Measuring microbubble clustering in turbulent flow
|
|
- Ross Elliott
- 5 years ago
- Views:
Transcription
1 Slide 1 Measuring microbubble clustering in turbulent flow Enrico Calzavarini University of Twente The Netherlands In collaboration with T. H van den Berg, S. Luther, F. Toschi, D. Lohse
2 Slide 2 Motivation Disperse multiphase turbulent flows - Modifications of the turbulent flow field spectra modification drag reduction - Characterization of preferential concentrations mixing or segregation
3 Physics of Fluid Group, University of Twente, The Netherlands. Slide 3 Microbubbles in Twente Water Channel ceramic plates (microbubble production) active grid (turbulence generation) hot-film (test section) Fluid: Uz= 0.22 m/s Reλ = 200 η = 10-4 m L 103 η Measurement section 2m 2m reservoir Flow direction elbow pump Bubbles: Radius = 100 µm ( η) Reb 1 gas fraction: 0 0.3% Experimental set-up details: Rensen, J. M., Luther, S. & Lohse, D. J. Fluid Mech. 538, (2005)
4 Effect of microbubbles on energy spectrum Slide 4 Dissipative spectra D(k)=2n k2 E(k) by hot-wire measurements single-phase 0.1% 0.3% our microbubble experiments Van den Berg, Luther and Lohse Energy spectra in microbubbly turbulence Phys. Fluids 18, (2006). E(k) ~ k -8/3 D(k) ~ k -2/3 Lance & Bataille (1991) Not observed for microbubbles!
5 Effect of microbubbles on energy spectrum Slide 5 Same features obtained in numerics (Eulerian-Lagrangian): Enhancement at small scales Reduction at large scales single-phase 0.1% 0.3% our numerics Mazzitelli, I., Lohse, D. & Toschi, F. (2003 ) The effect of microbubbles on developedturbulence. Phys. Fluids 15, L5. our microbubble experiments
6 Slide 6 Bubble clustering 1) Are microbubbles clustered in the flow? 2) How to characterize it? Statistical analysis of the experimental single-point hot-wire data 3) Is this again consistent with numerical simulations?
7 Slide 7 Bubble detection by hot-wire microbubbles do not break-up but bounce on the probe time derivative A typical signal hot wire size d b Temporal resolution
8 Slide 8 Our data set: Two samples: a) T tot = # bubbles Re λ = 206 void fraction b) T tot = Re λ = 180 Stokes = τ b / τ η 0.01 d b /η 0.5 From time to space domain via Taylor hypothesis:
9 Slide 9 Two statistical tests for bubble clustering
10 Slide 10 First statistical test: Pdf( r) Probability density function of distance intervals between bubbles For homogeneous bubbles: ρ= N b / ( T tot U) exponential distribution mean rate of bubbles per unit length For Δr L ( Pdf tail ) fit: Concentration factor:
11 Slide 11 Pdf( r) Log pdf(δr) exponential fit compensated plot Log pdf(δr) exponential fit (b) fit (a) C = 10% C = 19% - Re + Clustering increases with Re
12 Slide 12 Test against random sample Pdf( r) (b) (a) Exponential distribution, same time-length, same mean rate of experimental samples
13 Slide 13 Second statistical test: Coarse grained analysis of counted bubbles over a given space window Coarse grained central moments Scale dependent Kurtosis and Skewness For homogeneous (Poisson) statistics:
14 Slide 14 K(r) and S(r) K(r) (b) K(r) (a) 500 η - Re η Our spatial resolution: a) b) Deviation from Poisson statistics starts at r min up to 500 η
15 Slide 15 Numerical simulations Eulerian-Lagrangian DNS isotropic homogeneous turbulent flow one-way coupling a) Re λ = 95 b) Re λ = 91 N b =10 5, void fraction 2.5% St=0.1 d b /η 1 From flow visualization St=0.1 We use numerical single-point probes as in experiment
16 Slide 16 Pdf( r) (numerics) (b) (a) C = 29% C = 37% - Re + Clustering increases with Re
