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create short pulse to cause instabilities

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Old   January 27, 2009, 06:47
Default create short pulse to cause instabilities
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I am trying to model vortex shedding of a 2D cylinder at re 1000. my understanding is that after a while, errors will cause instailities which will intialise the vortex shedding. I have had my model running all night at timestep of 0.05 with 40 iterations per step, and it seems to still be pretty stable. Is there a way to create a pulse to initiate vortex shedding? Many thanks
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