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�������պ����ѧѧ�� 2011, Vol. 37 Issue (6) :701-704    DOI:
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��̨��������Hybrid RANS/LESģ��
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�������պ����ѧ ��Դ�붯������ѧԺ, ���� 100191
Hybrid RANS-LES method applied to backward facing step flow
Wu Jingfeng, Ning Fangfei*
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ ������ŵƽ����Navier-Stokes�ʹ���ģ���ϵķ����Ժ�̨��������������ֵģ��,����ʵ���������˶Ա�;�����߶Ȳ���IDDES(Improved Delayed Detached Eddy Simulation)ģʽ:������������������ʱ,��Ϸ���ת��ΪWMLES(Wall Modeling in LES)ģ��,���˽�������Ĵ󲿷�������ֱ�����;����������������ʱ,ת��ΪDDES(Delayed Detached Eddy Simulation)ģʽ,�������ô�RANSģ��,���������������������ģ�ⷽ��ģ��;����ͨ������ɢ����ӭ���͵ͺ�ɢͨ�����Ѹ�ʽ���������Ľ�ƫб�ԳƸ�ʽ��ϵ�ģʽ;����ģ�Ͳ���Spalart-Allmaras(S-A)ģ��;�Ǹ��ӳ��ȳ߶�ȡ��������ֲ��͵�����ľ���.
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Abstract�� Turbulent flow over a backward facing step was simulated using a hybrid Reynolds averaged navier stokes (RANS)-large eddy simulation(LES) approach, and the results were compared with experimental data. The hybrid system combines delayed detached-eddy simulation (DDES) with an improved RANS-LES hybrid model aimed at wall modeling in LES (WMLES). It ensures a different response depending on whether the simulation has inflow turbulent content. In the case of with inflow turbulent content, the WMLES branch of the system is active: most of the turbulent is resolved expect the flow near the wall. In the other case, the DDES branch of the system is active,i.e., it gives a pure RANS solution for attached flows and a DES-like solution for massively separated flows. In the system, a scheme which combines the upwind low-diffusion flux-splitting scheme and fourth-order skew-symmetric scheme was used as the convective flux scheme. The spalart-allmaras(S-A)model was applied as a subgrid scale(SGS)model. The definition of the subgrid length-scale was new which depends not only on the grid spacing, but also on the wall distance.
Keywords�� backward facing step flow   detached eddy simulation   convection scheme     
Received 2010-12-10;
Fund:

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About author: �⾧��(1983-),��,����ӥ̶��,��ʿ��,buaawjf@sohu.com.
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�⾧��, ������.��̨��������Hybrid RANS/LESģ��[J]  �������պ����ѧѧ��, 2011,V37(6): 701-704
Wu Jingfeng, Ning Fangfei.Hybrid RANS-LES method applied to backward facing step flow[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(6): 701-704
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