17 Slide 17 K(r) and S(r) (numerics) (b) (a) η - Re + η Deviation from Poisson statistics starts at η up to 50 η
18 Slide 18 Conclusions 1) Our single -point hot-wire experimental records of microbubbles in turbulence display clustering 2) Fraction of bubbles trapped ~ 10 % 3) Scale dependent deviation from Poisson distribution from η up to O(100η) 4) Clustering increase with Reynolds. 5) Similar qualitative features in DNS, although stronger concentrations observed. Microbubble clustering in turbulent flow, E. Calzavarini, T. H. van den Berg, S. Luther, F. Toschi and D. Lohse, preprint on Arxiv: physics/
Concentration and segregation of particles and bubbles by turbulence : a numerical investigation
Concentration and segregation of particles and bubbles by turbulence : a numerical investigation Enrico Calzavarini Physics of Fluids Group University of Twente The Netherlands with Massimo Cencini CNR-ISC
More informationarxiv: v2 [physics.flu-dyn] 26 Jan 2016
Under consideration for publication in J. Fluid Mech. 1 Energy spectra in turbulent bubbly flows arxiv:1307.6252v2 [physics.flu-dyn] 26 Jan 2016 Vivek N. Prakash 1,2, J. Martínez Mercado 1, Leen van Wijngaarden
More informationarxiv:physics/ v1 [physics.flu-dyn] 28 Feb 2003
Experimental Lagrangian Acceleration Probability Density Function Measurement arxiv:physics/0303003v1 [physics.flu-dyn] 28 Feb 2003 N. Mordant, A. M. Crawford and E. Bodenschatz Laboratory of Atomic and
More informationarxiv: v1 [physics.flu-dyn] 8 Jun 2017
This draft was prepared using the LaTeX style file belonging to the Journal of Fluid Mechanics arxiv:76.593v [physics.flu-dyn] 8 Jun 7 Experimental investigation of the turbulence induced by a bubble swarm
More informationThe behaviour of small inertial particles in homogeneous and isotropic turbulence
The behaviour of small inertial particles in homogeneous and isotropic turbulence Multiphase Turbulent Flows in the Atmosphere and Ocean, Boulder 2012 Alessandra S. Lanotte Institute for Atmospheric Science
More informationLocal flow structure and Reynolds number dependence of Lagrangian statistics in DNS of homogeneous turbulence. P. K. Yeung
Local flow structure and Reynolds number dependence of Lagrangian statistics in DNS of homogeneous turbulence P. K. Yeung Georgia Tech, USA; E-mail: pk.yeung@ae.gatech.edu B.L. Sawford (Monash, Australia);
More informationINTERACTION OF AN AIR-BUBBLE DISPERSED PHASE WITH AN INITIALLY ISOTROPIC TURBULENT FLOW FIELD
3rd Workshop on Transport Phenomena in Two-Phase Flow Nessebar, Bulgaria, 2-7 September 1998, p.p. 133-138 INTERACTION OF AN AIR-BUBBLE DISPERSED PHASE WITH AN INITIALLY ISOTROPIC TURBULENT FLOW FIELD
More informationPreferential concentration of inertial particles in turbulent flows. Jérémie Bec CNRS, Observatoire de la Côte d Azur, Université de Nice
Preferential concentration of inertial particles in turbulent flows Jérémie Bec CNRS, Observatoire de la Côte d Azur, Université de Nice EE250, Aussois, June 22, 2007 Particle laden flows Warm clouds Plankton
More informationThe effect of microbubbles on developed turbulence
Citation for published version (APA): Mazzitelli, I. M., Lohse, D., & Toschi, F. (2003).. Physics of Fluids, 15(1), L5-L8. DOI: 10.1063/1.1528619 DOI: 10.1063/1.1528619 Document status and date: Published:
More informationHigh-resolution simulation results of kinematic and dynamic collision statistics of cloud droplets
High-resolution simulation results of kinematic and dynamic collision statistics of cloud droplets Bogdan Rosa (bogdan.rosa@imgw.pl) Institute of Meteorology and Water Management National Research Institute
