Multiphase Flows. Mohammed Azhar Phil Stopford
|
|
- Trevor Webster
- 5 years ago
- Views:
Transcription
1 Multiphase Flows Mohammed Azhar Phil Stopford 1
2 Outline VOF Model VOF Coupled Solver Free surface flow applications Eulerian Model DQMOM Boiling Model enhancements Multi-fluid flow applications Coupled CFD/DEM 2
3 VOF Model: New in FLUENT 14 Coupled VOF Solver Solves the momentum, pressure based continuity and volume fraction equations together. Coupled VOF solver aims to achieve faster steady state solution compared to segregated method of solving equations. 3
4 Coupled VOF Solver Select Coupled scheme as Pressure-velocity Coupling Enable Coupled with Volume Fraction option Volume Fraction Courant Number provides the additional implicit under-relaxation for VOF equation. (could help for numerically sensitive cases) TUI Recommendations for higher order momentum schemes - Lower under-relaxation for momentum - Disable high order Rhie-Chow flux through solve >set > numerics 4
5 Free Surface Flow Around the Container Ship Cutcell mesh was created by TGrid 8.533M cells half model 5
6 Free Surface Flow Around the Container Ship Segregated VOF Coupled VOF Segregated VOF converges in 1450 iterations Coupled VOF converges in 500 iterations 6
7 Free Surface Flow Around the Container Ship The free surface level plot clearly shows that segregated VOF run matches well with coupled VOF run and experimental result after 1450 iterations but not after 500 iterations. 7
8 Eulerian Model: News in FLUENT 14 DQMOM for population balance models Critical Heat flux (CHF) model 8
9 DQMOM usage Problem Cumulative size distribution of droplets at inlet available It is desired to convert the size distribution into inputs required by DQMOM (volume fraction and moment-4 values) Solution Use the Generate DQMOM Values to obtain relevant inputs for DQMOM Target application Ease of use for DQMOM problems 9
10 Modeling spray injection using DQMOM Problem Diesel type spray from Madsen thesis N-hexane injected into nitrogen gas Injection velocity = 127 m/s Nozzle diameter = 127 mu-m Modeling details Population balance model in Fluent WAVE breakup model for breakage frequency Equi-sized binary breakage or parabolic breakage pdf 10
11 Mesh 2 cells in the nozzle exit 218x55 cells k-epsilon per phase turbulence model with turbulent dispersion turned on 11
12 Comparison between homogeneous and inhomogenous model 12
13 Results Shape of the spray Velocity vectors for the spray 13
14 Comparison with experiments Comparison with experiments at x/d=400 Wu et al 14
15 Boiling models in Fluent14 We have three different models available in R14 RPI Boiling model Applicable to sub-cooled nucleate boiling Non-equilibrium Boiling Extension of RPI to take care of saturated boiling Critical Heat Flux Extension of RPI to take care of boiling crisis 15
16 Testing the CHF model CHF model of Fluent Experimental data from Hoyer Area of influence Kenning Bubble departure frequency Cole Turbulent drift force - Simonin 16
17 RPI paper validation case Vertical pipe Length: 2 m Diameter: 15.4 mm Heat Flux: 570 kw/m 2 Mass Flux: 900 kg/m 2 -s Operating pressure: 4.5 Mpa Results from Bartolomei experiments Experiments ANSYS CFD (Fluent) RPI_paper 0.1 Void fraction Temperature in K Axial distribution of Average void fraction 17
18 default settings for boiling model 18
19 Results with default settings Experiments RPI_paper F14 F14_adapted F14_2level_adapted F Axial distribution of Average void fraction 19
20 Results with various sub models other than defaults F14 default settings F14, const. AOI =2 F14, Unal, Const. AOI=2 F14, Kocamustafa, Const. AOI=2 RPI paper Experiements Axial distribution of Average void fraction 20
21 Observations 1. Mesh dependency 2. Excessive vapor generation close to Onset of boiling 21
22 Reason for Mesh dependency q wall q f q e q q q f = Single phase heat transfer to liquid Grid independent as it uses a heat transfer coefficient for liquid calculated by Fluent internally q e = Evaporation heat flux, f(t wall T sat ) Grid independent as it does not use liquid temperature from the cell next to the wall q q = Quenching heat flux, f(t wall T liq ) Grid dependent component 22
23 Solution used in CFX at R12 q q = Quenching heat flux, f(t wall T liq ) In CFX, an approach was developed to make this component grid independent Based on the temperature in the cell next to the wall and its Y+, they estimate liquid temperature at Y+=250 and use this in the above correlation This option is available in Fluent at R14 as Quenching Correction Model 23
24 Quenching correction options in Fluent14 24
25 Results with various options for quenching F14 default settings F14 with fixed y+=250 F14 with fixed temp = (Tsat - 3) K Axial distribution of Average void fraction 25
26 Checking grid independence for quenching correction option Y+= Experiments RPI_paper F14, fixed Y+ = Axial distribution of Average void fraction F14_adapted, fixed Y+=250 F14 2 level adapted, fixed Y+=250 26
27 Results with Wall lubrication Experiments RPI_paper F14, fixed Y+ = 250 F14_adapted,fixed Y+=250,WL F14 2 level adapted, fixed Y+=250, WL Axial distribution of Average void fraction 27
