Omid Ejtehadi Ehsan Roohi, Javad Abolfazli Esfahani. Department of Mechanical Engineering Ferdowsi university of Mashhad, Iran
|
|
- Trevor Byrd
- 5 years ago
- Views:
Transcription
1 Omid Ejtehadi Ehsan Roohi, Javad Abolfazli Esfahani Department of Mechanical Engineering Ferdowsi university of Mashhad, Iran
2 Overview Micro/Nano Couette Flow DSMC Algorithm Code Validation Entropy and Entropy Generation Results Compressibility Effects Rarefaction Effects Conclusion
3 Micro-Fluidic Systems Micro-Channel Micro-Turbine Micro-Pump Micro-Motor Micro-Nozzle Micro-Valve
4 Micro-Fluidic Systems Thermal ink-jet operation Micro-Propulsion System Micro-Beam
5 Flow Regimes Knudsen Number = Mean Free Path System Length Molecular Models Boltzmann Equation (BE) / DSMC Collisionless BE / DSMC Continuum Models Euler Equations Navier-Stokes Equations Burnett Equations Kn MEMS NANO Continuum Regime Slip-Flow Regime Transition Regime Free Molecular Regime
6 Micro-Fluidics: Governing Equation Boltzmann Equation: temporal-spatial changes of number of molecules in a velocity class c t Local rate of change of number of molecules 4 2 * * ( nf ) c. ( nf ) F. ( nf ) n ( f f1 ff1) cr d dc1 r c 0 Influx of molecules due to Influx of molecules due to external force Binary Collision term convection Assumptions i) Dilute Gas: Binary Collision ii) Molecular Chaos: colliding particles are uncorrelated
7 DSMC Algorithm -Developed by Bird (1960 s) Initialize system with particles Loop over time steps Create particles at open boundaries Move all the particles Cell size < λ, time step < 1/ν Process any interactions of particle & boundaries Sort particles into cells Sample statistical values Select and execute random collisions Slide taken from Alejandro L. Garcia, Department of Physics, San Jose State University
8 DSMC Applications Hypersonic Flight at High Altitudes Vacuum Technology Micro/nano Scale Devices
9 Micro/Nano Couette Flow Platter Micro-Bearing A Hard Disk Drive and its Schematic Schematic of the Planar Couette flow
10 Convergence Check Problem is essentially 1-D, periodic BC s on the sides At least 300 particles per each cell Heat transfer coefficient Temperature
11 Grid Independency Study
12 Code Validation Kn= 0.01 Mw= 0.16 Kn= 0.1 Mw= 0.16 Current Gu-Emerson DSMC NS Analytical
13 Entropy Tendency of a process to proceed in a particular direction Proceeding from order into disorder (randomness ) Boltzmann Relation the number of possible microstates in the system In DSMC: Sorting particles to achieve velocity distribution function f and integrating the resulting distribution
14 Entropy Generation Irreversibilities Quantifying Non-equilibrium Optimum Design Positive Definite Naterer and Camberos Equilibrium Based Definition Myong Formula
15 Entropy: Compressibility Effects Mach Mach Similar trends in entropy and temperature profiles T depends on variance of velocity In probability theory, the variance is a measure of how far a set of numbers is spread out (Wikipedia) Increase of Mach number results in increase of entropy (disorder) in the domain
16 Entropy Generation: Compressibility effects Similar trends in density and entropy generation shows this parameter can be used for quantifying non-equilibrium Increase of Mach number results in increase of entropy generation Also as Mach increases entropy profiles become non-uniform
17 Entropy Generation: Different Approaches
18 Role of Entropy Flux
19 Entropy Generation: Compressibility Effects Viscous Thermal Generation of entropy is mainly due to viscous dissipation
20 Entropy: Rarefaction Effects Similarities between entropy and temperature profiles
21 Entropy Generation: Rarefaction effects In a more rarefied flow less entropy is generated
22 Entropy Generation: Rarefaction Effects Viscous Thermal Generation of entropy is mainly due to viscous dissipation
23 Concluding Remarks Increase of wall Mach number results in non-uniform entropy profiles Entropy and temperature profiles are following an identical trend Increase of Knudsen number results in more uniform entropy profiles Entropy generation can be properly applied in quantifying non-equilibrium phenomena In the micro-couette flow the generation of entropy is mainly due to viscous dissipation term
24 Thanks
DSMC Modeling of Rarefied Flow through Micro/Nano Backward-Facing Steps
DSMC Modeling of Rarefied Flow through Micro/Nano Backward-Facing Steps Amir-Mehran Mahdavi 1, Ehsan Roohi 2 1,2- Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi university of Mashhad,
