wave problem

nchu286 · February 3, 2010, 03:53

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

Ghirghidov · February 3, 2010, 08:41

did you use lagrangian VOF method?

nchu286 · February 10, 2010, 06:00

Quote:

Originally Posted by Ghirghidov

did you use lagrangian VOF method?

didn't flow-3d always use the method??

MuxaB · February 10, 2010, 09:37

Could it be because a reflected wave came back to the wave boundary? What do you have as BC on other mesh boundaries?

Houthuys · April 28, 2021, 22:49

Quote:

Originally Posted by MuxaB

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?

MuxaB · May 3, 2021, 14:22

You need to figure it out by playing with the sponge layer parameters and mesh dimension. No much I can do from here.

February 3, 2010, 03:53	wave problem	#1
nchu286 New Member cloud lin Join Date: Dec 2009 Posts: 3 Rep Power: 16	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

February 10, 2010, 09:37		#4
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 336 Rep Power: 18	Could it be because a reflected wave came back to the wave boundary? What do you have as BC on other mesh boundaries? Houthuys likes this.

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February 3, 2010, 08:41		#2
Ghirghidov Member Armen A. Ghirghidov Join Date: Mar 2009 Posts: 50 Rep Power: 17	did you use lagrangian VOF method?

May 3, 2021, 14:22		#6
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 336 Rep Power: 18	You need to figure it out by playing with the sponge layer parameters and mesh dimension. No much I can do from here.