Multiphase flow is simultaneous flow of Matters with different phases( i.e. gas, liquid or solid). Matters with different
More informationOn the validity of the twofluid model for simulations of bubbly flow in nuclear reactors
On the validity of the twofluid model for simulations of bubbly flow in nuclear reactors Henrik Ström 1, Srdjan Sasic 1, Klas Jareteg 2, Christophe Demazière 2 1 Division of Fluid Dynamics, Department
More informationTopics in Other Lectures Droplet Groups and Array Instability of Injected Liquid Liquid Fuel-Films
Lecture Topics Transient Droplet Vaporization Convective Vaporization Liquid Circulation Transcritical Thermodynamics Droplet Drag and Motion Spray Computations Turbulence Effects Topics in Other Lectures
More informationTheoretical Formulation of Collision Rate and Collision Efficiency of Hydrodynamically-Interacting Cloud Droplets in Turbulent Atmosphere
Theoretical Formulation of Collision Rate and Collision Efficiency of Hydrodynamically-Interacting Cloud Droplets in Turbulent Atmosphere Lian-Ping Wang, Orlando Ayala, Scott E. Kasprzak, and Wojciech
More informationStrategy in modelling irregular shaped particle behaviour in confined turbulent flows
Title Strategy in modelling irregular shaped particle behaviour in confined turbulent flows M. Sommerfeld F L Mechanische Verfahrenstechnik Zentrum Ingenieurwissenschaften 699 Halle (Saale), Germany www-mvt.iw.uni-halle.de
More informationProject title: A Multiscale Simulation-Based Design Platform for Cost-Effective CO 2 Capture Processes using Nano-Structured Materials (NanoSim)
Grant Agreement No.: 604656 Project acronym: NanoSim Project title: A Multiscale Simulation-Based Design Platform for Cost-Effective CO 2 Capture Processes using Nano-Structured Materials (NanoSim) Funding
More informationMomentum, energy and scalar transport in polydisperse gas-solid flows using particle-resolved direct numerical simulations
Graduate Theses and Dissertations Iowa State University Capstones, Theses and Dissertations 2013 Momentum, energy and scalar transport in polydisperse gas-solid flows using particle-resolved direct numerical
More informationNUMERICAL SIMULATION OF SUDDEN-EXPANSION PARTICLE-LADEN FLOWS USING THE EULERIAN LAGRANGIAN APPROACH. Borj Cedria, 2050 Hammam-Lif, Tunis.
NUMERICAL SIMULATION OF SUDDEN-EXPANSION PARTICLE-LADEN FLOWS USING THE EULERIAN LAGRANGIAN APPROACH Mohamed Ali. MERGHENI,2, Jean-Charles SAUTET 2, Hmaied BEN TICHA 3, Sassi BEN NASRALLAH 3 Centre de
More informationVelocity Fluctuations in a Particle-Laden Turbulent Flow over a Backward-Facing Step
Copyright c 2004 Tech Science Press CMC, vol.1, no.3, pp.275-288, 2004 Velocity Fluctuations in a Particle-Laden Turbulent Flow over a Backward-Facing Step B. Wang 1, H.Q. Zhang 1, C.K. Chan 2 and X.L.
