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speeding up vortex shedding

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Old   March 13, 2007, 16:33
Default speeding up vortex shedding
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Harish
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I read in few papers that introducing some kind of initial disturbance can speed up the vortex shedding for flow past a cylinder in an unsteady flow.I need some ideas on what kind of initial disturbance should i use.Something like an initial vortex or pressure pulse.?

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Old   March 14, 2007, 10:22
Default Re: speeding up vortex shedding
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Mani
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Nothing too complicated. Simply destroy the symmetry of the steady solution to get shedding started. For, example, choose a converged but asymmetric steady solution, say with a 10 degree angle of attack, as your initial condition for the unsteady computation.
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Old   March 15, 2007, 04:24
Default Re: speeding up vortex shedding
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Ramp
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Rotate cylinder (first in clockwise direction for some iteration and then in the anticlockwise for some more itereations).. then keep the cylinder stationay and continue the simulations...

Braza etal, JFM.. have give a detailed study on cylinder vortex...
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