28 Coupled Fluid and DEM At high volume fraction of particles particle-particle interaction becomes important. With or Without Interaction with Fluid Flow 28
29 Theory: Soft Sphere DEM Discrete Element Method: DEM Cundall and Strack (1979) Soft Sphere Approach Contact forces computed from deformation. Overlap of ideal spheres used as the measure for deformation. Newtons 2 nd law integrated in time. Allows for N-body interaction. Rigidity of materials determines time scale for integration. Particle 1: mass m 1 position x 1 velocity v 1 Particle 2: mass m 2 position x 2 velocity v 2 r 1 r 2 overlap* * not to scale, greatly exaggerated 29
30 Theory: Soft Sphere DEM (cont d) Forces in Newtons 2 nd law collected from pairwise interaction. Collision laws defined for pairs of collision partners. Implemented Force Laws Spring Spring-Dashpot Friction These forces enter the equation of motion for the particle through F other Particle 1: mass m 1 position x 1 velocity v 1 Particle 2: mass m 2 position x 2 velocity v 2 r 1 r 2 F 2 30 Spring Model F F 1 ( kn ) n n x x j j F x x i i loss m 2 t 2 1 coll f Spring-dashpot Model F 1 k n 2 ln 12 ln 2 m 12 m1m 2 m m 1 2 t coll f loss m K F 1 12 overlap* * not to scale, greatly exaggerated
31 31 Fluidized Bed: Base Case Dimension 0.2 * 0.2 * 0.4 m cube. 16K Hex cells. BC Bottom: Velocity Inlet=0.5 m/s Top: Pressure Outlet=1 atm DPM Particle diameter = 750 micron 15K Parcels Volume Ratio of single mesh cell to single parcel = 5.5 DEM + DDPM Spring-Dashpot: K = 100 Eta = 0.8 (particle-particle), 1 (particle-boundary) Friction: Mu-stick = 0.5, Mu-glide = 0.2, Mu-limit = 0.1, Vel-glide = 4.6, Vel-limit = 20, Slope-limit = 2 Node based averaging (Beta) Particle time step size = 2e-4 sec No. of continuous phase iterations per DPM iteration = 200 Update DPM sources every flow iteration Drag Law = Wen-Yu
32 Fluidized Bed: Base Case Solver Settings PC SIMPLE Node based Gradients Bounded Second Order Implicit Momentum, Volume Fraction: QUICK URF: Pressure = 0.9, Momentum = 0.2, Volume Fraction, DPM = 1 32
33 Fluidized Bed: Base Case Simulation results Pressure drop balanced by the weight of the bed Realistic bubbling frequency No need for carefully tweaking of parameters: Robust results. Note Postprocessing: Showing only a slice from the full bed. 33
34 Fluidized Bed: Spring Constant Variation Compare K = 100 N/m K = 1000 N/m Time step: 5e-5 s Results independent of K K = 100 N/m sufficient 34
35 Fluidized Bed: NETL Challenge 2011 A blind challenge problem on modeling a bubbling fluidized bed of FCC particles with a Particle Size Distribution (PSD). Cf. Dimensions: 0.91m x 0.91 m x 7.41m Particle content: 1351kg initially Fine Particles have diameter < 45 μm Comparison: 12% fine particles 3% fine particles PSDs have similar mean average diameter of 85μm and 89μm. Fluidization differences from details of PSD. 35
36 Mesh: 91k cells Fluidized Bed: NETL Challenge 2011 Fluid/Particle Time Step: 0.5 ms 12% fines: initially about 512k parcels 3% fines: ditto Spring-Dashpot and Friction forces with default values for particle-particle and particle-boundary collisions. Able to simulate 16s of flow time in a day on 12 processors with a complete PSD % fines 3% fines
37 Proppant Transport Proppants are used to prop open artificial fractures created in the rock of gas fields. The placement of proppants at appropriate locations is essential for a successful fracturing operation. * 37 Case Dimensions: 3m x 0.3m x 0.03m (width x height x depth) Particle content: 444k parcels, 8.9kg at 10s. Spring-Dashpot and friction force with default values except K = 100 N/m for particle-particle and particle-wall collisions. Fluid Time Step: 2e-3s, Particle Tracking Time Step: 2.5e-4s Particle volume fraction at injection surface about Using staggering in time and space on injection surface. * colored by VOF
38 Summary ANSYS is committed to providing and supporting best in class technology in dense and dilute multiphase Continue to improve speed and fidelity through experimental validation of results. Have the most comprehensive and advanced collection of multiphase tools of any commercially available CFD code. 38
39 THANK YOU! Questions? Please contact:
CFD-Modeling of Boiling Processes
CFD-Modeling of Boiling Processes 1 C. Lifante 1, T. Frank 1, A. Burns 2, E. Krepper 3, R. Rzehak 3 conxita.lifante@ansys.com 1 ANSYS Germany, 2 ANSYS UK, 3 HZDR Outline Introduction Motivation Mathematical
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 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 informationCFD modelling of multiphase flows
1 Lecture CFD-3 CFD modelling of multiphase flows Simon Lo CD-adapco Trident House, Basil Hill Road Didcot, OX11 7HJ, UK simon.lo@cd-adapco.com 2 VOF Free surface flows LMP Droplet flows Liquid film DEM
More informationPrediction of Minimum Fluidisation Velocity Using a CFD-PBM Coupled Model in an Industrial Gas Phase Polymerisation Reactor
Journal of Engineering Science, Vol. 10, 95 105, 2014 Prediction of Minimum Fluidisation Velocity Using a CFD-PBM Coupled Model in an Industrial Gas Phase Polymerisation Reactor Vahid Akbari and Mohd.
