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December 25, 2017, 07:45
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min time step in transient CFD
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#1 |
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Senior Member
A. Min
Join Date: Mar 2015
Posts: 305
Rep Power: 12  |
Hi all
The maximum of time step is calculated by Courant Number. Is there any limitation for min time step in transient CFD simulations? I have a transient problem that it will be solved for Cr=0.8 . Now I want to investigate the independence of my problem from time step. so I increased my Cr from 0.8 to 0.3. Every thing is good and exact until 50% of the total time. after that suddenly residuals become in order of 10^20 and time step in order of 10^-10 !!! pressure and velocity become unbounded and the problem become diverged! Thanks |
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| Tags |
| time step size, transient |
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