More informationLagrangian intermittency in drift-wave turbulence. Wouter Bos
Lagrangian intermittency in drift-wave turbulence Wouter Bos LMFA, Ecole Centrale de Lyon, Turbulence & Stability Team Acknowledgments Benjamin Kadoch, Kai Schneider, Laurent Chevillard, Julian Scott,
More informationInertial-Range Dynamics and Mixing: Isaac Newton Institute for Mathematical Sciences, Cambridge, UK, 29 September to 3 October 2008
Inertial-Range Dynamics and Mixing: Isaac Newton Institute for Mathematical Sciences, Cambridge, UK, 29 September to 3 October 2008 MIXING DUE TO RAYLEIGH-TAYLOR INSTABILITY David Youngs AWE Aldermaston
More informationarxiv: v1 [physics.flu-dyn] 24 Feb 2016
Preferential rotation of chiral dipoles in isotropic turbulence Stefan Kramel and Greg A. Voth Department of Physics, Wesleyan University, Middletown, Connecticut 6459, USA arxiv:6.74v [physics.flu-dyn]
More informationSpectral analysis of energy transfer in variable density, radiatively heated particle-laden flows
Center for Turbulence Research Proceedings of the Summer Program 24 27 Spectral analysis of energy transfer in variable density, radiatively heated particle-laden flows By H. Pouransari, H. Kolla, J. H.
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 informationTutorial School on Fluid Dynamics: Aspects of Turbulence Session I: Refresher Material Instructor: James Wallace
Tutorial School on Fluid Dynamics: Aspects of Turbulence Session I: Refresher Material Instructor: James Wallace Adapted from Publisher: John S. Wiley & Sons 2002 Center for Scientific Computation and
More informationMixing induced by a bubble swarm rising through incident turbulence
Mixing induced by a bubble swarm rising through incident turbulence As evident from the above discussion, there exists a wealth of experimental and numerical investigations on homogeneous bubble swarms
More informationAn Introduction to Theories of Turbulence. James Glimm Stony Brook University
An Introduction to Theories of Turbulence James Glimm Stony Brook University Topics not included (recent papers/theses, open for discussion during this visit) 1. Turbulent combustion 2. Turbulent mixing
More informationTurbulent Mixing of Passive Tracers on Small Scales in a Channel Flow
Turbulent Mixing of Passive Tracers on Small Scales in a Channel Flow Victor Steinberg Department of Physics of Complex Systems, The Weizmann Institute of Science, Israel In collaboration with Y. Jun,
More informationMy research activities
My research activities Gaetano Sardina Division day, 29 th August 218 Agenda Challenges with mul1phase flows Bubbles Droplets Par1cles Some new ideas/possible collabora1ons Challenges Mul1-physics: fluid
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 and Vijaya Rani PI: Sarma L. Rani Department of Mechanical and Aerospace
More informationDISPERSION IN ROTATING TURBULENCE the development of a 3D-PTV system
Lorentz Center - Leiden, August 23 rd 2006 DISPERSION IN ROTATING TURBULENCE the development of a 3D-PTV system, Herman Clercx, Ruben Trieling MOTIVATIONS AND GOALS Two main goals give reasons for this
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 informationDNS of the Taylor-Green vortex at Re=1600
DNS of the Taylor-Green vortex at Re=1600 Koen Hillewaert, Cenaero Corentin Carton de Wiart, NASA Ames koen.hillewaert@cenaero.be, corentin.carton@cenaero.be Introduction This problem is aimed at testing
More informationTurbulence Modeling I!
Outline! Turbulence Modeling I! Grétar Tryggvason! Spring 2010! Why turbulence modeling! Reynolds Averaged Numerical Simulations! Zero and One equation models! Two equations models! Model predictions!
