Simulation of Wing-Body Junction Flows with Hybrid RANS/LES Methods
Simulation of Wing-Body Junction Flows with Hybrid RANS/LES Methods
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DOI：
10.1615/ichmt.2006.turbulheatmasstransf.830
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
S. Fu;Zhixiang Xiao;Haixin Chen;Yufei Zhang;Jingbo Huang
中科院分区：
文献类型：
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作者：
S. Fu;Zhixiang Xiao;Haixin Chen;Yufei Zhang;Jingbo Huang
摘要本文采用雷诺平均纳维-斯多克斯（RANS）和大涡模拟（LES）混合方法，研究了零迎角下的Rood和12.5°迎角下的NASA TN D-712两种翼身结合部的流动。一种是分离涡模拟（DES），另一种是延迟涡模拟（delay -DES），它们都是基于弱非线性两方程k -ω模型。虽然RANS方法可以较为准确地预测平均流动行为，但与现有的实验数据相比，其对湍流动能和剪应力的预测效果并不理想。DES通过在湍流动能方程的耗散项中引入长度尺度，导致了流动分离、涡旋或涡旋破裂的过早发生。DDES的延迟效应对流动结构和湍流特性有很大的改善，与实测结果吻合较好。
Abstract In this paper, flows past two wing-body junctions, the Rood at zero angle of attack and NASA TN D-712 at 12.5° angle of attack, are investigated with two Reynolds-Averaged Navier-Stokes (RANS) and large eddy simulation (LES) hybrid methods. One is detached eddy simulation (DES) and the other is delayed-DES, both are based on a weakly nonlinear two-equation k–ω model. While the RANS method can predict the mean flow behaviours reasonably accurately, its performance for the turbulent kinetic energy and shear stress, as compared with available experimental data, is not satisfactory. DES, through introducing a length scale in the dissipation terms of the turbulent kinetic energy equation, delivers flow separation, a vortex or the onset of vortex breakdown too early. DDES, with its delayed effect, shows a great improvement in flow structures and turbulence characteristics, and agrees well with measurements.