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[snappyHexMesh] mesh related problem with high courant-number at edge |
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#1 |
Member
Mona
Join Date: Mar 2016
Location: Berlin
Posts: 49
Rep Power: 10 ![]() |
Hi everyone,
I am trying to simulate a pitching floater in a numerical wave tank in 3D. I am using ihDyMFoam and a dynamic Mesh. One edge of the floater is curved. SnappyHexMesh is creating quite skew faces here, which I am not able to remove. If I lower the values for maximum skewness in the meshQualityControls I get cells that stick out and can't be snapped in again with snapEdge. Making the refinement on the surface coarser or finer also doesn't change the situation. The problem that I am facing now are quite big courant-numbers only in these cells (See attached picture) . And this happens already after 0.2 seconds, so long before the wave is supposed to hit the floater. Right now I am using a timestep of 0.001 s and I don't really want to lower it just because of these few cells. Does anyone have an idea how to deal with this problem? Thanks for you help! Cheers, Mona |
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#2 |
Member
Mona
Join Date: Mar 2016
Location: Berlin
Posts: 49
Rep Power: 10 ![]() |
Update: After 0.47 seconds the courant-number explodes and the simulation crashes. I think its because of this one cell on the corner that you can see in the 2nd picture at time 0.45.
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#3 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 ![]() |
Did you find any solution ?
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#4 |
Member
Mona
Join Date: Mar 2016
Location: Berlin
Posts: 49
Rep Power: 10 ![]() |
Kind of... I am simulating in quasi 2D instead now. So I am just using a thin slice of the body. It was much easier to achieve good mesh quality in that way, and its faster
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Tags |
courant number, ihdyfoam, snappyhexmesh |
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