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Large Eddy Simulation of Complex Turbulent Flows

Berglund, Magnus LU (2006)
Abstract
This thesis concerns the Large Eddy Simulation methodology and its application to predict complex turbulent flows at high Reynolds numbers, and at times also with high Mach numbers. The meaning of the word ?complex? refers both to the presence of complex flow phenomena and the, often, complex geometry of man-made devices restricting the flow. A fairly thorough evaluation study of the numerical methods and the LES framework have been performed in order to assess numerical properties, such as handling of small scales. This is done by numerically solving a number of time-dependent problems in one, two, and three dimensions with and without the use of flux limiters. For evaluation of the methodology when applied to complex turbulent flows,... (More)
This thesis concerns the Large Eddy Simulation methodology and its application to predict complex turbulent flows at high Reynolds numbers, and at times also with high Mach numbers. The meaning of the word ?complex? refers both to the presence of complex flow phenomena and the, often, complex geometry of man-made devices restricting the flow. A fairly thorough evaluation study of the numerical methods and the LES framework have been performed in order to assess numerical properties, such as handling of small scales. This is done by numerically solving a number of time-dependent problems in one, two, and three dimensions with and without the use of flux limiters. For evaluation of the methodology when applied to complex turbulent flows, four different flow problems have been considered:



? Incompressible flow around a prolate spheroid at an angle of attack.



? Development and qualitative evaluation of a model for reacting gas-solid flow inside and around a statically fired solid propellant rocket.



? Inflow turbulence effects in compressible injection-driven flow in a nozzleless rocket motor.



? Compressible non-reacting flow, although including air-fuel mixing, in a scramjet engine model.



The aim is to clarify issues pertaining to:



? Understanding of subgrid scales and their modeling.



? Understand and determine limitations of LES for different Mach numbers or other parameters.



? The interaction between numerical effects and subgrid scale modeling.



? Analysis of instability problems in solid propellant rocket motors. Progress has been made in all these issues. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Prof. Sagaut, Pierre, Université Pierre & Marie Curie, Paris, France
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Gases, fluid dynamics, plasmas, Computational Fluid Dynamics (CFD), Large Eddy Simulation, Complex Turbulent Flows, plasma, Gaser, fluiddynamik
pages
282 pages
publisher
Division of Fluid Mechanics, Department of Energy Sciences, Lund Institute of Technology, Lund University
defense location
M-building, room M:E, Ole Römers väg 1, Lund
defense date
2006-06-12 13:15
ISBN
91-628-6879-9
language
English
LU publication?
yes
id
68429c58-e87f-4925-b36b-6c110c40824f (old id 546967)
date added to LUP
2007-09-06 12:37:41
date last changed
2016-09-19 08:45:12
@phdthesis{68429c58-e87f-4925-b36b-6c110c40824f,
  abstract     = {This thesis concerns the Large Eddy Simulation methodology and its application to predict complex turbulent flows at high Reynolds numbers, and at times also with high Mach numbers. The meaning of the word ?complex? refers both to the presence of complex flow phenomena and the, often, complex geometry of man-made devices restricting the flow. A fairly thorough evaluation study of the numerical methods and the LES framework have been performed in order to assess numerical properties, such as handling of small scales. This is done by numerically solving a number of time-dependent problems in one, two, and three dimensions with and without the use of flux limiters. For evaluation of the methodology when applied to complex turbulent flows, four different flow problems have been considered:<br/><br>
<br/><br>
? Incompressible flow around a prolate spheroid at an angle of attack.<br/><br>
<br/><br>
? Development and qualitative evaluation of a model for reacting gas-solid flow inside and around a statically fired solid propellant rocket.<br/><br>
<br/><br>
? Inflow turbulence effects in compressible injection-driven flow in a nozzleless rocket motor.<br/><br>
<br/><br>
? Compressible non-reacting flow, although including air-fuel mixing, in a scramjet engine model.<br/><br>
<br/><br>
The aim is to clarify issues pertaining to:<br/><br>
<br/><br>
? Understanding of subgrid scales and their modeling.<br/><br>
<br/><br>
? Understand and determine limitations of LES for different Mach numbers or other parameters.<br/><br>
<br/><br>
? The interaction between numerical effects and subgrid scale modeling.<br/><br>
<br/><br>
? Analysis of instability problems in solid propellant rocket motors. Progress has been made in all these issues.},
  author       = {Berglund, Magnus},
  isbn         = {91-628-6879-9},
  keyword      = {Gases,fluid dynamics,plasmas,Computational Fluid Dynamics (CFD),Large Eddy Simulation,Complex Turbulent Flows,plasma,Gaser,fluiddynamik},
  language     = {eng},
  pages        = {282},
  publisher    = {Division of Fluid Mechanics, Department of Energy Sciences, Lund Institute of Technology, Lund University},
  school       = {Lund University},
  title        = {Large Eddy Simulation of Complex Turbulent Flows},
  year         = {2006},
}