一种改进的类DES湍流模拟方法

汪洪波; 孙明波; 吴海燕; 王振国

一种改进的类DES湍流模拟方法

国防科学技术大学航天与材料工程学院,长沙 410073

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出版历程
- 收稿日期: 2010-11-02
- 修回日期: 2011-02-21
- 刊出日期: 2011-10-28

Improved DES-like method for simulation of turbulent flows

College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 构造了一种基于一方程S-A(Spalart-Allmaras)模型和一方程Yoshizawa亚格子模型的混合RANS/LES(Reynolds-averaged Navier-Stokes/large eddy simulation)湍流模拟方法.在涡黏假设的基础上,将Yoshizawa亚格子湍动能方程转化为等效的亚格子湍流涡黏性输运方程,并采用混合函数将其与S-A模型方程进行混合,从而改进了DES(detached eddy simulation)模型的亚格子行为,同时克服了其依靠网格控制模型转换的缺点.模拟了超声速的带斜坡凹腔流动,并与相同网格下的LES及DES结果进行了比较,结果表明该混合RANS/LES方法在远离壁面的自由剪切流区域与LES行为一致,而在附着边界层区域表现优于LES和DES方法.
- 混合RANS/LES(Reynolds-averaged Navier-Stokes/large eddy simulation) /
- 混合函数 /
- 凹腔 /
- 超声速 /
- 亚格子模型
Abstract: A hybrid RANS/LES (Reynolds-averaged Navier-Stokes/large eddy simulation) approach based on one-equation S-A(Spalart-Allmaras) RANS model and one-equation Yoshizawa SGS(sub-grid scale) model was developed.The turbulent kinetic energy transport equation of the SGS model was transformed to an equivalent eddy viscosity transport equation,and then blended with the S-A model equation to generate a hybrid eddy viscosity transport equation,wherein both the SGS behavior and the grid-depending RANS-LES transition of DES were improved.The hybrid RANS/LES approach was then applied to simulate a supersonic,ramped cavity flow,where LES and DES were also implemented on the same mesh for comparison.It shows that the hybrid RANS/LES acts like LES in the free shear flow far away from the wall and outperforms LES and DES in the attached boundary layer.
- hybrid RANS/LES(Reynolds-averaged Navier-Stokes/large eddy simulation) /
- blending function /
- cavity /
- supersonic /
- sub-grid scale model

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参考文献(14)

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