More informationHomogeneous Rayleigh-Bénard convection
Slide 1 Homogeneous Rayleigh-Bénard convection scaling, heat transport and structures E. Calzavarini and F. Toschi, D. Lohse, R. Tripiccione, C. R. Doering, J. D. Gibbon, A. Tanabe Euromech Colloquium
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 informationFragmentation under the scaling symmetry and turbulent cascade with intermittency
Center for Turbulence Research Annual Research Briefs 23 197 Fragmentation under the scaling symmetry and turbulent cascade with intermittency By M. Gorokhovski 1. Motivation and objectives Fragmentation
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 informationMulti-Scale Modeling of Turbulence and Microphysics in Clouds. Steven K. Krueger University of Utah
Multi-Scale Modeling of Turbulence and Microphysics in Clouds Steven K. Krueger University of Utah 10,000 km Scales of Atmospheric Motion 1000 km 100 km 10 km 1 km 100 m 10 m 1 m 100 mm 10 mm 1 mm Planetary
More informationCollision of inertial particles in turbulent flows.
Collision of inertial particles in turbulent flows. Alain Pumir, INLN (France) Grisha Falkovich, Weizmann Inst. (Israel) Introduction (1) Particles advected by a fluid flow, with a mass that does not match
More informationTurbulent Flows. g u
.4 g u.3.2.1 t. 6 4 2 2 4 6 Figure 12.1: Effect of diffusion on PDF shape: solution to Eq. (12.29) for Dt =,.2,.2, 1. The dashed line is the Gaussian with the same mean () and variance (3) as the PDF at
More informationOptimizing calculation costs of tubulent flows with RANS/LES methods
Optimizing calculation costs of tubulent flows with RANS/LES methods Investigation in separated flows C. Friess, R. Manceau Dpt. Fluid Flow, Heat Transfer, Combustion Institute PPrime, CNRS University
More informationClustering and Lagrangian Statistics of Bubbles. Julián Martínez Mercado
Clustering and Lagrangian Statistics of Bubbles Julián Martínez Mercado Samenstelling promotiecommissie: Prof. dr. Gerard van der Steenhoven (voorzitter) Prof. dr. Detlef Lohse (promotor) dr. Chao Sun
More informationSmall particles in homogeneous turbulence: Settling velocity enhancement by two-way coupling
PHYSICS OF FLUIDS 18, 027102 2006 Small particles in homogeneous turbulence: Settling velocity enhancement by two-way coupling Thorsten Bosse a and Leonhard Kleiser Institute of Fluid Dynamics, ETH Zürich,
More informationMultiscale Computation of Isotropic Homogeneous Turbulent Flow
Multiscale Computation of Isotropic Homogeneous Turbulent Flow Tom Hou, Danping Yang, and Hongyu Ran Abstract. In this article we perform a systematic multi-scale analysis and computation for incompressible
More informationNote the diverse scales of eddy motion and self-similar appearance at different lengthscales of the turbulence in this water jet. Only eddies of size
L Note the diverse scales of eddy motion and self-similar appearance at different lengthscales of the turbulence in this water jet. Only eddies of size 0.01L or smaller are subject to substantial viscous
More informationLarge-eddy simulation of turbulent dispersed flows: a review of modelling approaches
Acta Mech DOI 1.17/s77-17-183-x REVIEW AND PERSPECTIVE IN MECHANICS Cristian Marchioli Large-eddy simulation of turbulent dispersed flows: a review of modelling approaches Received: 1 October 216 / Revised:
More informationIntroduction to Turbulence and Turbulence Modeling
Introduction to Turbulence and Turbulence Modeling Part I Venkat Raman The University of Texas at Austin Lecture notes based on the book Turbulent Flows by S. B. Pope Turbulent Flows Turbulent flows Commonly
More informationLagrangian acceleration in confined 2d turbulent flow
Lagrangian acceleration in confined 2d turbulent flow Kai Schneider 1 1 Benjamin Kadoch, Wouter Bos & Marie Farge 3 1 CMI, Université Aix-Marseille, France 2 LMFA, Ecole Centrale, Lyon, France 3 LMD, Ecole
More informationExperience 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 informationDimensionality influence on energy, enstrophy and passive scalar transport.