More informationApplication of the immersed boundary method to simulate flows inside and outside the nozzles
Application of the immersed boundary method to simulate flows inside and outside the nozzles E. Noël, A. Berlemont, J. Cousin 1, T. Ménard UMR 6614 - CORIA, Université et INSA de Rouen, France emeline.noel@coria.fr,
More informationHigh Speed Aerodynamics. Copyright 2009 Narayanan Komerath
Welcome to High Speed Aerodynamics 1 Lift, drag and pitching moment? Linearized Potential Flow Transformations Compressible Boundary Layer WHAT IS HIGH SPEED AERODYNAMICS? Airfoil section? Thin airfoil
More informationEFFECT OF A CLUSTER ON GAS-SOLID DRAG FROM LATTICE BOLTZMANN SIMULATIONS
Ninth International Conference on CFD in the Minerals and Process Industries CSIRO, Melbourne, Australia 10-12 December 2012 EFFECT OF A CLUSTER ON GAS-SOLID DRAG FROM LATTICE BOLTZMANN SIMULATIONS Milinkumar
More informationarxiv: v1 [physics.flu-dyn] 16 Nov 2018
Turbulence collapses at a threshold particle loading in a dilute particle-gas suspension. V. Kumaran, 1 P. Muramalla, 2 A. Tyagi, 1 and P. S. Goswami 2 arxiv:1811.06694v1 [physics.flu-dyn] 16 Nov 2018
More informationInter-phase heat transfer and energy coupling in turbulent dispersed multiphase flows. UPMC Univ Paris 06, CNRS, UMR 7190, Paris, F-75005, France a)
Inter-phase heat transfer and energy coupling in turbulent dispersed multiphase flows Y. Ling, 1 S. Balachandar, 2 and M. Parmar 2 1) Institut Jean Le Rond d Alembert, Sorbonne Universités, UPMC Univ Paris
More informationTURBULENCE MODULATION IN LARGE EDDY SIMULATION OF BACKWARD-FACING STEP FLOW LADEN WITH PARTICLES
Engineering MECHANICS, Vol. 20, 2013, No. 3/4, p. 299 307 299 TURBULENCE MODULATION IN LARGE EDDY SIMULATION OF BACKWARD-FACING STEP FLOW LADEN WITH PARTICLES Jaroslav Volavý*, Miroslav Jícha* This work
More informationFiltered Two-Fluid Model for Gas-Particle Suspensions. S. Sundaresan and Yesim Igci Princeton University
Filtered Two-Fluid Model for Gas-Particle Suspensions S. Sundaresan and Yesim Igci Princeton University Festschrift for Professor Dimitri Gidaspow's 75th Birthday II Wednesday, November 11, 2009: 3:15
More informationSimulation analysis using CFD on vibration behaviors of circular cylinders subjected to free jets through narrow gaps in the vicinity of walls
Fluid Structure Interaction V 85 Simulation analysis using CFD on vibration behaviors of circular cylinders subjected to free jets through narrow gaps in the vicinity of walls K. Fujita Osaka City University,
More informationNUMERICAL STUDY OF TURBULENT CHANNEL FLOW LADEN WITH FINITE-SIZE NON-SPHERICAL PARTICLES
NUMERICAL STUDY OF TURBULENT CHANNEL FLOW LADEN WITH FINITE-SIZE NON-SPHERICAL PARTICLES Luca Brandt and Mehdi Niazi Ardekani Linné FLOW Centre and SeRC KTH Mechanics SE 44, Stockholm, Sweden luca@mech.kth.se
More informationApplication of DNS and LES to Dispersed Two-Phase Turbulent Flows
1 Application of DNS and LES to Dispersed Two-Phase Turbulent Flows Kyle D. Squires and Olivier Simonin Mechanical and Aerospace Engineering Department Arizona State University Tempe, AZ 85287-6106, USA
More informationSTUDY OF THREE-DIMENSIONAL SYNTHETIC JET FLOWFIELDS USING DIRECT NUMERICAL SIMULATION.
