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November 6, 2012, 06:02
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CFD basics
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Member
Prateek
Join Date: Mar 2012
Location: Bangalore
Posts: 32
Rep Power: 14  |
Hi,
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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November 6, 2012, 08:58
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#2 |
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Senior Member
Chris DeGroot
Join Date: Nov 2011
Location: Canada
Posts: 414
Rep Power: 17 |
Assuming you are talking about an explicit time marching method, it is because of the CFL condition: http://en.wikipedia.org/wiki/Courant...Lewy_condition.
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