Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow
This paper is devoted to the second-order closure for compressible turbulent flows with special attention paid to modeling the pressure-strain correlation appearing in the Reynolds stress equation. This term appears as the main one responsible for the changes of the turbulence structures that arise...
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Isfahan University of Technology
2016-01-01
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doaj-d8f56dd2c02b48dc9f99d0ac5371d25e2020-11-25T00:22:24ZengIsfahan University of Technology Journal of Applied Fluid Mechanics1735-35722016-01-019626852693.Evaluation Study of Pressure-Strain Correlation Models in Compressible FlowAicha Hanafi0H. Khlifi1Faculty of science, Tunisia-This paper is devoted to the second-order closure for compressible turbulent flows with special attention paid to modeling the pressure-strain correlation appearing in the Reynolds stress equation. This term appears as the main one responsible for the changes of the turbulence structures that arise from structural compressibility effects. The structure of the gradient Mach number is similar to that of turbulence, therefore this parameter may be appropriate to study the changes in turbulence structures that arise from structural compressibility effects. Thus, the incompressible model (LRR) of the pressure-strain correlation and its corrected form by using the turbulent Mach number, fail to correctly evaluate the compressibility effects at high shear flow. An extension of the widely used incompressible model (LRR) on compressible homogeneous shear flow is the major aim of the present work. From this extension the standard coefficients Ci became a function of the compressibility parameters (the turbulent Mach number and the gradient Mach number). Application of the model on compressible homogeneous shear flow by considering various initial conditions shows reasonable agreement with the DNS results of Sarkar. The ability of the models to predict the equilibrium states for the flow in cases A1 and A4 from DNS results of Sarkar is examined, the results appear to be very encouraging. Thus, both parameters Mt and Mg should be used to model significant structural compressibility effects at high-speed shear flow.http://jafmonline.net/JournalArchive/download?file_ID=41371&issue_ID=237Compressible; Turbulence; Pressure-strain; Model of turbulence; Shear flow. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Aicha Hanafi H. Khlifi |
spellingShingle |
Aicha Hanafi H. Khlifi Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow Journal of Applied Fluid Mechanics Compressible; Turbulence; Pressure-strain; Model of turbulence; Shear flow. |
author_facet |
Aicha Hanafi H. Khlifi |
author_sort |
Aicha Hanafi |
title |
Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow |
title_short |
Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow |
title_full |
Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow |
title_fullStr |
Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow |
title_full_unstemmed |
Evaluation Study of Pressure-Strain Correlation Models in Compressible Flow |
title_sort |
evaluation study of pressure-strain correlation models in compressible flow |
publisher |
Isfahan University of Technology |
series |
Journal of Applied Fluid Mechanics |
issn |
1735-3572 |
publishDate |
2016-01-01 |
description |
This paper is devoted to the second-order closure for compressible turbulent flows with special attention paid to modeling the pressure-strain correlation appearing in the Reynolds stress equation. This term appears as the main one responsible for the changes of the turbulence structures that arise from structural compressibility effects. The structure of the gradient Mach number is similar to that of turbulence, therefore this parameter may be appropriate to study the changes in turbulence structures that arise from structural compressibility effects. Thus, the incompressible model (LRR) of the pressure-strain correlation and its corrected form by using the turbulent Mach number, fail to correctly evaluate the compressibility effects at high shear flow. An extension of the widely used incompressible model (LRR) on compressible homogeneous shear flow is the major aim of the present work. From this extension the standard coefficients Ci became a function of the compressibility parameters (the turbulent Mach number and the gradient Mach number). Application of the model on compressible homogeneous shear flow by considering various initial conditions shows reasonable agreement with the DNS results of Sarkar. The ability of the models to predict the equilibrium states for the flow in cases A1 and A4 from DNS results of Sarkar is examined, the results appear to be very encouraging. Thus, both parameters Mt and Mg should be used to model significant structural compressibility effects at high-speed shear flow. |
topic |
Compressible; Turbulence; Pressure-strain; Model of turbulence; Shear flow. |
url |
http://jafmonline.net/JournalArchive/download?file_ID=41371&issue_ID=237 |
work_keys_str_mv |
AT aichahanafi evaluationstudyofpressurestraincorrelationmodelsincompressibleflow AT hkhlifi evaluationstudyofpressurestraincorrelationmodelsincompressibleflow |
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1725359953083891712 |