42 nd AIAA Aerospace Sciences Meeting and Exhibit 5-8 January 2004/Reno, NV STUDY OF THREE-DIMENSIONAL SYNTHETIC JET FLOWFIELDS USING DIRECT NUMERICAL SIMULATION. B.R.Ravi * and R. Mittal, Department of
More informationModelling of Gas-Solid Flows with Non-spherical Particles
Imperial College London Department of Mechanical Engineering Exhibition Road London, SW7 AZ Modelling of Gas-Solid Flows with Non-spherical Particles Fan Zhao MSc September 014 Supervised by Dr Berend
More informationCFD in COMSOL Multiphysics
CFD in COMSOL Multiphysics Mats Nigam Copyright 2016 COMSOL. Any of the images, text, and equations here may be copied and modified for your own internal use. All trademarks are the property of their respective
More informationEulerian-Lagrangian Analysis of Multiphase Flow in Urea Prilling Process with Phase Changing
A publication of 2173 CHEMICAL ENGINEERING TRANSACTIONS VOL. 32, 2013 Chief Editors: Sauro Pierucci, Jiří J. Klemeš Copyright 2013, AIDIC Servizi S.r.l., ISBN 978-88-95608-23-5; ISSN 1974-9791 The Italian
More informationSimulation of atomization : from DNS to industrial applications
Simulation of atomization : from DNS to industrial applications MUSAF III - 29/09/2016 D. Zuzio, J.-L. Estivalèzes, O. Rouzaud, P. Gajan, P. Villedieu PhD/postdoc : G. Blanchard, I. Marter, A. Orazzo,
More informationM. Mehrabadi, S. Tenneti, S. Subramaniam
Gas-phase velocity fluctuations in statistically homogeneous fixed particle beds and freely evolving suspensions using particle-resolved direct numerical simulation M. Mehrabadi, S. Tenneti, S. Subramaniam
More informationCritical shear stress for incipient motion of a particle on a rough bed
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 117,, doi:10.1029/2011jf002208, 2012 Critical shear stress for incipient motion of a particle on a rough bed Hyungoo Lee 1 and S. Balachandar 1 Received 31 August
More informationFluid Dynamics: Theory, Computation, and Numerical Simulation Second Edition
Fluid Dynamics: Theory, Computation, and Numerical Simulation Second Edition C. Pozrikidis m Springer Contents Preface v 1 Introduction to Kinematics 1 1.1 Fluids and solids 1 1.2 Fluid parcels and flow
More informationInlet Diameter and Flow Volume Effects on Separation and Energy Efficiency of Hydrocyclones
IOP Conference Series: Materials Science and Engineering PAPER OPEN ACCESS Inlet Diameter and Flow Volume Effects on Separation and Energy Efficiency of Hydrocyclones To cite this article: Erikli and A
More informationFluid Dynamics Exercises and questions for the course
Fluid Dynamics Exercises and questions for the course January 15, 2014 A two dimensional flow field characterised by the following velocity components in polar coordinates is called a free vortex: u r
More informationAccurate calculation of Stokes drag for point-particle tracking in two-way coupled flows. J.A.K. Horwitz 1 and A. Mani 1, September 24, 2015
Accurate calculation of Stokes drag for point-particle tracking in two-way coupled flows J.A.K. Horwitz 1 and A. Mani 1, September 24, 2015 Keywords: Point-particles, particle-laden turbulence, two-way
More informationDrag Force Model for DEM-CFD Simulation of Binary or Polydisperse Bubbling Fluidized Beds
Engineering Conferences International ECI Digital Archives The 4th International Conference on Fluidization From Fundamentals to Products Refereed Proceedings Drag Force Model for DEM-CFD Simulation of
More informationReynolds number scaling of inertial particle statistics in turbulent channel flows
Reynolds number scaling of inertial particle statistics in turbulent channel flows Matteo Bernardini Dipartimento di Ingegneria Meccanica e Aerospaziale Università di Roma La Sapienza Paolo Orlandi s 70th
More informationDetailed Numerical Simulation of Liquid Jet in Cross Flow Atomization: Impact of Nozzle Geometry and Boundary Condition
ILASS-Americas 25th Annual Conference on Liquid Atomization and Spray Systems, Pittsburgh, PA, May 23 Detailed Numerical Simulation of Liquid Jet in Cross Flow Atomization: Impact of Nozzle Geometry and
More informationEULER-LAGRANGE SIMULATIONS OF SEDIMENT TRANSPORT IN OSCILLATORY BOUNDARY LAYERS WITH BEDFORMS
EULER-LAGRANGE SIMULATIONS OF SEDIMENT TRANSPORT IN OSCILLATORY BOUNDARY LAYERS WITH BEDFORMS Justin R. Finn 1, Ming Li 1, Sourabh V. Apte 2 Accurate prediction of sediment transport in the presence of
More informationNumerical Simulation of Gas-Liquid-Reactors with Bubbly Flows using a Hybrid Multiphase-CFD Approach
Numerical Simulation of Gas-Liquid-Reactors with Bubbly Flows using a Hybrid Multiphase-CFD Approach TFM Hybrid Interface Resolving Two-Fluid Model (HIRES-TFM) by Coupling of the Volume-of-Fluid (VOF)
More informationBefore we consider two canonical turbulent flows we need a general description of turbulence.
