Abstract
Surface shear stress is generated by flows near a solid object. For several decades, whether surface shear stress fluctuation is a sound source or not has been discussed. On the one hand, Howe insisted that surface shear stress fluctuation is not a sound source. But on the other hand, Shariff and Wang claimed that shear stress fluctuation is a sound source by numerical simulation. In this paper, surface shear stress fluctuation is studied on the condition that shear stress fluctuation is a sound source. We computed the time evolution of surface shear-stress caused by vortex pair colliding with a non-slip wall. It is revealed that surface shear-stress fluctuation is influenced by secondary vortex on the wall very much. An absolute value of surface shear-stress is increased when a vortex pair approaches the wall because of an increase of an absolute value of vorticity of secondary vortex. After, an absolute value of surface shear-stress is decreased and the position of maximum value of an absolute value of surface shear stress is changed because the vortex pair is separated with secondary vortex. This surface shear-stress fluctuation mechanism might be a one of the sound source.
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