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How to set up Time Step Size correctly ?

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Old   July 8, 2012, 09:52
Default How to set up Time Step Size correctly ?
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Hello everyone, I have been trying to simulate the free-surface flow around a ship in FLUENT, using a VOF(open channel flow)model, hybrid mesh(tetra close to ship, hexa outer domain), SIMPLE and RNG k-e, and yplus mostly in the range of 150-450, the problem is when I set the Time Step Size 0.01(some papers do), the Cd is 0.08, then the Cd changes to 0.04 when I set the Time Step Size to 0.005(some other papers do) . Could u please give me some advices to set the Time Step Size correctly? Thanks~
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Old   July 9, 2012, 04:50
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which solver you are using? pressure or density based? what's the length of your domain, inlet velocity and the size of smallest cell in your mesh? tell me the fallowing parameters then I will guide you how to set the time step correctly.....
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time step size

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