More informationStefan Stefanov Bulgarian Academy of Science, Bulgaria Ali Amiri-Jaghargh Ehsan Roohi Hamid Niazmand Ferdowsi University of Mashhad, Iran
Stefan Stefanov Bulgarian Academy of Science, Bulgaria Ali Amiri-Jaghargh Ehsan Roohi Hamid Niazmand Ferdowsi University of Mashhad, Iran Outlines: Introduction DSMC Collision Schemes Results Conclusion
More informationDetailed investigation of hydrodynamics and thermal behavior of nano/micro shear driven ow using DSMC
Scientia Iranica B (2013) 20(4), 1228{1240 Sharif University of Technology Scientia Iranica Transactions B: Mechanical Engineering www.scientiairanica.com Detailed investigation of hydrodynamics and thermal
More informationScaling Parameters in Rarefied Flow and the Breakdown of the Navier-Stokes Equations Mechanical Engineering Research Report No: 2004/09
Scaling Parameters in Rarefied Flow and the Breakdown of the Navier-Stokes Equations Mechanical Engineering Research Report No: 2004/09 Michael Macrossan, Centre for Hypersonics, University of Queensland
More informationAmir-Mehran Mahdavi 1, Nam T.P. Le 1, Ehsan Roohi 1,*, Craig White 2
Thermal rarefied gas flow investigations through micro/nano backward-facing step: Comparison of DSMC and CFD subject to hybrid slip and jump boundary conditions Amir-Mehran Mahdavi 1, Nam T.P. Le 1, Ehsan
More informationThe deposition efficiency and spatial thickness distribution of films created by Directed
Chapter 8 Vapor Transport Model Development The deposition efficiency and spatial thickness distribution of films created by Directed Vapor Deposition synthesis have been shown to be sensitive functions
More informationSurprising i Hydrodynamic d Results Discovered by means of Direct Simulation Monte Carlo
Surprising i Hydrodynamic d Results Discovered by means of Direct Simulation Monte Carlo Alejandro L. Garcia San Jose State University Lawrence Berkeley Nat. Lab. RTO-AVT-VKI Lecture Series, January 24
More informationDirect Modeling for Computational Fluid Dynamics
Direct Modeling for Computational Fluid Dynamics Kun Xu February 20, 2013 Computational fluid dynamics (CFD) is new emerging scientific discipline, and targets to simulate fluid motion in different scales.
More informationPredicting Breakdown of the Continuum Equations Under Rarefied Flow Conditions
Predicting Breakdown of the Continuum Equations Under Rarefied Flow Conditions Iain D. Boyd Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109 Abstract. The breakdown of the
More informationA Unified Gas-kinetic Scheme for Continuum and Rarefied Flows
A Unified Gas-kinetic Scheme for Continuum and Rarefied Flows K. Xu and J.C. Huang Mathematics Department, Hong Kong University of Science and Technology, Hong Kong Department of Merchant Marine, National
More informationLecture 6 Gas Kinetic Theory and Boltzmann Equation
GIAN Course on Rarefied & Microscale Gases and Viscoelastic Fluids: a Unified Framework Lecture 6 Gas Kinetic Theory and Boltzmann Equation Feb. 23 rd ~ March 2 nd, 2017 R. S. Myong Gyeongsang National
More informationSIMULATION OF COMPRESSIBLE GAS FLOW IN A MICRONOZZLE Effect of Walls on Shock Structure
AIAA - 2001-3073 SIMULATION OF COMPRESSIBLE GAS FLOW IN A MICRONOZZLE Effect of Walls on Shock Structure By M. Buoni, D. Dietz, K. Aslam, and V. V. Subramaniam Center for Advanced Plasma Engineering Non-Equilibrium
More informationSubsonic choked flow in the microchannel
PHYSICS OF FLUIDS 18, 127104 2006 Subsonic choked flow in the microchannel Xie Chong a Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics of the Chinese Academy of Sciences, 15 West
More informationNavier Stokes Solvers. Length (Log meters) Particle Methods. Density (Log n/n 0. Knudsen number =1/10 2. Dense Gas
Mesh and Algorithm Reænement Alejandro L. Garcia Center for Comp. Sciences and Engineering Lawrence Berkeley National Laboratory and Dept. Physics, San Jose State University Collaborators: Berni Alder
More informationTRANSIENT VELOCITY AND STEADY STATE ENTROPY GENERATION IN A MICROFLUIDIC COUETTE FLOW CONTAINING CHARGED NANO PARTICLES
Int. J. of Applied Mechanics and Engineering, 015, vol.0, No.4, pp.787-804 DOI: 10.1515/ijame-015-0051 TRANSIENT VELOCITY AND STEADY STATE ENTROPY GENERATION IN A MICROFLIDIC COETTE FLOW CONTAINING CHARGED
More informationTHE design of hypersonic vehicles requires accurate prediction
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Vol. 22, No. 1, January March 2008 Velocity Slip and Temperature Jump in Hypersonic Aerothermodynamics Andrew J. Lofthouse, Leonardo C. Scalabrin, and Iain D.