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 informationCFD Simulation of Sodium Boiling in Heated Pipe using RPI Model
Proceedings of the 2 nd World Congress on Momentum, Heat and Mass Transfer (MHMT 17) Barcelona, Spain April 6 8, 2017 Paper No. ICMFHT 114 ISSN: 2371-5316 DOI: 10.11159/icmfht17.114 CFD Simulation of Sodium
More informationModelling of phase change for Two-Phase Refrigerant Flow inside Capillary Tube under Adiabatic Conditions
International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347 5161 2016 INPRESSCO, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article Modelling
More informationCFD and Thermal Stress Analysis of Helium-Cooled Divertor Concepts
CFD and Thermal Stress Analysis of Helium-Cooled Divertor Concepts Presented by: X.R. Wang Contributors: R. Raffray and S. Malang University of California, San Diego ARIES-TNS Meeting Georgia Institute
More informationHeat Transfer Modeling using ANSYS FLUENT
Lecture 1 - Introduction 14.5 Release Heat Transfer Modeling using ANSYS FLUENT 2013 ANSYS, Inc. March 28, 2013 1 Release 14.5 Outline Modes of Heat Transfer Basic Heat Transfer Phenomena Conduction Convection
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 informationTutorial for the heated pipe with constant fluid properties in STAR-CCM+
Tutorial for the heated pipe with constant fluid properties in STAR-CCM+ For performing this tutorial, it is necessary to have already studied the tutorial on the upward bend. In fact, after getting abilities
More informationPairwise Interaction Extended Point-Particle (PIEP) Model for droplet-laden flows: Towards application to the mid-field of a spray
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 &
More informationOutline. Advances in STAR-CCM+ DEM models for simulating deformation, breakage, and flow of solids
Advances in STAR-CCM+ DEM models for simulating deformation, breakage, and flow of solids Oleh Baran Outline Overview of DEM in STAR-CCM+ Recent DEM capabilities Parallel Bonds in STAR-CCM+ Constant Rate
More informationApplications of Computational Fluid Dynamics in the Process Industries. Ahmad Haidari & Peter Spicka Fluent Inc.
Applications of Computational Fluid Dynamics in the Process Industries Ahmad Haidari & Peter Spicka Fluent Inc. 1 Outline Overview of CFD s growth in the process Industry Overview of modeling multiphase
More informationDevelopment and Validation of the Wall Boiling Model in ANSYS CFD
Development and Validation of the Wall Boiling Model in ANSYS CFD Th. Frank, C. Lifante, A.D. Burns PBU, Funded CFD Development ANSYS Germany Thomas.Frank@ansys.com E. Krepper, R. Rzehak FZ Dresden-Rossendorf
More informationNumerical Modelling of Twin-screw Pumps Based on Computational Fluid Dynamics
Numerical Modelling of Twin-screw Pumps Based on Computational Fluid Dynamics 6-8 th March 2017 Dr Sham Rane, Professor Ahmed Kovačević, Dr Di Yan, Professor Qian Tang, Centre for Compressor Technology,
More informationCFD Simulation of Flashing and Boiling Flows Using FLUENT
CFD Simulation of Flashing and Boiling Flows Using FLUENT Hua Bai and Paul Gillis The Dow Chemical Company FLUENT UGM 2004 Liquid/Gas Phase Change found in many industrial chemical processes involves complex
More informationINVESTIGATION OF THE PWR SUBCHANNEL VOID DISTRIBUTION BENCHMARK (OECD/NRC PSBT BENCHMARK) USING ANSYS CFX
INVESTIGATION OF THE PWR SUBCHANNEL VOID DISTRIBUTION BENCHMARK (OECD/NRC PSBT BENCHMARK) USING ANSYS CFX Th. Frank 1, F. Reiterer 1 and C. Lifante 1 1 ANSYS Germany GmbH, Otterfing, Germany Thomas.Frank@ansys.com,
More informationNumerical Investigation of Nucleate Boiling Flow in Water Based Bubble Bumps
International Journal of Fluid Mechanics & Thermal Sciences 2015; 1(2): 36-41 Published online June 15, 2015 (http://www.sciencepublishinggroup.com/j/ijfmts) doi: 10.11648/j.ijfmts.20150102.14 Numerical
