A New Version of Dynamic RANS/LES Hybrid Method

Rui Zhao; Chao Wang; Hai Bo Li; Yue Jun Li

doi:10.13675/j.cnki.tjjs.2017.09.005

A New Version of Dynamic RANS/LES Hybrid Method

Rui Zhao, Chao Wang, Hai Bo Li, Yue Jun Li

School of Aerospace Engineering

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

1 Citation (Scopus)

Abstract

A new version of RANS/LES hybrid method with the entropy function f_s as the blending function is proposed to avoid the dependence on the grid. Three test cases including supersonic turbulent boundary-layer flow, supersonic cavity-ramp flow and supersonic base flow are chosen to evaluate its performance. The results of the original detached-eddy simulation (DES97) are also included for comparison. It shows that turbulent boundary-layer region is reliably denoted by f_s for both attached and separated flows. Compared by the results of DES97, the modeled stress depletion (MSD) phenomenon induced by refined grid is largely suppressed without loss of LES content after massive separation. Moreover, f_s is deduced from the point of energy dissipation, independent of any particular turbulent quantities. That is, this entropy function could be utilized by other RANS/LES strategies.

Original language	English
Pages (from-to)	1950-1955
Number of pages	6
Journal	Tuijin Jishu/Journal of Propulsion Technology
Volume	38
Issue number	9
DOIs	https://doi.org/10.13675/j.cnki.tjjs.2017.09.005
Publication status	Published - 1 Sept 2017

Keywords

Computational fluid dynamics
Detached-eddy simulation
Entropy
Hybrid method

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title = "A New Version of Dynamic RANS/LES Hybrid Method",

abstract = "A new version of RANS/LES hybrid method with the entropy function fs as the blending function is proposed to avoid the dependence on the grid. Three test cases including supersonic turbulent boundary-layer flow, supersonic cavity-ramp flow and supersonic base flow are chosen to evaluate its performance. The results of the original detached-eddy simulation (DES97) are also included for comparison. It shows that turbulent boundary-layer region is reliably denoted by fs for both attached and separated flows. Compared by the results of DES97, the modeled stress depletion (MSD) phenomenon induced by refined grid is largely suppressed without loss of LES content after massive separation. Moreover, fs is deduced from the point of energy dissipation, independent of any particular turbulent quantities. That is, this entropy function could be utilized by other RANS/LES strategies.",

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AB - A new version of RANS/LES hybrid method with the entropy function fs as the blending function is proposed to avoid the dependence on the grid. Three test cases including supersonic turbulent boundary-layer flow, supersonic cavity-ramp flow and supersonic base flow are chosen to evaluate its performance. The results of the original detached-eddy simulation (DES97) are also included for comparison. It shows that turbulent boundary-layer region is reliably denoted by fs for both attached and separated flows. Compared by the results of DES97, the modeled stress depletion (MSD) phenomenon induced by refined grid is largely suppressed without loss of LES content after massive separation. Moreover, fs is deduced from the point of energy dissipation, independent of any particular turbulent quantities. That is, this entropy function could be utilized by other RANS/LES strategies.

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A New Version of Dynamic RANS/LES Hybrid Method

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