More informationMicro-Scale Gas Transport Modeling
Micro-Scale Gas Transport Modeling Continuum & Slip Flow Regimes: Navier-Stokes Equations Slip Boundary Conditions U g U w = ( σ ) σ U Kn n Slip, Transitional & Free Molecular: Direct Simulation Monte
More informationMIGRATE Summer School - June 27-28, 2016 University of Strasbourg
MIGRATE Summer School - June 27-28, 2016 University of Strasbourg DAY 1 - June 27 th, 2016 9:00 Introduction to the 1 st MIGRATE Summer School Industrial and Application aspects: I&A Session 9:30 Lessons
More informationNUMERICAL MODELING OF THE GAS-PARTICLE FLUID FLOW AND HEAT TRANSFER IN THE SLIP REGIME
Proceedings of the Asian Conference on Thermal Sciences 2017, 1st ACTS March 26-30, 2017, Jeju Island, Korea ACTS-P00394 NUMERICAL MODELING OF THE GAS-PARTICLE FLUID FLOW AND HEAT TRANSFER IN THE SLIP
More informationKinetic Effects in Spherical Expanding Flows of Binary-Gas Mixtures
Kinetic Effects in Spherical Expanding Flows of Binary-Gas Mixtures Vladimir V. Riabov Rivier College, Nashua, New Hampshire, USA Abstract. Diffusion effects in the spherical expanding flows of argon-helium
More informationThree-dimensional simulation of slip-flow and heat transfer in a microchannel using the lattice Boltzmann method
75 Three-dimensional simulation of slip-flow and heat transfer in a microchannel using the lattice Boltzmann method A. C. M. Sousa,2, M. Hadavand & A. Nabovati 3 Department of Mechanical Engineering, University
More informationApplication of a Modular Particle-Continuum Method to Partially Rarefied, Hypersonic Flows
Application of a Modular Particle-Continuum Method to Partially Rarefied, Hypersonic Flows Timothy R. Deschenes and Iain D. Boyd Department of Aerospace Engineering, University of Michigan, Ann Arbor,
More informationA wall-function approach to incorporating Knudsen-layer effects in gas micro flow simulations
A wall-function approach to incorporating Knudsen-layer effects in gas micro flow simulations D. A. Lockerby 1, J. M. Reese 2 and M. A. Gallis 3 1 Department of Mechanical Engineering, King s College London,
More informationHigh Altitude Rocket Plume and Thermal Radiation Analysis
High Altitude Rocket Plume and Thermal Radiation Analysis [ Woo Jin Jeon, Seung Wook Baek, Jae Hyun Park and Dong Sung Ha ] Abstract In this study, rocket plume behavior at various altitudes and radiative
More informationA NAVIER-STOKES MODEL INCORPORATING THE EFFECTS OF NEAR- WALL MOLECULAR COLLISIONS WITH APPLICATIONS TO MICRO GAS FLOWS
Arlemark, E.J. and Dadzie, S.K. and Reese, J.M. (2008) A Navier-Stokes model incorporating the effects of near-wall molecular collisions with applications to micro gas flows. In: 1st European Conference
More informationWP8: Parallel algorithms and GRID applications for computer modeling of processes and phenomena in Micro-Electro-Mechanical Systems (MEMS). 1.