More informationDevelopment of a consistent and conservative Eulerian - Eulerian algorithm for multiphase flows
Development of a consistent and conservative Eulerian - Eulerian algorithm for multiphase flows Ana Cubero Alberto Sanchez-Insa Norberto Fueyo Numerical Fluid Dynamics Group University of Zaragoza Spain
More informationOverview of Turbulent Reacting Flows
Overview of Turbulent Reacting Flows Outline Various Applications Overview of available reacting flow models LES Latest additions Example Cases Summary Reacting Flows Applications in STAR-CCM+ Ever-Expanding
More informationTutorial: Premixed Flow in a Conical Chamber using the Finite-Rate Chemistry Model
Tutorial: Premixed Flow in a Conical Chamber using the Finite-Rate Chemistry Model Introduction The purpose of this tutorial is to provide guidelines and recommendations for setting up and solving the
More informationModeling of Wall-boiling Phenomena from Nucleate Subcooled Boiling up to CHF Conditions
Modeling of Wall-boiling Phenomena from Nucleate Subcooled Boiling up to CHF Conditions Thomas Frank (1), Amine Ben Hadj Ali (1), Conxita Lifante (1), Florian Kaiser (2), Stephan Gabriel (2), Henning Eickenbusch
More informationCFD SIMULATION OF THE DEPARTURE FROM NUCLEATE BOILING
CFD SIMULATION OF THE DEPARTURE FROM NUCLEATE BOILING Ladislav Vyskocil and Jiri Macek UJV Rez a. s., Dept. of Safety Analyses, Hlavni 130, 250 68 Husinec Rez, Czech Republic Ladislav.Vyskocil@ujv.cz;
More informationInter-particle force and stress models for wet and dry particulate flow at the intermediate flow regime
Inter-particle force and stress models for wet and dry particulate flow at the intermediate flow regime Xi Yu 1, Raffaella Ocone 3, Sotos Generalis 2, Yassir Makkawi 1 1 Chemical Engineering & Applied
More informationBoiling and Condensation (ME742)
Indian Institute of Technology Kanpur Department of Mechanical Engineering Boiling and Condensation (ME742) PG/Open Elective Credits: 3-0-0-9 Updated Syllabus: Introduction: Applications of boiling and
More informationCHAPTER 7 NUMERICAL MODELLING OF A SPIRAL HEAT EXCHANGER USING CFD TECHNIQUE
CHAPTER 7 NUMERICAL MODELLING OF A SPIRAL HEAT EXCHANGER USING CFD TECHNIQUE In this chapter, the governing equations for the proposed numerical model with discretisation methods are presented. Spiral
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 informationExperimental and Numerical Investigation of Two- Phase Flow through Enlarging Singularity
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 212 Experimental and Numerical Investigation of Two- Phase Flow through Enlarging
More informationCHAPTER 3 MODELLING AND ANALYSIS OF THE PACKED COLUMN
37 CHAPTER 3 MODELLING AND ANALYSIS OF THE PACKED COLUMN Absorption in a chemical process refers to a mass transfer between gas and liquid which transfers one or more components from the gas phase to the
More informationAN UNCERTAINTY ESTIMATION EXAMPLE FOR BACKWARD FACING STEP CFD SIMULATION. Abstract
nd Workshop on CFD Uncertainty Analysis - Lisbon, 19th and 0th October 006 AN UNCERTAINTY ESTIMATION EXAMPLE FOR BACKWARD FACING STEP CFD SIMULATION Alfredo Iranzo 1, Jesús Valle, Ignacio Trejo 3, Jerónimo
More informationTutorial for the supercritical pressure pipe with STAR-CCM+
Tutorial for the supercritical pressure pipe with STAR-CCM+ For performing this tutorial, it is necessary to have already studied the tutorial on the upward bend. In fact, after getting abilities with
More informationUrea Injection and Preparation in Diesel Applications Multiphase Multicomponent Modeling using Star-CD
, London Urea Injection and Preparation in Diesel Applications Multiphase Multicomponent Modeling using Star-CD Institute for Powertrains & Automotive Technology Dipl.-Phys. Simon Fischer Dr. Thomas Lauer
More informationSOE3213/4: CFD Lecture 3
CFD { SOE323/4: CFD Lecture 3 @u x @t @u y @t @u z @t r:u = 0 () + r:(uu x ) = + r:(uu y ) = + r:(uu z ) = @x @y @z + r 2 u x (2) + r 2 u y (3) + r 2 u z (4) Transport equation form, with source @x Two
