# How to use movingWallVelocity the right way?

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 May 16, 2012, 11:40 How to use movingWallVelocity the right way? #1 Member   fisch Join Date: Feb 2010 Posts: 97 Rep Power: 9 Sponsored Links Hi, i have a question regarding the movingWallVelocity BC: In my calculations i compare two different setups using the velocityLaplacian meshMotion solver: A) Use the same dirichlet velocity BC at the moving wall as the velocity in my cellMotion U file (such that in my interpretation the relative velocity is zero). B) Use the movingWallVelocity (0,0,0) BC and use the same cellMotion U velocity as in case A) As i understand these pair of calculations should lead to the same result. But as you can guess now they don't. Do you have any suggestions? thanks a lot

March 6, 2013, 12:33
#2
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Teng Wu
Join Date: Feb 2012
Posts: 9
Rep Power: 7
Quote:
 Originally Posted by fisch Hi, i have a question regarding the movingWallVelocity BC: In my calculations i compare two different setups using the velocityLaplacian meshMotion solver: A) Use the same dirichlet velocity BC at the moving wall as the velocity in my cellMotion U file (such that in my interpretation the relative velocity is zero). B) Use the movingWallVelocity (0,0,0) BC and use the same cellMotion U velocity as in case A) As i understand these pair of calculations should lead to the same result. But as you can guess now they don't. Do you have any suggestions? thanks a lot
Dear fisch,

Recently I have the same confusion as you proposed. I'm wondering have you figured it out?

Thanks,

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