WP8: Parallel algorithms and GRID applications for computer modeling of processes and phenomena in Micro-Electro-Mechanical Systems (MEMS). 1. Major Activities and Results Task 8.1: Computer Simulation
More informationRAREFACTION EFFECT ON FLUID FLOW THROUGH MICROCHANNEL
ISSN (Online) : 2319-8753 ISSN (Print) : 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology An ISO 3297: 2007 Certified Organization, Volume 2, Special Issue
More informationNon-Equilibrium Flow Modeling Using High- Order Schemes for the Boltzmann Model Equations
Purdue University Purdue e-pubs School of Aeronautics and Astronautics Faculty Publications School of Aeronautics and Astronautics 28 Non-Equilibrium Flow Modeling Using High- Order Schemes for the Boltzmann
More informationSimulation of Rarefied Gas Flow in Slip and Transitional Regimes by the Lattice Boltzmann Method
www.cfdl.issres.net Vol. 2 (2) June 2010 Simulation of Rarefied Gas Flow in Slip and Transitional Regimes by the Lattice Boltzmann Method N. Azwadi C. Sidik 1C, N.C. Horng 1, M.A. Mussa 2, and S. Abdullah
More informationBehaviour of microscale gas flows based on a power-law free path distribution function
Behaviour of microscale gas flows based on a power-law free path distribution function Nishanth Dongari, Yonghao Zhang and Jason M Reese Department of Mechanical Engineering, University of Strathclyde,
More information19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, -7 SEPTEMBER 007 INVESTIGATION OF AMPLITUDE DEPENDENCE ON NONLINEAR ACOUSTICS USING THE DIRECT SIMULATION MONTE CARLO METHOD PACS: 43.5.Ed Hanford, Amanda
More informationOn the Expedient Solution of the Boltzmann Equation by Modified Time Relaxed Monte Carlo (MTRMC) Method
Journal of Applied Fluid Mechanics, Vol. 11, No. 3, pp. 655-666, 2018. Available online at www.jafmonline.net, ISSN 1735-3572, EISSN 1735-3645. DOI: 10.18869/acadpub.jafm.73.246.28007 On the Expedient
More informationDSMC solver for an optimized Space Crew reentry Orbital Vehicle
DSMC solver for an optimized Space Crew reentry Orbital Vehicle Vigneshwaran Krishnamurthy 1,a, Ram Arvinth Shanmugam Periasamy 1,b, Vertika Saxena 1,c, Nandita Nurani Hari 1,d and Suriyaprabha Chandrasekar
More informationKinetic Models and Gas-Kinetic Schemes with Rotational Degrees of Freedom for Hybrid Continuum/Kinetic Boltzmann Methods
Kinetic Models and Gas-Kinetic Schemes with Rotational Degrees of Freedom for Hybrid Continuum/Kinetic Boltzmann Methods Simone Colonia, René Steijl and George N. Barakos CFD Laboratory - School of Engineering
More informationDSMC-Based Shear-Stress/Velocity-Slip Boundary Condition for Navier-Stokes Couette-Flow Simulations
DSMC-Based Shear-Stress/Velocity-Slip Boundary Condition for Navier-Stokes Couette-Flow Simulations J. R. Torczynski and M. A. Gallis Engineering Sciences Center, Sandia National Laboratories, P. O. Box
More informationApplication of the Transition Probability Matrix Method to High Knudsen Number Flow Past a Micro-Plate
Application of the Transition Probability Matrix Method to High Knudsen Number Flow Past a Micro-Plate Andrew J. Christlieb, W. Nicholas G. Hitchon, Quanhua Sun and Iain D. Boyd Department of Aerospace
More informationChapter 1 Direct Modeling for Computational Fluid Dynamics
Chapter 1 Direct Modeling for Computational Fluid Dynamics Computational fluid dynamics (CFD) is a scientific discipline, which aims to capture fluid motion in a discretized space. The description of the
More informationGridless DSMC. Spencer Olson. University of Michigan Naval Research Laboratory Now at: Air Force Research Laboratory
Gridless DSMC Spencer Olson University of Michigan Naval Research Laboratory Now at: Air Force Research Laboratory Collaborator: Andrew Christlieb, Michigan State University 8 June 2007 30 June 2009 J
More informationTAU Extensions for High Enthalpy Flows. Sebastian Karl AS-RF
TAU Extensions for High Enthalpy Flows Sebastian Karl AS-RF Contents Motivation Extensions available in the current release: Numerical schemes for super- and hypersonic flow fields Models for gas mixtures,
More informationMODELLING OF THE BOUNDARY CONDITION FOR MICRO CHANNELS WITH USING LATTICE BOLTZMANN METHOD (LBM)
Reports Awarded with "Best Paper" Crystal Prize 17 FRI-1.417-1-MEMBT-05 MODELLING OF THE BOUNDARY CONDITION FOR MICRO CHANNELS WITH USING LATTICE BOLTZMANN METHOD (LBM) Rsc. Asst. İlkay Çolpan, BSc Department
More informationFluid dynamics for a vapor-gas mixture derived from kinetic theory
IPAM Workshop II The Boltzmann Equation: DiPerna-Lions Plus 20 Years (IPAM-UCLA, April 15-17, 2009) Fluid dynamics for a vapor-gas mixture derived from kinetic theory Kazuo Aoki Department of Mechanical
More informationOscillatory shear-driven gas flows in the transition and free-molecular-flow regimes
PHYSICS OF FLUIDS 17, 100611 005 Oscillatory shear-driven gas flows in the transition and free-molecular-flow regimes Nicolas G. Hadjiconstantinou Department of Mechanical Engineering, Massachusetts Institute
More informationAtmospheric Entry. Technology, Mathematical Model and Simulation
Atmospheric Entry Technology, Mathematical Model and Simulation Julian Köllermeier RWTH Aachen, August 26th 2016 Outline 1. Introduction to Atmospheric Reentry 2. Rarefied Gases: From Science Fiction to
More informationWhy Should We Be Interested in Hydrodynamics?