More informationAPPLICATION OF RPI MODEL: PREDICTION OF SUBCOOLED BOILING AND DNB IN VERTICAL PIPES
APPLICATION OF RPI MODEL: PREDICTION OF SUBCOOLED BOILING AND DNB IN VERTICAL PIPES Rui Zhang, Wenwen Zhang, Tenglong Cong, Wenxi Tian, G H Su, Suizheng Qiu School of Nuclear Science and Technology, Xi
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 informationNumerical Investigation of Convective Heat Transfer in Pin Fin Type Heat Sink used for Led Application by using CFD
GRD Journals- Global Research and Development Journal for Engineering Volume 1 Issue 8 July 2016 ISSN: 2455-5703 Numerical Investigation of Convective Heat Transfer in Pin Fin Type Heat Sink used for Led
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 informationProject #1 Internal flow with thermal convection
Project #1 Internal flow with thermal convection MAE 494/598, Fall 2017, Project 1 (20 points) Hard copy of report is due at the start of class on the due date. The rules on collaboration will be released
More informationDEVELOPMENT OF COMPUTATIONAL MULTIFLUID DYNAMICS MODELS FOR NUCLEAR REACTOR APPLICATIONS
DEVELOPMENT OF COMPUTATIONAL MULTIFLUID DYNAMICS MODELS FOR NUCLEAR REACTOR APPLICATIONS Henry Anglart Royal Institute of Technology, Department of Physics Division of Nuclear Reactor Technology Stocholm,
More informationNumerical Modelling For Hydro Energy Convertor: Impulse Turbine
International Journal of ChemTech Research CODEN( USA): IJCRGG ISSN : 0974-4290 Vol.5, No.2, pp 1003-1008, April-June 2013 ICGSEE-2013[14 th 16 th March 2013] International Conference on Global Scenario
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 informationCFD Simulation of Binary Fluidized Mixtures: Effects of Restitution Coefficient and Spatial Discretization Methods
Engineering Conferences International ECI Digital Archives The 14th International Conference on Fluidization From Fundamentals to Products Refereed Proceedings 2013 CFD Simulation of Binary Fluidized Mixtures:
More informationMinimum fluidization velocity, bubble behaviour and pressure drop in fluidized beds with a range of particle sizes
Computational Methods in Multiphase Flow V 227 Minimum fluidization velocity, bubble behaviour and pressure drop in fluidized beds with a range of particle sizes B. M. Halvorsen 1,2 & B. Arvoh 1 1 Institute
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 informationHeat Transfer Modeling using ANSYS FLUENT
Lecture 2 - Conduction Heat Transfer 14.5 Release Heat Transfer Modeling using ANSYS FLUENT 2013 ANSYS, Inc. March 28, 2013 1 Release 14.5 Agenda Introduction Energy equation in solids Equation solved
More informationCFD simulation of gas solid bubbling fluidized bed: an extensive assessment of drag models
Computational Methods in Multiphase Flow IV 51 CFD simulation of gas solid bubbling fluidized bed: an extensive assessment of drag models N. Mahinpey 1, F. Vejahati 1 & N. Ellis 2 1 Environmental Systems
More informationINFLUENCE OF JOULE THOMPSON EFFECT ON THE TEMPERATURE DISTRIBUTION IN VERTICAL TWO PHASE FLOW
INFLUENCE OF JOULE THOMPSON EFFECT ON THE TEMPERATURE DISTRIBUTION IN VERTICAL TWO PHASE FLOW Daniel Merino Gabriel S. Bassani, Luiz Eduardo A. P. Duarte Deibi E. Garcia Angela O. Nieckele Two-phase Flow
More informationOMAE FLUID-STRUCTURE INTERACTION MODELING OF SUBSEA JUMPER PIPE
Proceedings of the ASME 2014 33 rd International Conference on Ocean, Offshore and Arctic Engineering OMAE2014 June 8-13, 2014, San Francisco, CA USA OMAE2014-24070 FLUID-STRUCTURE INTERACTION MODELING
More informationEulerian model for the prediction of nucleate boiling of refrigerant in heat exchangers
Advanced Computational Methods and Experiments in Heat Transfer XI 51 Eulerian model for the prediction of nucleate boiling of refrigerant in heat exchangers D. Simón, M. C. Paz, A. Eirís&E.Suárez E.T.S.
