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wave problem

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Old   February 3, 2010, 03:53
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cloud lin
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i tried to produce a very simple wave (input wave amplitude,period,and fluid height)and wanted to see the free surface elevation at the most front-end
.I run 100s and the first 40s the elevation is a regular wave but after it ,it suddenly climb it high and became irregular .
So did anyone know where is the problem.Thx
Ps:the fluid is one fluid ,linear
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Old   February 3, 2010, 08:41
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Armen A. Ghirghidov
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did you use lagrangian VOF method?
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Old   February 10, 2010, 06:00
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cloud lin
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did you use lagrangian VOF method?
didn't flow-3d always use the method??
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Old   February 10, 2010, 09:37
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michael barkhudarov
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Could it be because a reflected wave came back to the wave boundary? What do you have as BC on other mesh boundaries?
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Old   April 28, 2021, 22:49
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Quote:
Originally Posted by MuxaB View Post
Could it be because a reflected wave came back to the wave boundary? What do you have as BC on other mesh boundaries?
I think this is always the reason. What is the possible solution?

I know that flow-3d implements the sponge layer at the outflow boundary. But even with this active, I still have some reflection from the boundary.

Any suggestions?
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Old   May 3, 2021, 14:22
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michael barkhudarov
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You need to figure it out by playing with the sponge layer parameters and mesh dimension. No much I can do from here.
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