Why Should We Be Interested in Hydrodynamics? Li-Shi Luo Department of Mathematics and Statistics Center for Computational Sciences Old Dominion University, Norfolk, Virginia 23529, USA Email: lluo@odu.edu
More informationNumerical studies of hypersonic binary gas-mixture flows near a sphere
Numerical studies of hypersonic binary gas-mixture flows near a sphere V.V. Riabov Diffusive Effects in Binary Gas-Mixture Flows near a Sphere Diffusion processes have a significant effect on the structure
More informationVelocity Slip and Temperature Jump in Hypersonic Aerothermodynamics
5th AIAA Aerospace Sciences Meeting and Exhibit - January 7, Reno, Nevada AIAA 7- Velocity Slip and Temperature Jump in Hypersonic Aerothermodynamics Andrew J. Lofthouse, Leonard C. Scalabrin and Iain
More informationNumerical Simulations of High Knudsen Number Gas Flows and. Microchannel Electrokinetic Liquid Flows. A Thesis. Submitted to the Faculty
Numerical Simulations of High Knudsen Number Gas Flows and Microchannel Electrokinetic Liquid Flows A Thesis Submitted to the Faculty of Drexel University by Fang Yan in partial fulfillment of the requirements
More information1 Continuum Models Some History and Background Added Value of Continuum Equations... 6
Re g u la riz a tio n o f Gra d s 1 3 -Mo m e nt-equ a tio n s in K in e tic Ga s Th e o ry Manuel Torrilhon Department of Mathematics & Center for Computational Engineering Science RWTH Aachen University
More informationDiffusion and Adsorption in porous media. Ali Ahmadpour Chemical Eng. Dept. Ferdowsi University of Mashhad
Diffusion and Adsorption in porous media Ali Ahmadpour Chemical Eng. Dept. Ferdowsi University of Mashhad Contents Introduction Devices used to Measure Diffusion in Porous Solids Modes of transport in
More informationThe velocity boundary condition at solid walls in rarefied gas simulations. Abstract
APS/123-QED The velocity boundary condition at solid walls in rarefied gas simulations Duncan A. Lockerby Department of Mechanical Engineering, King s College London, London WC2R 2LS, UK Jason M. Reese
More informationResearch of Micro-Rectangular-Channel Flow Based on Lattice Boltzmann Method
Research Journal of Applied Sciences, Engineering and Technology 6(14): 50-55, 013 ISSN: 040-7459; e-issn: 040-7467 Maxwell Scientific Organization, 013 Submitted: November 08, 01 Accepted: December 8,
More informationOn the expedient solution of the Boltzmann equation by Modified Time Relaxed Monte Carlo (MTRMC) method
On the expedient solution of the Boltzmann equation by Modified Time Relaxed Monte Carlo (M) method M. Eskandari 1 and S.S. Nourazar 1 Department of Mechanical Engineering, Amirkabir University of Technology,
More informationPlanar Laser-Induced Iodine Fluorescence Technique for Flow Visualization and Quantitative Measurements in Rarefied Flows
Planar Laser-Induced Iodine Fluorescence Technique for Flow Visualization and Quantitative Measurements in Rarefied Flows Professor James McDaniel*, Eric Cecil*, Erin Reed* and Josh Codoni* Professor Iain
More informationNumerical Simulation of Microwave Plasma Thruster Flow
Numerical Simulation of Microwave Plasma Thruster Flow IEPC-2007-211 Presented at the 30 th International Electric Propulsion Conference, Florence, Italy September 17-20, 2007 Mao-lin Chen *, Mao Gen-wang,
More informationIntroduction to Aerodynamics. Dr. Guven Aerospace Engineer (P.hD)
Introduction to Aerodynamics Dr. Guven Aerospace Engineer (P.hD) Aerodynamic Forces All aerodynamic forces are generated wither through pressure distribution or a shear stress distribution on a body. The
More informationEffective Boundary Conditions for Continuum Method of Investigation of Rarefied Gas Flow over Blunt Body
Effective Boundary Conditions for Continuum Method of Investigation of Rarefied Gas Flow over Blunt Body I.G. Brykina a, B.V. Rogov b, I.L. Semenov c, and G.A. Tirskiy a a Institute of Mechanics, Moscow
More informationFluid Equations for Rarefied Gases
1 Fluid Equations for Rarefied Gases Jean-Luc Thiffeault Department of Applied Physics and Applied Mathematics Columbia University http://plasma.ap.columbia.edu/~jeanluc 23 March 2001 with E. A. Spiegel
More informationFluid Mechanics Theory I
Fluid Mechanics Theory I Last Class: 1. Introduction 2. MicroTAS or Lab on a Chip 3. Microfluidics Length Scale 4. Fundamentals 5. Different Aspects of Microfluidcs Today s Contents: 1. Introduction to
More informationDSMC simulation of the gas flow through a bend and a short microchannel
Journal of Physics: Conference Series DSMC simulation of the gas flow through a bend and a short microchannel To cite this article: N K Kulakarni and S K Stefanov 2012 J. Phys.: Conf. Ser. 362 012014 View
More informationSpring_#1. Thermodynamics. Youngsuk Nam.