Dimensionality influence on energy, enstrophy and passive scalar transport. M. Iovieno, L. Ducasse, S. Di Savino, L. Gallana, D. Tordella 1 The advection of a passive substance by a turbulent flow is important
More informationReview of electron-scale current-layer dissipation in kinetic plasma turbulence
Meeting on Solar Wind Turbulence Kennebunkport, ME, June 4-7, 2013 Review of electron-scale current-layer dissipation in kinetic plasma turbulence Minping Wan University of Delaware W. H. Matthaeus, P.
More informationSmall-Scale Statistics and Structure of Turbulence in the Light of High Resolution Direct Numerical Simulation
1 Small-Scale Statistics and Structure of Turbulence in the Light of High Resolution Direct Numerical Simulation Yukio Kaneda and Koji Morishita 1.1 Introduction Fully developed turbulence is a phenomenon
More informationarxiv: v1 [physics.flu-dyn] 6 Apr 2011
arxiv:1104.1093v1 [physics.flu-dyn] 6 Apr 2011 Statistical properties of an ideal subgrid-scale correction for Lagrangian particle tracking in turbulent channel flow F. Bianco 1,2, S. Chibbaro 2, C. Marchioli
More informationNumerical analysis of a fully developed non-isothermal particle-laden turbulent channel flow
Arch. Mech., 3, 1, pp. 77 91, Warszawa 11 Numerical analysis of a fully developed non-isothermal particle-laden turbulent channel flow M. JASZCZUR Department of Fundamental Research in Energy Engineering
More informationThis is an author-deposited version published in: Handle ID:.http://hdl.handle.net/10985/8695
Science Arts & Métiers (SAM) is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited
More informationTurbulent Rotating Rayleigh-Bénard Convection: DNS and SPIV Measurements
Turbulent Rotating Rayleigh-Bénard Convection: DNS and SPIV Measurements Rudie Kunnen 1 Herman Clercx 1,2 Bernard Geurts 1,2 1 Fluid Dynamics Laboratory, Department of Physics Eindhoven University of Technology
More informationPublished in: Proceedings of the 5th European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010
The effect of phase transitions on the droplet size distribution in homogeneous isotropic turbulence Deb, B.S.; Ghazaryan, L.; Geurts, B.J.; Clercx, H.J.H.; Kuerten, J.G.M.; van der Geld, C.W.M. Published
More informationO. A Survey of Critical Experiments
O. A Survey of Critical Experiments 1 (A) Visualizations of Turbulent Flow Figure 1: Van Dyke, Album of Fluid Motion #152. Generation of turbulence by a grid. Smoke wires show a uniform laminar stream
More informationNonequilibrium Dynamics in Astrophysics and Material Science YITP, Kyoto
Nonequilibrium Dynamics in Astrophysics and Material Science 2011-11-02 @ YITP, Kyoto Multi-scale coherent structures and their role in the Richardson cascade of turbulence Susumu Goto (Okayama Univ.)
