Entropy and its application in turbulence modeling

Rui Zhao; Jili Rong; Xinliang Li

doi:10.1007/s11434-014-0569-y

Entropy and its application in turbulence modeling

Rui Zhao^*, Jili Rong, Xinliang Li

^*Corresponding author for this work

School of Aerospace Engineering

CAS - Institute of Mechanics

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The entropy concept was introduced into the turbulence modeling strategy in the present work. First, the turbulent boundary-layer was described from the point of energy dissipation. Based on the theoretical analysis and direct numerical simulations, the relationship between the entropy increment and viscosity dissipation was systematically investigated. Then, an entropy function f_s was proposed to distinguish the turbulent boundary-layer from the external flow. This function is universal, independent of the inflow conditions or any specific turbulence model. With this function, a new version of delayed-detached-eddy simulation method SDES was constructed and verified with the supersonic boundary-layer flow and the cavity-ramped flow. Initial results showed that this method could successfully avoid the modeled stress depletion problem inherited from the original DES method.

Original language	English
Pages (from-to)	4137-4141
Number of pages	5
Journal	Chinese Science Bulletin
Volume	59
Issue number	31
DOIs	https://doi.org/10.1007/s11434-014-0569-y
Publication status	Published - 1 Aug 2014

Keywords

Entropy
RANS/LES hybrid method
Turbulence boundary-layer
Turbulence modeling

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10.1007/s11434-014-0569-y

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abstract = "The entropy concept was introduced into the turbulence modeling strategy in the present work. First, the turbulent boundary-layer was described from the point of energy dissipation. Based on the theoretical analysis and direct numerical simulations, the relationship between the entropy increment and viscosity dissipation was systematically investigated. Then, an entropy function fs was proposed to distinguish the turbulent boundary-layer from the external flow. This function is universal, independent of the inflow conditions or any specific turbulence model. With this function, a new version of delayed-detached-eddy simulation method SDES was constructed and verified with the supersonic boundary-layer flow and the cavity-ramped flow. Initial results showed that this method could successfully avoid the modeled stress depletion problem inherited from the original DES method.",

keywords = "Entropy, RANS/LES hybrid method, Turbulence boundary-layer, Turbulence modeling",

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T1 - Entropy and its application in turbulence modeling

AU - Zhao, Rui

AU - Rong, Jili

AU - Li, Xinliang

PY - 2014/8/1

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N2 - The entropy concept was introduced into the turbulence modeling strategy in the present work. First, the turbulent boundary-layer was described from the point of energy dissipation. Based on the theoretical analysis and direct numerical simulations, the relationship between the entropy increment and viscosity dissipation was systematically investigated. Then, an entropy function fs was proposed to distinguish the turbulent boundary-layer from the external flow. This function is universal, independent of the inflow conditions or any specific turbulence model. With this function, a new version of delayed-detached-eddy simulation method SDES was constructed and verified with the supersonic boundary-layer flow and the cavity-ramped flow. Initial results showed that this method could successfully avoid the modeled stress depletion problem inherited from the original DES method.

AB - The entropy concept was introduced into the turbulence modeling strategy in the present work. First, the turbulent boundary-layer was described from the point of energy dissipation. Based on the theoretical analysis and direct numerical simulations, the relationship between the entropy increment and viscosity dissipation was systematically investigated. Then, an entropy function fs was proposed to distinguish the turbulent boundary-layer from the external flow. This function is universal, independent of the inflow conditions or any specific turbulence model. With this function, a new version of delayed-detached-eddy simulation method SDES was constructed and verified with the supersonic boundary-layer flow and the cavity-ramped flow. Initial results showed that this method could successfully avoid the modeled stress depletion problem inherited from the original DES method.

KW - Entropy

KW - RANS/LES hybrid method

KW - Turbulence boundary-layer

KW - Turbulence modeling

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SP - 4137

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JO - Chinese Science Bulletin

JF - Chinese Science Bulletin

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Entropy and its application in turbulence modeling

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Keywords

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