Spring_#1 Thermodynamics Youngsuk Nam ysnam1@khu.ac.kr Chapter 1: Objectives Understand the importance of thermodynamics Identify the unique vocabulary associated with thermodynamics through the precise
More informationSummary We develop an unconditionally stable explicit particle CFD scheme: Boltzmann Particle Hydrodynamics (BPH)
Summary Steps in BPH Space is divided into Cartesian cells Finite number of particles ~10 6-10 7 Particles fly freely between t n and t n+1 Mass, momentum and total energy are conserved Relax into a (LTE)
More informationComparison of Numerical Solutions for the Boltzmann Equation and Different Moment Models
Comparison of Numerical Solutions for the Boltzmann Equation and Different Moment Models Julian Koellermeier, Manuel Torrilhon October 12th, 2015 Chinese Academy of Sciences, Beijing Julian Koellermeier,
More informationHypersonic Blunt Body Thermophysics Using a Unified Kinetic/Continuum Solver
41st AIAA Thermophysics Conference 22-25 June 2009, San Antonio, Texas AIAA 2009-3838 Hypersonic Blunt Body Thermophysics Using a Unified Kinetic/Continuum Solver Andrew J. Lofthouse U.S. Air Force Institute
More informationTHE EFFECTS OF LONGITUDINAL RIBS ON ENTROPY GENERATION FOR LAMINAR FORCED CONVECTION IN A MICROCHANNEL
THE EFFECTS OF LONGITUDINAL RIBS ON ENTROPY GENERATION FOR LAMINAR FORCED CONVECTION IN A MICROCHANNEL Nader POURMAHMOUD, Hosseinali SOLTANIPOUR *1,, Iraj MIRZAEE Department of Mechanical Engineering,
More informationSIMULATION OF GAS FLOW OVER MICRO-SCALE AIRFOILS USING A HYBRID CONTINUUM-PARTICLE APPROACH
33rd AIAA Fluid Dynamics Conference and Exhibit 3-6 June 3, Orlando, Florida AIAA 3-44 33 rd AIAA Fluid Dynamics Conference and Exhibit / Orlando, Florida / 3-6 Jun 3 SIMULATION OF GAS FLOW OVER MICRO-SCALE
More informationA Hybrid Continuum / Particle Approach for Micro-Scale Gas Flows
A Hybrid Continuum / Particle Approach for Micro-Scale Gas Flows Quanhua Sun *, Iain D. Boyd * and Graham V. Candler * Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 489 Department
More informationNumerical Simulation of Low Reynolds Number Slip Flow Past a Confined Microsphere
Numerical Simulation of Low Reynolds Number Slip Flow Past a Confined Microsphere Robert W. Barber, and David R. Emerson CLRC Daresbury Laboratory, Daresbury, Warrington, Cheshire, WA4 4AD, UK Abstract.
