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October 28, 2009, 08:52 |
Choosing the right timestep
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#1 |
Member
Dennis Rown
Join Date: Oct 2009
Posts: 51
Rep Power: 17 |
Hello!
I simulate with sonicFoam a tube with different pressures in it and have problems with the timestep. Sometimes with a chosen timestep, simulation lasts about 1 hour before it fails (and the Courand number is over 1). Is there a way to determine, how large the Courand number will get or is there even a possibility to set the maximum Courand number, so that the timestep will vary? |
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October 28, 2009, 12:21 |
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#2 |
Senior Member
Anton Kidess
Join Date: May 2009
Location: Germany
Posts: 1,377
Rep Power: 30 |
Yes, there is a possibility to specify a maximum Courant number. See how it's implemented in the interFoam solver (http://www.opencfd.co.uk/openfoam/doc/damBreak.html), or also threads in the forum (e.g. http://www.cfd-online.com/Forums/ope...co-number.html).
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October 29, 2009, 03:58 |
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#3 |
Member
Dennis Rown
Join Date: Oct 2009
Posts: 51
Rep Power: 17 |
Thanks a lot! Like in the post of your link, I also has to add some #include statements into the solver I used (sonicFoam). Now it works great!
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