基于当地流动结构的RANS/LES混合模型

doi:10.7527/S1000-6893.2013.0522

Abstract

Abstract:

In order to overcome the inherent deficiency of the traditional Reynolds Averaged Navier-Stokes/large eddy simulation (RANS/LES) hybrid model, i.e., 'the bridging problem of RANS and LES', a discriminating function extracted from Vreman's subgrid-scale (SGS) model, which is used to describe flow regimes, is employed to formulate a new RANS/LES hybrid model. The model coefficients are calibrated by incompressible turbulent channel flows. The test cases include incompressible turbulent channel flows, stable-state supersonic boundary layers over a flat plate, flow past NACA4412 airfoil and flow past a circular cylinder at subcritical Reynolds numbers. This new model is not only able to solve the modeled-stress-depletion problem, but also greatly raises the accuracy when compared with the traditional RANS/LES hybrid approach, such as detached eddy simulation (DES) in predicting large-scale unsteadiness. Furthermore, the model can also solve the log-layer mismatch (LLM) problem when RANS/LES hybrid is employed as wall modeled LES, thus extending the ability of Vreman's LES model in dealing with coarse meshes. The accuracy is greatly improved.

Key words: turbulence model, hybrid RANS/LES, large-scale separation, large eddy simulation, detached eddy simulation

CLC Number:

V211.3

XU Jinglei, GAO Ge, YANG Yan. A RANS/LES Hybrid Model Based on Local Flow Structure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(11): 2992-2999.

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A RANS/LES Hybrid Model Based on Local Flow Structure

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