More informationRevisit to Grad s Closure and Development of Physically Motivated Closure for Phenomenological High-Order Moment Model
Revisit to Grad s Closure and Development of Physically Motivated Closure for Phenomenological High-Order Moment Model R. S. Myong a and S. P. Nagdewe a a Dept. of Mechanical and Aerospace Engineering
More informationProgress Report on Chamber Dynamics and Clearing
Progress Report on Chamber Dynamics and Clearing Farrokh Najmabadi, Rene Raffray, Mark S. Tillack, John Pulsifer, Zoran Dragovlovic (UCSD) Ahmed Hassanein (ANL) Laser-IFE Program Workshop May31-June 1,
More informationCapturing Knudsen Layer Phenomena using a Lattice Boltzmann Model. Abstract
Capturing Knudsen ayer Phenomena using a attice Boltzmann Model Yong-Hao Zhang, Xiao-Jun Gu, Robert W. Barber, and David R. Emerson Centre for Microfluidics and Microsystems Modelling, Computational Science
More informationAll-Particle Multiscale Computation of Hypersonic Rarefied Flow
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition 4-7 January 2010, Orlando, Florida AIAA 2010-822 All-Particle Multiscale Computation of Hypersonic Rarefied
More informationHypersonic Flow over a Wedge with a Particle Flux Method
Hypersonic Flow over a Wedge with a Particle Flux Method M. N. Macrossan, M. V. Metchnik and P. A. Pinto Centre for Hypersonics, School of Engineering, University of Queensland, St Lucia, 47, Australia
More informationLecture1: Characteristics of Hypersonic Atmosphere
Module 1: Hypersonic Atmosphere Lecture1: Characteristics of Hypersonic Atmosphere 1.1 Introduction Hypersonic flight has special traits, some of which are seen in every hypersonic flight. Presence of
More informationPHYSICAL VAPOR DEPOSITION OF THIN FILMS
PHYSICAL VAPOR DEPOSITION OF THIN FILMS JOHN E. MAHAN Colorado State University A Wiley-Interscience Publication JOHN WILEY & SONS, INC. New York Chichester Weinheim Brisbane Singapore Toronto CONTENTS
More informationA Computational Fluid Dynamics Analysis of a High-Pressure Photo-Emission Gas Spectrometer
20th AIAA Computational Fluid Dynamics Conference 27-30 June 2011, Honolulu, Hawaii AIAA 2011-3551 A Computational Fluid Dynamics Analysis of a High-Pressure Photo-Emission Gas Spectrometer Axel Rohde
More informationBasic Concepts and Applications Gas Flows Liquid Flows Particulate Flows Moving Domains and Applications
NSF 2002 Summer School (Urbana-Champaign) Microfluidics George Em Karniadakis Brown University Basic Concepts and Applications Gas Flows Liquid Flows Particulate Flows Moving Domains and Applications Reference:
More informationThermal creep flow by Thomas Hällqvist Veronica Eliasson
Thermal creep flow by Thomas Hällqvist Veronica Eliasson Introduction Thermal creep It is possible to start rarefied gas flows with tangential temperature gradients along the channel walls, where the fluid
More informationRarefied Gas Dynamics
Rarefied Gas Dynamics Rarefied Gas Dynamics Mikhail N. Kogan Computer Center Academy of Sciences of the USSR Moscow Translated from Russian Translation Editor Leon Trilling Department of Aeronautics and
More informationMicro- and nanoscale non-ideal gas Poiseuille flows in a consistent Boltzmann algorithm model
INSTITUTE OFPHYSICS PUBLISHING JOURNAL OFMICROMECHANICS ANDMICROENGINEERING J. Micromech. Microeng. () 7 PII: S9-7()7-9 Micro- and nanoscale non-ideal gas Poiseuille flows in a consistent Boltzmann algorithm
More informationTHEORETICAL AND NUMERICAL STUDIES OF THE AIR DAMPING OF MICRO-RESONATORS IN THE NON-CONTINUUM REGIME. Sarne M. Hutcherson
THEORETICAL AND NUMERICAL STUDIES OF THE AIR DAMPING OF MICRO-RESONATORS IN THE NON-CONTINUUM REGIME A Thesis Presented to The Academic Faculty by Sarne M. Hutcherson In Partial Fulfillment of the Requirements
More informationPROGRESS IN PROBABILISTIC MODELLING OF ATOMIC SPONTANEOUS EMISSION PROCESSES IN DSMC
PROGRESS IN PROBABILISTIC MODELLING OF ATOMIC SPONTANEOUS EMISSION PROCESSES IN DSMC Dejan Petkow (1), Maria Zaretskaya (1), Alexandre Kling (1), Georg Herdrich (2) (1) Advanced Concepts Team (ACT), ESA-ESTEC,
More informationA MICROBEARING GAS FLOW WITH DIFFERENT WALLS TEMPERATURES
Mili}ev, S. S., et al.: A Microbearing Gas Flow with Different Walls Temperatures THERMAL SCIENCE, Year 01, Vol. 16, No. 1, pp. 119-13 119 A MICROBEARING GAS FLOW WITH DIFFERENT WALLS TEMPERATURES by Snežana
More informationProblems of Flows Through Short Channels Studied by Means of the Boltzmann Equation
Problems of Flows Through Short Channels Studied by Means of the Boltzmann Equation Aristov V.V., Frolova A.A. and Zabelok S.A. Dorodnicyn Computing Centre of Russian Academy of Sciences Kolobov V.I. and
More informationNumerical Simulation of Rarefied Gases using Hyperbolic Moment Equations in Partially-Conservative Form
Numerical Simulation of Rarefied Gases using Hyperbolic Moment Equations in Partially-Conservative Form Julian Koellermeier, Manuel Torrilhon May 18th, 2017 FU Berlin J. Koellermeier 1 / 52 Partially-Conservative
More informationOptimizing Nozzle Geometry for Controlling Properties of Molecular Beam with Heavy Organic Molecules
Optimizing Nozzle Geometry for Controlling Properties of Molecular Beam with Heavy Organic Molecules R. V. Maltsev a, A. K. Rebrov a, T. Toccoli b, M. Tonezzer b, N. Coppedè b, and S. Iannotta c. a Institute
More informationEntropy generation and transport
Chapter 7 Entropy generation and transport 7.1 Convective form of the Gibbs equation In this chapter we will address two questions. 1) How is Gibbs equation related to the energy conservation equation?