More informationProbability density function (PDF) methods 1,2 belong to the broader family of statistical approaches
Joint probability density function modeling of velocity and scalar in turbulence with unstructured grids arxiv:6.59v [physics.flu-dyn] Jun J. Bakosi, P. Franzese and Z. Boybeyi George Mason University,
More informationImplementation of a symmetry-preserving discretization in Gerris
Implementation of a symmetry-preserving discretization in Gerris Daniel Fuster Cols: Pierre Sagaut, Stephane Popinet Université Pierre et Marie Curie, Institut Jean Le Rond D Alembert Introduction 10/11:
More informationMax Planck Institut für Plasmaphysik
ASDEX Upgrade Max Planck Institut für Plasmaphysik 2D Fluid Turbulence Florian Merz Seminar on Turbulence, 08.09.05 2D turbulence? strictly speaking, there are no two-dimensional flows in nature approximately
More informationNumerical simulation of wave breaking in turbulent two-phase Couette flow
Center for Turbulence Research Annual Research Briefs 2012 171 Numerical simulation of wave breaking in turbulent two-phase Couette flow By D. Kim, A. Mani AND P. Moin 1. Motivation and objectives When
More informationIntermittent distribution of heavy particles in a turbulent flow. Abstract
Intermittent distribution of heavy particles in a turbulent flow Gregory Falkovich 1 and Alain Pumir 2 1 Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100 Israel 2 I.N.L.N., 1361
More informationarxiv: v2 [nlin.cd] 11 Sep 2009
Journal of Turbulence Vol. 00, No. 00, 2008, 1 11 Geometric properties of particle trajectories in turbulent flows arxiv:0901.3521v2 [nlin.cd] 11 Sep 2009 A. Scagliarini a Department of Physics, University
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 informationSettling of heated inertial particles through homogeneous turbulence
Center for Turbulence Research Proceedings of the Summer Program 4 5 Settling of heated inertial particles through homogeneous turbulence By A. Frankel, H. Pouransari, F. Coletti AND A. Mani Particle-laden
More informationAn evaluation of a conservative fourth order DNS code in turbulent channel flow
Center for Turbulence Research Annual Research Briefs 2 2 An evaluation of a conservative fourth order DNS code in turbulent channel flow By Jessica Gullbrand. Motivation and objectives Direct numerical
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 informationEffect of particle shape on fluid statistics and particle dynamics in turbulent pipe flow
Eur. Phys. J. E (2018) 41: 116 DOI 10.1140/epje/i2018-11724-6 Regular Article THE EUROPEAN PHYSICAL JOURNAL E Effect of particle shape on fluid statistics and particle dynamics in turbulent pipe flow A.
More informationTurbulent transport of finite sized material particles
Home Search Collections Journals About Contact us My IOPscience Turbulent transport of finite sized material particles This article has been downloaded from IOPscience. Please scroll down to see the full
More informationLecture 2. Turbulent Flow
Lecture 2. Turbulent Flow Note the diverse scales of eddy motion and self-similar appearance at different lengthscales of this turbulent water jet. If L is the size of the largest eddies, only very small
More informationCVS filtering to study turbulent mixing
CVS filtering to study turbulent mixing Marie Farge, LMD-CNRS, ENS, Paris Kai Schneider, CMI, Université de Provence, Marseille Carsten Beta, LMD-CNRS, ENS, Paris Jori Ruppert-Felsot, LMD-CNRS, ENS, Paris
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 informationThe dispersion of a light solid particle in high-reynolds number homogeneous stationary turbulence: LES approach with stochastic sub-grid model
Computational Methods in Multiphase Flow III 65 The dispersion of a light solid particle in high-reynolds number homogeneous stationary turbulence: ES approach with stochastic sub-grid model M. Gorokhoski
More informationAER1310: TURBULENCE MODELLING 1. Introduction to Turbulent Flows C. P. T. Groth c Oxford Dictionary: disturbance, commotion, varying irregularly
1. Introduction to Turbulent Flows Coverage of this section: Definition of Turbulence Features of Turbulent Flows Numerical Modelling Challenges History of Turbulence Modelling 1 1.1 Definition of Turbulence
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 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 informationWhat s important: viscosity Poiseuille's law Stokes' law Demo: dissipation in flow through a tube