Chapter 2 Canonical Turbulent Flows Before we consider two canonical turbulent flows we need a general description of turbulence. 2.1 A Brief Introduction to Turbulence One way of looking at turbulent
More informationEnhancement of Heat Transfer by an Electric Field for a Drop Translating at Intermediate Reynolds Number
Rajkumar Subramanian M. A. Jog 1 e-mail: milind.jog@uc.edu Department of Mechanical, Industrial, and Nuclear Engineering, University of Cincinnati, Cincinnati, OH 45221-0072 Enhancement of Heat Transfer
More informationNumerical study of stochastic particle dispersion using One-Dimensional-Turbulence
ILSS-mericas 29th nnual Conference on Liquid tomization and Spray Systems, tlanta, G, May 217 Numerical study of stochastic particle dispersion using One-Dimensional-Turbulence Marco Fistler *1, David
More informationDIRECT NUMERICAL SIMULATION OF LIQUID- SOLID FLOW
DIRECT NUMERICAL SIMULATION OF LIQUID- SOLID FLOW http://www.aem.umn.edu/solid-liquid_flows Sponsored by NSF-Grand Challenge Grant Fluid Mechanics & CFD Computer Scientists D.D. Joseph Y. Saad R. Glowinski
More informationDYNAMIC STABILITY OF NON-DILUTE FIBER SHEAR SUSPENSIONS
THERMAL SCIENCE, Year 2012, Vol. 16, No. 5, pp. 1551-1555 1551 DYNAMIC STABILITY OF NON-DILUTE FIBER SHEAR SUSPENSIONS by Zhan-Hong WAN a*, Zhen-Jiang YOU b, and Chang-Bin WANG c a Department of Ocean
More informationJustin Finn and Sourabh V. Apte
Simulation of Bubble and Particle Interactions with Vortical Flows Using a Discrete Element Model Justin Finn and Sourabh V. Apte School of Mechanical Industrial and Manufacturing Engineering, Oregon State
More informationEFFECT OF THE FLOW OF LARGE WATER DROPLETS
10.1515/jbe-2014-0008 EFFECT OF THE FLOW OF LARGE WATER DROPLETS ON THE WATER MIST SPRAYS László Beda 1 and Csaba Szikra 2 1 Institute of Disaster Management and Fire Protection Engineering, Szent István
More informationA combined application of the integral wall model and the rough wall rescaling-recycling method
AIAA 25-299 A combined application of the integral wall model and the rough wall rescaling-recycling method X.I.A. Yang J. Sadique R. Mittal C. Meneveau Johns Hopkins University, Baltimore, MD, 228, USA
More informationMULTIPHASE FLOW MODELLING
MULTIPHASE FLOW MODELLING 1 Introduction 2 Outline Multiphase Flow Modeling Discrete phase model Eulerian model Mixture model Volume-of-fluid model Reacting Flow Modeling Eddy dissipation model Non-premixed,
More informationModel Studies on Slag-Metal Entrainment in Gas Stirred Ladles
Model Studies on Slag-Metal Entrainment in Gas Stirred Ladles Anand Senguttuvan Supervisor Gordon A Irons 1 Approach to Simulate Slag Metal Entrainment using Computational Fluid Dynamics Introduction &
More informationA PRIORI STUDY OF THE STOCHASTIC MODEL FOR DISCRETE PHASE ACCELERATION IN A TEMPORALLY EVOLVING PLANAR JET USING DNS
June - July, Melbourne, Australia 9 P6 A PRIORI STUDY OF THE STOCHASTIC MODEL FOR DISCRETE PHASE ACCELERATION IN A TEMPORALLY EVOLVING PLANAR JET USING DNS Nabeel A. Qazi n.qazi@unsw.edu.au Haiou Wang
More informationEvaluation of Liquid Fuel Spray Models for Hybrid RANS/LES and DLES Prediction of Turbulent Reactive Flows