More informationChemical and Biomolecular Engineering 150A Transport Processes Spring Semester 2017
Chemical and Biomolecular Engineering 150A Transport Processes Spring Semester 2017 Objective: Text: To introduce the basic concepts of fluid mechanics and heat transfer necessary for solution of engineering
More informationTHE CURVATURE EFFECT ON THERMOACOUSTIC WAVES IN A COUETTE RAREFIED GAS FLOW * Peter Gospodinov, Vladimir Roussinov, Dobri Dankov
МАТЕМАТИКА И МАТЕМАТИЧЕСКО ОБРАЗОВАНИЕ, 2015 MATHEMATICS AND EDUCATION IN MATHEMATICS, 2015 Proceedings of the Forty Fourth Spring Conference of the Union of Bulgarian Mathematicians SOK Kamchia, April
More informationMonte Carlo simulations of dense gas flow and heat transfer in micro- and nano-channels
Science in China Ser. E Engineering & Materials Science 2005 Vol.48 No.3 317 325 317 Monte Carlo simulations of dense gas flow and heat transfer in micro- and nano-channels WANG Moran & LI Zhixin Department
More informationFollow this and additional works at:
Washington University in St. Louis Washington University Open Scholarship Mechanical Engineering and Materials Science Independent Study Mechanical Engineering & Materials Science 12-19-2016 The Effects
More informationFluctuating Hydrodynamics and Direct Simulation Monte Carlo
Fluctuating Hydrodynamics and Direct Simulation Monte Carlo Kaushi Balarishnan Lawrence Bereley Lab John B. Bell Lawrence Bereley Lab Alesandar Donev New Yor University Alejandro L. Garcia San Jose State
More informationStati sti cal si mul ati on of reentry capsul e aero dynami cs i n hyp ersoni c near-conti nuum flows
Stati sti cal si mul ati on of reentry capsul e aero dynami cs i n hyp ersoni c near-conti nuum flows Mikhail S. Ivanov Computational Aerodynamics Laboratory, Khristianovich Institute of Theoretical and
More informationSimulation of a typical reentry vehicle TPS local flow features and material response
Simulation of a typical reentry vehicle TPS local flow features and material response E. V. Titov, and D. A. Levin Pennsylvania State University, University Park, PA 1682 Abstract. Statistical BGK/DSMC
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 informationComparison and Analysis of Chemical Models, methodologies and parameters in Hypersonic Rarefied Flows
University of Naples Federico II Ph.D. thesis Comparison and Analysis of Chemical Models, methodologies and parameters in Hypersonic Rarefied Flows by Luigi Morsa Coordinator: Prof. Antonio Moccia Tutor:
More informationParticle Simulation of Nonequilibrium Hypersonic Flows
Particle Simulation of Nonequilibrium Hypersonic Flows Thomas E. Schwartzentruber Assistant Professor Department of Aerospace Engineering and Mechanics (AEM) University of Minnesota [1 /36] Molecular Simulation
More informationParticle-Simulation Methods for Fluid Dynamics
Particle-Simulation Methods for Fluid Dynamics X. Y. Hu and Marco Ellero E-mail: Xiangyu.Hu and Marco.Ellero at mw.tum.de, WS 2012/2013: Lectures for Mechanical Engineering Institute of Aerodynamics Technical
More informationENTROPY. Chapter 7. Mehmet Kanoglu. Thermodynamics: An Engineering Approach, 6 th Edition. Yunus A. Cengel, Michael A. Boles.
Thermodynamics: An Engineering Approach, 6 th Edition Yunus A. Cengel, Michael A. Boles McGraw-Hill, 2008 Chapter 7 ENTROPY Mehmet Kanoglu Copyright The McGraw-Hill Companies, Inc. Permission required
More informationA Hybrid CFD-DSMC Method of Modeling Continuum-Rarefied Flows
42nd AIAA Aerospace Sciences Meeting and Exhibit 5-8 January 24, Reno, Nevada AIAA 24-8 42nd AIAA Aerospace Sciences Meeting and Exhibit Reno, NV January 5 8, 24 A - Method of Modeling Continuum-Rarefied
More information