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Old   November 6, 2012, 07:02
Default CFD basics
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Can someone please help me explaining: Why grids with high number of cells (3 millions) require very small timestep size? and How could I determine that how many number of iteration per time step is required for solution to converge?
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Old   November 6, 2012, 09:58
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Assuming you are talking about an explicit time marching method, it is because of the CFL condition:
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