Wall contact in interTrackFoam

virginie_e · March 5, 2009, 08:01

Hello,

I would have liked to ask what kind of boundary condition I should set on a wall where there is a triple point (limit between my fluid and air). I would like this triple point to move naturally during the simulation. I saw in another thread that the slip condition for motionU worked if the wall was flat. But, what if it is not flat?

Thank you in advance.

Virginie

deepsterblue · March 5, 2009, 09:45

I think the slip BC takes point-normal information from each patch and uses that to zero-out the forces in that direction at the motion-solver level.

If this is indeed the case, then I guess the slip boundary should work even on a non-planar wall. But I would be a little concerned if mass-conservation is a priority in your simulation - moving points on a non-planar surface tends to develop minor errors in domain-volume over time.

There's only one way to find out - try it!

akidess · November 8, 2011, 11:52

Virginie, have you continued your work with interTrackFoam? If so, did you experience any problems with wall contact?

March 5, 2009, 08:01	Hello, I would have liked	#1
virginie_e Member Virginie Ehrlacher Join Date: Mar 2009 Posts: 52 Rep Power: 18	Hello, I would have liked to ask what kind of boundary condition I should set on a wall where there is a triple point (limit between my fluid and air). I would like this triple point to move naturally during the simulation. I saw in another thread that the slip condition for motionU worked if the wall was flat. But, what if it is not flat? Thank you in advance. Virginie

March 5, 2009, 09:45	I think the slip BC takes poin	#2
deepsterblue Senior Member Sandeep Menon Join Date: Mar 2009 Location: Amherst, MA Posts: 403 Rep Power: 26	I think the slip BC takes point-normal information from each patch and uses that to zero-out the forces in that direction at the motion-solver level. If this is indeed the case, then I guess the slip boundary should work even on a non-planar wall. But I would be a little concerned if mass-conservation is a priority in your simulation - moving points on a non-planar surface tends to develop minor errors in domain-volume over time. There's only one way to find out - try it! __________________ Sandeep Menon University of Massachusetts Amherst https://github.com/smenon

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November 8, 2011, 11:52		#3
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 30	Virginie, have you continued your work with interTrackFoam? If so, did you experience any problems with wall contact?