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Deforming surfaces changes its plane feature when side walls moving !

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Old   September 28, 2012, 09:48
Default Deforming surfaces changes its plane feature when side walls moving !
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I am using dynamic mesh to simulate expanding cylinder. Cylinder walls are expanding and moving in circular motion at the same time. Cylinder side walls are moving fine using DEFINE_GRID_MOTION, and the top and bottom walls which are planes are set to deforming faceted. When deforming the top and bottom walls shape start to change their shape to look a bit more like a dome or hat, and do not stay flat as they should be!
Any suggestions to solve this problem would be very much appreciated
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