More informationMass flow determination in flashing openings
Int. Jnl. of Multiphysics Volume 3 Number 4 009 40 Mass flow determination in flashing openings Geanette Polanco Universidad Simón Bolívar Arne Holdø Narvik University College George Munday Coventry University
More informationCFDEM modelling of particle coating in a threedimensional
Engineering Conferences International ECI Digital Archives Fluidization XV Proceedings 5-25-2016 CFDEM modelling of particle coating in a threedimensional prismatic spouted bed Swantje Pietsch Hamburg
More informationEulerian-Lagrangian Modeling of Particle Mixing in Gas Fluidized Beds
Eulerian-Lagrangian Modeling of Particle Mixing in Gas Fluidized Beds Master of Science Thesis of Master Degree Program of Innovative & Sustainable Chemical Engineering AFARIDEH BABADOOST Department of
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 informationPrediction of Convective Boiling up to Critical Heat Flux (CHF) Conditions for Test Facilities with Vertical Heaters
Prediction of Convective Boiling up to Critical Heat Flux (CHF) Conditions for Test Facilities with Vertical Heaters Thomas Frank (1), Amine Ben Hadj Ali (1), Conxita Lifante (1), Moritz Bruder (2), Florian
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 informationChapter 5 Control Volume Approach and Continuity Equation
Chapter 5 Control Volume Approach and Continuity Equation Lagrangian and Eulerian Approach To evaluate the pressure and velocities at arbitrary locations in a flow field. The flow into a sudden contraction,
More informationPARTICLE DISPERSION IN ENCLOSED SPACES USING A LAGRANGIAN MODEL
IV Journeys in Multiphase Flows (JEM 217) March 27-31, 217, São Paulo, SP, Brazil Copyright 217 by ABCM Paper ID: JEM-217-4 PARTICLE DISPERSION IN ENCLOSED SPACES USING A LAGRANGIAN MODEL Ana María Mosquera
More informationProject 4: Navier-Stokes Solution to Driven Cavity and Channel Flow Conditions
Project 4: Navier-Stokes Solution to Driven Cavity and Channel Flow Conditions R. S. Sellers MAE 5440, Computational Fluid Dynamics Utah State University, Department of Mechanical and Aerospace Engineering
More informationTutorial 11. Use of User-Defined Scalars and User-Defined Memories for Modeling Ohmic Heating
Tutorial 11. Use of User-Defined Scalars and User-Defined Memories for Modeling Ohmic Heating Introduction The purpose of this tutorial is to illustrate the use of user-defined scalars (UDS) and user defined
More informationA CFD study of gas-solid separation in a downer pyrolysis reactor: An eulerian-eulerian approach
Engineering Conferences International ECI Digital Archives BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals Proceedings Spring 6-10-2013 A CFD study of gas-solid separation
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 informationNUMERICAL INVESTIGATION ON THE EFFECT OF COOLING WATER SPRAY ON HOT SUPERSONIC JET
Volume 119 No. 12 2018, 59-63 ISSN: 1314-3395 (on-line version) url: http://www.ijpam.eu ijpam.eu NUMERICAL INVESTIGATION ON THE EFFECT OF COOLING WATER SPRAY ON HOT SUPERSONIC JET Ramprasad T and Jayakumar
More informationTransport equation cavitation models in an unstructured flow solver. Kilian Claramunt, Charles Hirsch
Transport equation cavitation models in an unstructured flow solver Kilian Claramunt, Charles Hirsch SHF Conference on hydraulic machines and cavitation / air in water pipes June 5-6, 2013, Grenoble, France
More informationBoundary Conditions - Inlet
Boundary Conditions - Inlet Boundary Conditions Need? What is physical and mathematical significance of a boundary condition? The boundary conditions of any problem is used to define the upper and lower
More informationThis chapter focuses on the study of the numerical approximation of threedimensional
6 CHAPTER 6: NUMERICAL OPTIMISATION OF CONJUGATE HEAT TRANSFER IN COOLING CHANNELS WITH DIFFERENT CROSS-SECTIONAL SHAPES 3, 4 6.1. INTRODUCTION This chapter focuses on the study of the numerical approximation
More informationModeling of Humidification in Comsol Multiphysics 4.4
Modeling of Humidification in Comsol Multiphysics 4.4 Indrajit Wadgaonkar *1 and Suresh Arikapudi 1 1 Tata Motors Ltd. Pimpri, Pune, India, 411018. *Corresponding author: Indrajit Wadgaonkar, Tata Motors
More informationA CRITICAL ASSESSMENT ON EVAPORATIVE COOLING PERFORMANCE OF MICRO FINNED MICRO GAP FOR HIGH HEAT FLUX APPLICATIONS
A CRITICAL ASSESSMENT ON EVAPORATIVE COOLING PERFORMANCE OF MICRO FINNED MICRO GAP FOR HIGH HEAT FLUX APPLICATIONS Shugata Ahmed 1, Ahmad Faris Ismail 1, Erwin Sulaeman 1 and Muhammad Hasibul Hasan 2 1
More informationNumerical Simulation Analysis of Ultrafine Powder Centrifugal Classifier Bizhong XIA 1, a, Yiwei CHEN 1, b, Bo CHEN 2
5th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2015) Numerical Simulation Analysis of Ultrafine Powder Centrifugal Classifier Bizhong XIA 1, a, Yiwei CHEN 1,
More informationDEVELOPMENT OF A NUMERICAL APPROACH FOR SIMULATION OF SAND BLOWING AND CORE FORMATION
