# wave problem

 Register Blogs Members List Search Today's Posts Mark Forums Read

 February 3, 2010, 03:53 wave problem #1 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 3, 2010, 08:41 #2 Member   Armen A. Ghirghidov Join Date: Mar 2009 Posts: 50 Rep Power: 17 did you use lagrangian VOF method?

February 10, 2010, 06:00
#3
New Member

cloud lin
Join Date: Dec 2009
Posts: 3
Rep Power: 16
Quote:
 Originally Posted by Ghirghidov did you use lagrangian VOF method?
didn't flow-3d always use the method??

 February 10, 2010, 09:37 #4 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.

April 28, 2021, 22:49
#5
New Member

rik houthuys
Join Date: Jan 2017
Posts: 27
Rep Power: 9
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?

 May 3, 2021, 14:22 #6 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.