Evaluation of Liquid Fuel Spray Models for Hybrid RANS/LES and DLES Prediction of Turbulent Reactive Flows by Ali Afshar A thesis submitted in conformity with the requirements for the degree of Masters
More informationModified DLM method for finite-volume simulation of particle flow
Modified DLM method for finite-volume simulation of particle flow A. M. Ardekani, S. Dabiri, and R. H. Rangel Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975,
More informationWe ve all been there, sitting in a conference room,
As appeared in April 2013 PBE Copyright CSC Publishing www.powderbulk.com Particle technology: CFD modeling made easy Ray Cocco Particulate Solid Research Inc. Using computer modeling as a tool for simulating
More informationIHMTC EULER-EULER TWO-FLUID MODEL BASED CODE DEVELOPMENT FOR TWO-PHASE FLOW SYSTEMS
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), December 27-30, 2017, BITS-Pilani, Hyderabad, India IHMTC2017-13-0160 EULER-EULER TWO-FLUID
More informationNumerical Studies of Droplet Deformation and Break-up
ILASS Americas 14th Annual Conference on Liquid Atomization and Spray Systems, Dearborn, MI, May 2001 Numerical Studies of Droplet Deformation and Break-up B. T. Helenbrook Department of Mechanical and
More informationarxiv: v2 [physics.flu-dyn] 2 Dec 2014
Transport modeling of sedimenting particles in a turbulent pipe flow using Euler-Lagrange large eddy simulation arxiv:1411.1475v2 [physics.flu-dyn] 2 Dec 2014 Sunil K. Arolla a,, Olivier Desjardins a a
More informationPrinciples of Convective Heat Transfer
Massoud Kaviany Principles of Convective Heat Transfer Second Edition With 378 Figures Springer Contents Series Preface Preface to the Second Edition Preface to the First Edition Acknowledgments vii ix
More informationTurbulence Modulation by Micro-Particles in Boundary Layers
1 Turbulence Modulation by Micro-Particles in Boundary Layers Maurizio Picciotto, Andrea Giusti, Cristian Marchioli and Alfredo Soldati Centro Interdipartimentale di Fluidodinamica e Idraulica and Dipartimento
More informationD.R. Rector, M.L. Stewart and A.P. Poloski Pacific Northwest National Laboratory P.O. Box 999, Richland, WA
Modeling of Sediment Bed Behavior for Critical Velocity in Horizontal Piping 9263 D.R. Rector, M.L. Stewart and A.P. Poloski Pacific Northwest National Laboratory P.O. Box 999, Richland, WA ABSTRACT A
More informationCHARACTERISTICS OF ELLIPTIC CO-AXIAL JETS
ELECTRIC POWER 2003 March 4-6, 2003 George R Brown Convention Center, Houston, TX EP 03 Session 07C: Fuels, Combustion and Advanced Cycles - Part II ASME - FACT Division CHARACTERISTICS OF ELLIPTIC CO-AXIAL
More informationChapter 5 Phenomena of laminar-turbulent boundary layer transition (including free shear layers)
Chapter 5 Phenomena of laminar-turbulent boundary layer transition (including free shear layers) T-S Leu May. 3, 2018 Chapter 5: Phenomena of laminar-turbulent boundary layer transition (including free
More informationEffects of Forcing Scheme on the Flow and the Relative Motion of Inertial Particles in DNS of Isotropic Turbulence
Effects of Forcing Scheme on the Flow and the Relative Motion of Inertial Particles in DNS of Isotropic Turbulence Rohit Dhariwal PI: Sarma L. Rani Department of Mechanical and Aerospace Engineering The
