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October 13, 2016, 06:00
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More stable when using large time step
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New Member
Chunkan Yu
Join Date: Sep 2016
Posts: 7
Rep Power: 9  |
Hello all,
I am facing a "strange" problem. When I use time step dt=5e-6, it runs well. But when I set dt = 1e-6, the solution will be divergent. a little strange due to the CFL-criteria. I leave my geometry here: In x-direction, the length is 2500 mm, and discreted into 100 points with simpleGrading=0.01. In y-direction, the length of one block is 12.7 mm, and discreted into 80 points with simpleGrading=0.1. the length of second block is 1004 mm, and discreted into 200 points with simpleGrading 10. In z-direction only one cell. I am doing the LES simulation with rhoPimpleFoam. tanks a lot for your suggestions and hints |
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