Abstract
The vortex structure within a separated flow region changes when the fluctuation is introduced in a mean flow. This change was investigated by numerical simulation. The artificial periodic velocity fluctuation was introduced into a mean flow upstream of the separation region. This periodic fluctuation flaps the shear layer of the separation region to make vortices be shed with the frequency of fluctuation. For making the separation region narrow, it is most effective that the introduced frequency is about harmonic of the frequency of the vortex shedding from separation region without fluctuation. So in this frequency range, vortices of the characteristic scale are shed periodically, so that this characteristic vortex scale will be significant.
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