PHYS 101 Lecture 29x - Viscosity 29x - 1 Lecture 29x Viscosity (extended version) What s important: viscosity Poiseuille's law Stokes' law Demo: dissipation in flow through a tube Viscosity We introduced
More informationCharacteristics of Linearly-Forced Scalar Mixing in Homogeneous, Isotropic Turbulence
Seventh International Conference on Computational Fluid Dynamics (ICCFD7), Big Island, Hawaii, July 9-13, 2012 ICCFD7-1103 Characteristics of Linearly-Forced Scalar Mixing in Homogeneous, Isotropic Turbulence
More informationIMAGE-BASED MODELING OF THE SKIN-FRICTION COEFFICIENT IN COMPRESSIBLE BOUNDARY-LAYER TRANSITION
IMAGE-BASED MODELING OF THE SKIN-FRICTION COEFFICIENT IN COMPRESSIBLE BOUNDARY-LAYER TRANSITION Wenjie Zheng State Key Laboratory of Turbulence and Complex Systems College of Engineering, Peking University
More informationBand-pass filtered velocity statistics in decaying turbulent box
THEORETICAL & APPLIED MECHANICS LETTERS 1, 042002 (2011) Band-pass filtered velocity statistics in decaying turbulent box J. M. Lenoir, S. Simoëns, a) and Jean-Noel Gence UMR CNRS 5509,LMFA, ECL, UCB LyonI,
More informationThe Johns Hopkins Turbulence Databases (JHTDB)
The Johns Hopkins Turbulence Databases (JHTDB) HOMOGENEOUS BUOYANCY DRIVEN TURBULENCE DATA SET Data provenance: D. Livescu 1 Database Ingest and Web Services: C. Canada 1, K. Kalin 2, R. Burns 2 & IDIES
More informationSettling of finite-size particles in an ambient fluid: A Numerical Study
Settling of finite-size particles in an ambient fluid: A Numerical Study Todor Doychev 1, Markus Uhlmann 1 1 Institute for Hydromechanics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany Keywords:
More informationNUMERICAL SIMULATION OF THREE DIMENSIONAL GAS-PARTICLE FLOW IN A SPIRAL CYCLONE
Applied Mathematics and Mechanics (English Edition), 2006, 27(2):247 253 c Editorial Committee of Appl. Math. Mech., ISSN 0253-4827 NUMERICAL SIMULATION OF THREE DIMENSIONAL GAS-PARTICLE FLOW IN A SPIRAL
More informationStatistical studies of turbulent flows: self-similarity, intermittency, and structure visualization
Statistical studies of turbulent flows: self-similarity, intermittency, and structure visualization P.D. Mininni Departamento de Física, FCEyN, UBA and CONICET, Argentina and National Center for Atmospheric
More informationProblem C3.5 Direct Numerical Simulation of the Taylor-Green Vortex at Re = 1600
Problem C3.5 Direct Numerical Simulation of the Taylor-Green Vortex at Re = 6 Overview This problem is aimed at testing the accuracy and the performance of high-order methods on the direct numerical simulation
More informationBasic Features of the Fluid Dynamics Simulation Software FrontFlow/Blue
11 Basic Features of the Fluid Dynamics Simulation Software FrontFlow/Blue Yang GUO*, Chisachi KATO** and Yoshinobu YAMADE*** 1 FrontFlow/Blue 1) is a general-purpose finite element program that calculates
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 informationLagrangian particle statistics in turbulent flows from a simple vortex model
PHYSICAL REVIEW E 77, 05630 2008 Lagrangian particle statistics in turbulent flows from a simple vortex model M. Wilczek,, * F. Jenko, 2 and R. Friedrich Institute for Theoretical Physics, University of
More informationGeotropic tracers in turbulent flows: a proxy for fluid acceleration
Journal of Turbulence, 2013 Vol. 14, No. 7, 24 33, http://dx.doi.org/10.1080/14685248.2013.832832 Geotropic tracers in turbulent flows: a proxy for fluid acceleration F. De Lillo a,m.cencini b, G. Boffetta
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 informationS.Di Savino, M.Iovieno, L.Ducasse, D.Tordella. EPDFC2011, August Politecnico di Torino, Dipartimento di Ingegneria Aeronautica e Spaziale
Mean Dimensionality S.Di Savino, M.Iovieno, L.Ducasse, D.Tordella Politecnico di Torino, Dipartimento di Ingegneria Aeronautica e Spaziale EPDFC2, August 2 Passive Basic phenomenology Mean A passive is
More information(Toward) A Solution to the Hydrostatic Mass Bias Problem in Galaxy Clusters. Eiichiro Komatsu (MPA) UTAP Seminar, December 22, 2014
(Toward) A Solution to the Hydrostatic Mass Bias Problem in Galaxy Clusters Eiichiro Komatsu (MPA) UTAP Seminar, December 22, 2014 References Shi & EK, MNRAS, 442, 512 (2014) Shi, EK, Nelson & Nagai, arxiv:1408.3832
More informationTable of Contents. Foreword... xiii. Preface... xv
Table of Contents Foreword.... xiii Preface... xv Chapter 1. Fundamental Equations, Dimensionless Numbers... 1 1.1. Fundamental equations... 1 1.1.1. Local equations... 1 1.1.2. Integral conservation equations...
