Simultaneous simulation of transition and massive separation by RANS-LES-Tr model
Simultaneous simulation of transition and massive separation by RANS-LES-Tr model
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DOI：
10.1016/j.ast.2020.106026
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发表时间：
2020-10
影响因子：
5.6
通讯作者：
Guangxing Wang;Zhixiang Xiao;Lianzhong Chen
中科院分区：
文献类型：
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作者：
Guangxing Wang;Zhixiang Xiao;Lianzhong Chen
为了模拟迎风面转捩和背风面大尺度分离等复杂流动，在k-ω-γ三方程转捩模型（RANS-LES-Tr）的基础上，建立了雷诺平均NS-LES混合模型。然后，应用该方法对低速圆柱绕流、低速长椭球绕流、高超声速猎户座飞船绕流3种情况进行了数值模拟，其中低速圆柱绕流仅采用第一过渡模态;低速长椭球绕流采用第一过渡模态和横流模态;高超声速飞船绕流采用第一、第二过渡模态和横流模态。与基于全湍流模型的RANS-LES相比，RANS-LES-Tr与迎风面的表面摩擦力和热通量等现有测量结果有更好的一致性。
To predict complex flow, including transition on the windward side and massive separation on the leeward side, a Reynolds averaged Navier Stokes-Large Eddy Simulation (RANS-LES) hybrid model based on the three-equationk-ω-γtransition model (RANS-LES-Tr) was developed. Then, it was applied to simulate the following three cases, such as the low-speed flow past a cylinder only with the first transition mode, the low-speed prolate spheroid flow at a high angle of attack (AoA) with both the first and crossflow modes; and hypersonic flow past the “Orion” capsule with the first, second and crossflow modes. RANS-LES-Tr shows much better agreements with available measurements, such as skin friction and heat flux on the windward side, than RANS-LES based on the full turbulence model.