TMS (The Minerals, Metals & Materials Society), DEVELOPMENT OF A NUMERICAL APPROACH FOR SIMULATION OF SAND BLOWING AND CORE FORMATION G.F. Yao, C. W. Hirt, and
More informationEFFECT OF GEOMETRICAL PARAMETERS ON BOILING HEAT TRANSFER AND PRESSURE DROP IN MICRO FINNED MICRO GAP
EFFECT OF GEOMETRICAL PARAMETERS ON BOILING HEAT TRANSFER AND PRESSURE DROP IN MICRO FINNED MICRO GAP Shugata Ahmed 1, Muhammad Hasibul Hasan 2, Ahmad Faris Ismail 1 and Erwin Sulaeman 1 1 Departmental
More informationNumerical Modeling of Sampling Airborne Radioactive Particles Methods from the Stacks of Nuclear Facilities in Compliance with ISO 2889
Numerical Modeling of Sampling Airborne Radioactive Particles Methods from the Stacks of Nuclear Facilities in Compliance with ISO 2889 Author P. Geraldini Sogin Spa Via Torino 6, 00184 Rome Italy, geraldini@sogin.it
More informationInterPACKICNMM
Proceedings of ASME 2015 International Technical Conference and Exhibition & on Packaging and Integration of Electronic and Photonic Microsystems InterPACK2015 July 6-9, 2015, San Francisco, USA InterPACKICNMM2015-48129
More informationChapter 10: Boiling and Condensation 1. Based on lecture by Yoav Peles, Mech. Aero. Nuc. Eng., RPI.
Chapter 10: Boiling and Condensation 1 1 Based on lecture by Yoav Peles, Mech. Aero. Nuc. Eng., RPI. Objectives When you finish studying this chapter, you should be able to: Differentiate between evaporation
More informationMAE 598 Project #1 Jeremiah Dwight
MAE 598 Project #1 Jeremiah Dwight OVERVIEW A simple hot water tank, illustrated in Figures 1 through 3 below, consists of a main cylindrical tank and two small side pipes for the inlet and outlet. All
More informationDevelopment of a one-dimensional boiling model: Part I A two-phase flow pattern map for a heavy hydrocarbon feedstock
Development of a one-dimensional boiling model: Part I A two-phase flow pattern map for a heavy hydrocarbon feedstock Pieter Verhees, Abdul Akhras Rahman, Kevin M. Van Geem, Geraldine J. Heynderickx Laboratory
More informationValidation of Multiphase Flow Modeling in ANSYS CFD
Validation of Multiphase Flow Modeling in ANSYS CFD Th. Frank, C. Lifante, A.D. Burns Head Funded CFD Development ANSYS Germany Thomas.Frank@ansys.com 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc.
More informationThis section develops numerically and analytically the geometric optimisation of
7 CHAPTER 7: MATHEMATICAL OPTIMISATION OF LAMINAR-FORCED CONVECTION HEAT TRANSFER THROUGH A VASCULARISED SOLID WITH COOLING CHANNELS 5 7.1. INTRODUCTION This section develops numerically and analytically
More informationComparison of Heat Transfer rate of closed loop micro pulsating heat pipes having different number of turns
The International Journal of Engineering and Science (IJES) Volume 6 Issue 7 Pages PP 01-12 2017 ISSN (e): 2319 1813 ISSN (p): 2319 1805 Comparison of Heat Transfer rate of closed loop micro pulsating
More informationPredicting Size Distribution of Dispersed Phase Systems
Predicting Size Distribution of Dispersed Phase Systems Evren Bayraktar Supervisors: Prof. S.Turek (Dortmund), Dr. Ing. Otto Mierka, Dr. Ing. Frank Platte 28.11.2008, Sulzer Page 1 Outline Introduction
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 informationApplied Thermal Engineering
Applied Thermal Engineering 39 (2012) 163e170 Contents lists available at SciVerse ScienceDirect Applied Thermal Engineering journal homepage: www.elsevier.com/locate/apthermeng Numerical characterization
More informationCFD ANALYSIS OF CONVERGENT-DIVERGENT NOZZLE
1. G. SATYANARAYANA,. Ch. VARUN, 3. S.S. NAIDU CFD ANALYSIS OF CONVERGENT-DIVERGENT NOZZLE 1-3. DEPARTMENT OF MECHANICAL ENGINEERING, MVGRCE, VIZIANAGARAM, 535005, (A.P.), INDIA ABSTRACT: CFD is a branch
More informationReacting Flow Modeling in STAR-CCM+ Rajesh Rawat
Reacting Flow Modeling in STAR-CCM+ Rajesh Rawat Latest Additions (v 7.02/v 7.04) Eulerian Multi-phase Reaction Model Soot Model Moment Methods PPDF Flamelet Multi-stream model Complex Chemistry Model
More informationFluid Flow, Heat Transfer and Boiling in Micro-Channels
L.P. Yarin A. Mosyak G. Hetsroni Fluid Flow, Heat Transfer and Boiling in Micro-Channels 4Q Springer 1 Introduction 1 1.1 General Overview 1 1.2 Scope and Contents of Part 1 2 1.3 Scope and Contents of
More informationCFD-SIMULATION OF THE VVER-440 STEAM GENERATOR WITH POROUS MEDIA MODEL
CFD-SIMULATION OF THE VVER-440 STEAM GENERATOR WITH POROUS MEDIA MODEL T. Rämä, T. Toppila Fortum Nuclear Services Ltd, Finland T. J. H. Pättikangas, J. Niemi, V. Hovi VTT Technical Research Centre of
More informationMultiphase Flow Modeling & Simulation with Application to Water-Vapor Flows Through Fuel Rod Bundles of Nuclear Reactors
Multiphase Flow Modeling & Simulation with Application to Water-Vapor Flows Through Fuel Rod Bundles of Nuclear Reactors Thomas Frank ANSYS Germany, Otterfing Thomas.Frank@ansys.com 2006 ANSYS, Inc. Th.
