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�������պ����ѧѧ�� 2008, Vol. 34 Issue (01) :5-8    DOI:
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1. �������պ����ѧ ��Դ�붯������ѧԺ, ���� 100083;
2. �������պ����ѧ ���Ҽ���������ѧʵ����,���� 100083
Wall model in LES based on coherent structures
Zhang Nan1, Liu Kai1, Lu Lipeng1, Yuan Xiangjiang2*
1. School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. National CFD Lab, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The evolvement of a group of coherent structures in a turbulent boundary layer was studied previously. An initial structure was formed by the resonant triad waves which developed periodically in the streamwise direction. The characteristics and evolvement processes of the coherent structures were obtained by direct numerical simulation. Based on the coherent structures, a new type of wall model for large-eddy simulation (LES) was established. The height at which to supply the wall model was determined. And different choices of boundary conditions were tested. The results of a channel flow LES indicate that: the wall model decreases grid number adjacent to the wall region; the wall model provides the core flow LES sufficient near-wall region information so that the simulation can gain exact results compared with that without wall models.
Keywords�� turbulence   computer simulation   wall model   large-eddy simulation   coherent structure     
Received 2007-01-15;
Fund:

������Ȼ��ѧ����������Ŀ (50476004)

About author: �� �(1981��),��,�ӱ��ػʵ���,��ʿ��,ZhangNan@sjp.buaa.edu.cn.
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���,����,½����,Ԭ�潭.������ɽṹ�Ĵ���ģ�����ģ��[J]  �������պ����ѧѧ��, 2008,V34(01): 5-8
Zhang Nan, Liu Kai, Lu Lipeng, Yuan Xiangjiang.Wall model in LES based on coherent structures[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(01): 5-8
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