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March 3, 2011, 04:40 |
a mesh motion question
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#1 |
New Member
John
Join Date: Mar 2011
Posts: 7
Rep Power: 15 |
Dear all,
I am working on a fsi case. The fluid model can work well before mesh motion is turned on. But if I used mesh motion, even without fsi, it got overflow quickly. Even if I use the result of static mesh case as the initial condition of mesh motion case, it still can not work. Please help me if anyone know how to solve this problem. Thank you so much! John |
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March 3, 2011, 18:45 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
Some details of what you are doing might be useful......
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March 3, 2011, 22:34 |
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#3 |
New Member
John
Join Date: Mar 2011
Posts: 7
Rep Power: 15 |
There are two domains in my fluid model: water and porous. I used mesh motion in water domain. The problem is, even no fsi, just the fluid model itself, it gets overflow all the time. In the output file, all the mesh deformations are 0, which means the mesh is exactly the same with static mesh case.
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March 6, 2011, 17:59 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
So you are saying that you turn mesh motion off and it converges but you turn mesh motion on, but specify zero displacement it diverges?
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March 15, 2011, 22:24 |
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#5 |
New Member
John
Join Date: Mar 2011
Posts: 7
Rep Power: 15 |
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March 16, 2011, 11:54 |
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#6 |
Senior Member
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
Rep Power: 21 |
Make your water slightly compressible.
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