Article ID Journal Published Year Pages File Type
1548993 Progress in Natural Science: Materials International 2008 6 Pages PDF
Abstract

Large eddies induced by local impulse at the wall with pressure gradients in the boundary layer was studied by direct numerical simulations. The results show that the amplitude evolution, the high and low speed stripes, the formation of streamwise vortices, the ejection and sweeping, inflexions and distortion at the mean velocity profiles, as well as other characteristics, are consistent with the experimental and other numerical results. It is also found that large eddies are easy to be excited with adverse pressure gradient in the boundary layer, and the growth of amplitudes, formation of streamwise vortices and the influencing area etc., are much larger than those with favorable pressure gradient in the boundary layer. In contrast, large eddies are hardly to be induced through local impulse disturbance at the wall with favorable pressure gradients in the boundary layer.

Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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