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Time Step Size

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Old   August 12, 2007, 22:56
Default Time Step Size
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I am running a flow past cylinder at Re=10000. I'd like to know how can I determine the eppropriate time step size to get the right drag, lift and vortex shedding. I notice when I cahnge my time step size from 1e-5 to 1e-4 my drag coefficient will change.

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Old   August 13, 2007, 05:59
Default Re: Time Step Size
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0.01 * Shedding period calculated from the Strouhal number is a good initial guess.
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