More informationModelling multiphase flows in the Chemical and Process Industry
Modelling multiphase flows in the Chemical and Process Industry Simon Lo 9/11/09 Contents Breakup and coalescence in bubbly flows Particle flows with the Discrete Element Modelling approach Multiphase
More informationModelling of dispersed, multicomponent, multiphase flows in resource industries. Section 3: Examples of analyses conducted for Newtonian fluids
Modelling of dispersed, multicomponent, multiphase flows in resource industries Section 3: Examples of analyses conducted for Newtonian fluids Globex Julmester 017 Lecture # 04 July 017 Agenda Lecture
More informationThe Use of Lattice Boltzmann Numerical Scheme for Contaminant Removal from a Heated Cavity in Horizontal Channel
www.cfdl.issres.net Vol. 6 (3) September 2014 The Use of Lattice Boltzmann Numerical Scheme for Contaminant Removal from a Heated Cavity in Horizontal Channel Nor Azwadi Che Sidik C and Leila Jahanshaloo
More informationVerification of Sub-Grid Drag Modifications for Dense Gas-Particle Flows in Bubbling Fluidized Beds
Engineering Conferences International ECI Digital Archives The 4th International Conference on Fluidization From Fundamentals to Products Refereed Proceedings 23 Verification of Sub-Grid Drag Modifications
More informationTURBINE BURNERS: Engine Performance Improvements; Mixing, Ignition, and Flame-Holding in High Acceleration Flows
TURBINE BURNERS: Engine Performance Improvements; Mixing, Ignition, and Flame-Holding in High Acceleration Flows Presented by William A. Sirignano Mechanical and Aerospace Engineering University of California
More informationSIMULATION OF RECTANGULAR FLUIDIZED BED WITH GELDART D PARTICLES
1th International Conference on CFD in Oil & Gas, Metallurgical and Process Industries SINTEF, Trondheim, Norway 17-19 June 214 CFD 214 SIMULATION OF RECTANGULAR FLUIDIZED BED WITH GELDART D PARTICLES
More informationPIV measurements of turbulence in an inertial particle plume in an unstratified ambient
PIV measurements of turbulence in an inertial particle plume in an unstratified ambient D.B. Bryant & S.A. Socolofsky Zachry Department of Civil Engineering, Texas A&M University, USA ABSTRACT: A high-speed
More informationJournal of Computational Physics
Journal of Computational Physics 238 (2013) 1 31 Contents lists available at SciVerse ScienceDirect Journal of Computational Physics journal homepage: www.elsevier.com/locate/jcp An Euler Lagrange strategy
More informationAnalysis of Shock Motion in STBLI Induced by a Compression Ramp Configuration Using DNS Data
45th AIAA Aerospace Science Meeting and Exhibit, January 8 11, 25/Reno, Nevada Analysis of Shock Motion in STBLI Induced by a Compression Ramp Configuration Using DNS Data M. Wu and M.P. Martin Mechanical
More informationGENERALISATION OF THE TWO-SCALE MOMENTUM THEORY FOR COUPLED WIND TURBINE/FARM OPTIMISATION
25 th National Symposium on Wind Engineering, Tokyo, Japan, 3-5 December 2018 第 25 回風工学シンポジウム (2018) GENERALISATION OF THE TWO-SCALE MOMENTUM THEORY FOR COUPLED WIND TURBINE/FARM OPTIMISATION Takafumi
More informationR09. d water surface. Prove that the depth of pressure is equal to p +.
