Hybrid Large-Eddy / Reynolds-Averaged Navier-Stokes Simulation of Shock-Separated Flows
Hybrid Large-Eddy / Reynolds-Averaged Navier-Stokes Simulation of Shock-Separated Flows
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DOI：
10.2514/1.3735
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发表时间：
2004-11
影响因子：
1.6
通讯作者：
Chen Fan;X. Xiao;J. Edwards;H. Hassan;R. Baurle
中科院分区：
文献类型：
--
作者：
Chen Fan;X. Xiao;J. Edwards;H. Hassan;R. Baurle
本文对高速激波分离流的大涡/雷诺平均混合模拟（LES/RANS）方法进行了评估。采用一个与距离相关的混合函数，将Menter的k-w剪切应力输运模型中的湍流封闭转换为远离固体表面的k-Δ亚网格封闭。一个修改后的回收/重标度的程序是用来产生随时间变化的波动数据，被送入流入平面的一些计算，其目标是取代传入的边界层与混合LES/RANS边界层，保持几乎相同的水平的波动能量。对斜腔构型马赫数3的流场的模拟突出了网格细化和杂交策略选择的影响，而对20 °压缩角马赫数3的流场的模拟则说明了模型常数的选择和边界层再循环对平均流解的影响。
An assessment of a hybrid large-eddy/Reynolds-averaged simulation (LES/RANS) procedure for high-speed, shock-separated flows is reported. A distance-dependent blending function is used to shift the turbulence closure fromMenter's k-w shear-stress-transport model near solid surfaces to a k-Δ subgrid closure away from solid surfaces and in free-shear regions. A modified recycling/rescaling procedure is used to generate time-dependent fluctuation data that are fed into the inflow plane for some calculations, with the goal being to replace the incoming boundary layer with a hybrid LES/RANS boundary layer that maintains nearly the same levels of fluctuation energy. Simulations of Mach 3 flow over a ramped-cavity configuration highlight the effects of grid refinement and choice of hybridization strategy, while simulations of Mach 3 flow over a 20-deg compression corner illustrate the effects of the choice of model constants and the inclusion of boundary-layer recycling on the mean-flow solutions.