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�������պ����ѧѧ�� 2008, Vol. 34 Issue (7) :755-758    DOI:
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���, ����ƽ*
�������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100191
Hybrid RANS/LES model based on turbulent scale
Li Bin, Wu Songping*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ �Ƚ�BL(Baldwin-Lomax)����ģ�͵��ڲ�ģ����Smagorinsky�Ǹ���ģ��,���ߵ���Ҫ������������߶ȵļ��㷽����ͬ,��RANS(Reynolds Average Numerical Simulation)��������LES(Large Eddy Simulation)����������ʽ��������ͬ��.����������,��չ��RANS/LES���ģ��.��ģ�����������˲��߶��뵽����ľ�����ȴ�����������,�ڽ�����ֱ�����RANS������,��Զ���������,���LES������.Ϊ�˱�֤����ճ��ϵ���������ֽ紦�Ĺ⻬����,���������ճ��ϵ��ͨ����Ϻ�������.��Ϸ��������˶Ա��渽������ֱ��ʵ�Ҫ���ʱ�䲽��������,��˱�LES����ļ���ɱ���.�øû��ģ��ģ������˫����ĸ߳�����������,����������û��ģ�Ϳ���׼ȷ��ģ���ѹ����������.
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Abstract�� The main difference between the inner model of BL(Baldwin-Lomax) turbulent model and the Smagorinsky subgrid model lays in the different methods to calculate the turbulent scale. The governing equations of RANS(Reynolds average numerical simulation) and LES(large eddy simulation) are of same form. A hybrid RANS/LES model is developed here based on above observations. The governing equations of RANS are solved in inner region and the governing equations of LES are solved in outer region. A blending function is used to combine inner and outer turbulent viscous coefficients. The computational cost can be reduced compared with LES model. The hypersonic flow over double ellipsoidal spheres is simulated using the present model. Comparing with the experiment and the data of RANS model, the results show that the approach is validated.
Keywords�� turbulence model   large eddy simulation   compressible flow     
Received 2007-06-05;
About author: �� ��(1978��),��,������������,��ʿ��,baal@mse.buaa.edu.cn.�ֹ������й��տյ����о�Ժ.
���, ����ƽ.���������߶ȵĻ��RANS/LESģ��[J]  �������պ����ѧѧ��, 2008,V34(7): 755-758
Li Bin, Wu Songping .Hybrid RANS/LES model based on turbulent scale[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(7): 755-758
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I7/755
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