More informationAnalysis of Turbulent Free Convection in a Rectangular Rayleigh-Bénard Cell
Proceedings of the 8 th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows Lyon, July 2007 Paper reference : ISAIF8-00130 Analysis of Turbulent Free Convection
More informationLinearly forced isotropic turbulence
Center for Turbulence Research Annual Research Briefs 23 461 Linearly forced isotropic turbulence By T. S. Lundgren Stationary isotropic turbulence is often studied numerically by adding a forcing term
More informationTurbulence modulation by fully resolved particles using Immersed Boundary Methods
Turbulence modulation by fully resolved particles using Immersed Boundary Methods Abouelmagd Abdelsamie and Dominique Thévenin Lab. of Fluid Dynamics & Technical Flows University of Magdeburg Otto von
More informationThe Truth about diffusion (in liquids)
The Truth about diffusion (in liquids) Aleksandar Donev Courant Institute, New York University & Eric Vanden-Eijnden, Courant In honor of Berni Julian Alder LLNL, August 20th 2015 A. Donev (CIMS) Diffusion
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 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 informationAcceleration statistics of inertial particles in turbulent flow
Eur. Phys. J. B 66, 531 536 (2008) DOI: 10.1140/epjb/e2008-00460-x Acceleration statistics of inertial particles in turbulent flow N.M. Qureshi, U. Arrieta, C. Baudet, A. Cartellier, Y. Gagne and M. Bourgoin
More informationarxiv: v1 [physics.flu-dyn] 1 Dec 2016
Clustering and preferential concentration of finite-size particles in forced homogeneous-isotropic turbulence Markus Uhlmann and Agathe Chouippe arxiv:1612.00318v1 [physics.flu-dyn] 1 Dec 2016 Institute
More informationControl of a Particle-Laden Jet Using a Piezo-electric Actuator
Control of a Particle-Laden Jet Using a Piezo-electric Actuator by Stamatios Pothos and Ellen K. Longmire 2 TSI Incorporated, P.O. BOX 6424, St. Paul, MN 5564 2 Department of Aerospace Engineering & Mechanics,
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 informationP2.1 Scalar spectra in the near-dissipation range derived from structure functions
P2. Scalar spectra in the near-dissipation range derived from structure functions A.F. Moene and A. van Dijk,2 Meteorology and Air Quality Group, Wageningen University, The Netherlands 2 Alterra, Wageningen
More informationParticle removal in linear shear flow: model prediction and experimental validation
Particle removal in linear shear flow: model prediction and experimental validation M.L. Zoeteweij, J.C.J. van der Donck and R. Versluis TNO Science and Industry, P.O. Box 155, 600 AD Delft, The Netherlands
More informationUsing DNS to Understand Aerosol Dynamics
APS Division of Fluid Dynamics Meeting East Rutherford, NJ November 23-25, 2003 Using DNS to Understand Aerosol Dynamics Lance R. Collins Sibley School of Mechanical & Aerospace Engineering Cornell University
More information