Code No:A109210105 R09 SET-1 B.Tech II Year - I Semester Examinations, December 2011 FLUID MECHANICS (CIVIL ENGINEERING) Time: 3 hours Max. Marks: 75 Answer any five questions All questions carry equal
More informationA Coupled VOF-Eulerian Multiphase CFD Model To Simulate Breaking Wave Impacts On Offshore Structures
A Coupled VOF-Eulerian Multiphase CFD Model To Simulate Breaking Wave Impacts On Offshore Structures Pietro Danilo Tomaselli Ph.d. student Section for Fluid Mechanics, Coastal and Maritime Engineering
More informationFluid Particle Interactions Basics
Fluid Particle Interactions Basics Outline u 1. Single sphere: Stokes and turbulent drag 2. Many spheres: Stokes flow 3. Many spheres: intermediate Re 4. Many spheres: terminal velocity? 1. Single sphere:
More informationProject Topic. Simulation of turbulent flow laden with finite-size particles using LBM. Leila Jahanshaloo
Project Topic Simulation of turbulent flow laden with finite-size particles using LBM Leila Jahanshaloo Project Details Turbulent flow modeling Lattice Boltzmann Method All I know about my project Solid-liquid
More informationAA214B: NUMERICAL METHODS FOR COMPRESSIBLE FLOWS
AA214B: NUMERICAL METHODS FOR COMPRESSIBLE FLOWS 1 / 29 AA214B: NUMERICAL METHODS FOR COMPRESSIBLE FLOWS Hierarchy of Mathematical Models 1 / 29 AA214B: NUMERICAL METHODS FOR COMPRESSIBLE FLOWS 2 / 29
More informationDirect Numerical Simulations of Gas-Liquid Flows
Direct Numerical Simulations of Gas-Liquid Flows 1 Gretar Tryggvason*; 1 Jiacai Lu; 2 Ming Ma 1 Johns Hopkins University, Baltimore, MD, USA; 2 University of Notre Dame, Notre Dame, IN, USA Introduction
More informationMULTIDIMENSIONAL TURBULENCE SPECTRA - STATISTICAL ANALYSIS OF TURBULENT VORTICES
Ninth International Conference on CFD in the Minerals and Process Industries CSIRO, Melbourne, Australia 10-12 December 2012 MULTIDIMENSIONAL TURBULENCE SPECTRA - STATISTICAL ANALYSIS OF TURBULENT VORTICES
More informationFinite-Size Particles in Homogeneous Turbulence
Finite-Size Particles in Homogeneous Turbulence Markus Uhlmann and Todor Doychev Institute for Hydromechanics, Karlsruhe Institute of Technology, 763 Karlsruhe, Germany E-mail: {markus.uhlmann, todor.doychev}@kit.edu
More information1D-3D COUPLED SIMULATION OF THE FUEL INJECTION INSIDE A HIGH PERFORMANCE ENGINE FOR MOTORSPORT APPLICATION: SPRAY TARGETING AND INJECTION TIMING
1D-3D COUPLED SIMULATION OF THE FUEL INJECTION INSIDE A HIGH PERFORMANCE ENGINE FOR MOTORSPORT APPLICATION: SPRAY TARGETING AND INJECTION TIMING M. Fiocco, D. Borghesi- Mahindra Racing S.P.A. Outline Introduction
More informationMULTI-SCALE SIMULATION APPROACH FOR THE FLUIDISED BED SPRAY GRANULATION PROCESS
MULTI-SCALE SIMULATION APPROACH FOR THE FLUIDISED BED SPRAY GRANULATION PROCESS STEFAN HEINRICH HAMBURG UNIVERSITY OF TECHNOLOGY, Germany NIELS DEEN & HANS KUIPERS EINDHOVEN UNIVERSITY OF TECHNOLOGY, The
More information