More informationINTERNAL FLOW IN A Y-JET ATOMISER ---NUMERICAL MODELLING---
ILASS-Europe 2002 Zaragoza 9 11 September 2002 INTERNAL FLOW IN A Y-JET ATOMISER ---NUMERICAL MODELLING--- Z. Tapia, A. Chávez e-mail: ztapia@imp.mx Instituto Mexicano del Petróleo Blvd. Adolfo Ruiz Cortines
More informationFLOW BOILING HEAT-TRANSFER IN PLATE MICRO- CHANNEL HEAT SINK
International J. of Math. Sci. & Engg. Appls. (IJMSEA) ISSN 0973-9424, Vol. 10 No. I (April, 2016), pp. 257-265 FLOW BOILING HEAT-TRANSFER IN PLATE MICRO- CHANNEL HEAT SINK R. S. H. AL-KHAFAJY College
More informationComputational Analysis to Enhance Laminar Flow Convective Heat Transfer Rate in an Enclosure Using Aerosol Nanofluids
Georgia Southern University Digital Commons@Georgia Southern Electronic Theses & Dissertations Graduate Studies, Jack N. Averitt College of Spring 2013 Computational Analysis to Enhance Laminar Flow Convective
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 informationSimplified Model of WWER-440 Fuel Assembly for ThermoHydraulic Analysis
1 Portál pre odborné publikovanie ISSN 1338-0087 Simplified Model of WWER-440 Fuel Assembly for ThermoHydraulic Analysis Jakubec Jakub Elektrotechnika 13.02.2013 This work deals with thermo-hydraulic processes
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 informationMixing and Evaporation of Liquid Droplets Injected into an Air Stream Flowing at all Speeds
Mixing and Evaporation of Liquid Droplets Injected into an Air Stream Flowing at all Speeds F. Moukalled* and M. Darwish American University of Beirut Faculty of Engineering & Architecture Mechanical Engineering
More informationMODELLING OF MULTIPHASE FLOWS
MODELLING OF MULTIPHASE FLOWS FROM MICRO-SCALE TO MACRO-SCALE Department of Applied Mechanics, University of Technology, Gothenburg, Sweden. Siamuf Seminar October 2006 OUTLINE 1 GROUP PHILOSOPHY 2 PROJECTS
More informationCFD Analysis of Gas Cooling
As presented at: ILASS Americas, 20th Annual Conference on Liquid Atomization and Spray Systems, Chicago, IL, May 2007 J. S. Markus* Spraying Systems Deutschland GmbH Paul-Strähle Str. 10 73614 Schorndorf,
More informationANSYS Advanced Solutions for Gas Turbine Combustion. Gilles Eggenspieler 2011 ANSYS, Inc.
ANSYS Advanced Solutions for Gas Turbine Combustion Gilles Eggenspieler ANSYS, Inc. 1 Agenda Steady State: New and Existing Capabilities Reduced Order Combustion Models Finite-Rate Chemistry Models Chemistry
More informationFlerfasforskning vid Kemisk reaktionsteknik Chalmers. Bengt Andersson Love Håkansson Ronnie Andersson
Flerfasforskning vid Kemisk reaktionsteknik Chalmers Bengt Andersson Love Håkansson Ronnie Andersson Mass transfer in turbulent boundary layers y + ()3effTDDDDKy+=+=+ >99% is transported by turbulence
More informationExpress Introductory Training in ANSYS Fluent Lecture 2 Boundary Conditions & Solver Settings
Express Introductory Training in ANSYS Fluent Lecture 2 Boundary Conditions & Solver Settings Dimitrios Sofialidis Technical Manager, SimTec Ltd. Mechanical Engineer, PhD PRACE Autumn School 2013 - Industry
More information