# Fix liquid between walls

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 February 23, 2007, 18:43 Fix liquid between walls #1 Tany Guest   Posts: n/a I have a set-up where the two finite horizontal parallel plates have liquid between them. The bottom plate moves. I want the liquid to be fixed as originally patched at the top plate. Basically, i do not want water to move with the plate. Any ideas?

 February 26, 2007, 15:17 Re: Fix liquid between walls #2 Seeker Phil Guest   Posts: n/a Hi, If I understand you right, you do not want the liquid that is adjacent to the top plate to move with the movement of the bottom plate? I guess as long as you have a no-slip condition at the top wall, it will not move with the bottom plate. You will however have a parabolic velocity profile between the plates. The liquid in between will move. Is this what you meant to ask? Phil

 February 26, 2007, 15:19 Re: Fix liquid between walls #3 Seeker Phil Guest   Posts: n/a If on the other hand, you are looking at the liquid adjacent to the bottom plate and trying ensure it does not move with the plate, you might want to force a free slip condition (0% friction) at that plate boundary. Phil

 February 26, 2007, 15:25 Re: Fix liquid between walls #4 Tany Guest   Posts: n/a I have no-slip at the top & bottom walls. But, it still does move after a while at the top plate (though the boundary layer near the bottom moves faster). Thanks for the response. Any ideas?

 February 26, 2007, 15:28 Re: Fix liquid between walls #5 Tany Guest   Posts: n/a I do not mind the liquid near the bottom moving. However, it should stop moving after a while (even though the bottom plate moves). But, I do not want the top layer of water to move at all. How do I impose free slip condition (0% friction)? Shall i do it on the top plate instead? Thanks Again

 February 26, 2007, 16:12 Re: Fix liquid between walls #6 Tany Guest   Posts: n/a On second thought Shouldn't it be maximum friction (and not 0 friction) if i want the liquid to be fixed to the plate?

 February 27, 2007, 12:05 Re: Fix liquid between walls #7 Seeker Phil Guest   Posts: n/a Well yeah, no slip corresponds to a friction coefficient of 1 And free slip a condition of 0 One suggestion could be to look more closely at your boundary layer meshing scheme. You might want to put in a few more grid points there. The only other way I can think of is to "artificially" make the water more viscous. You can change the viscosity, but be aware that this will also change the physics! -Phil

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