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the grids doesn't move in dynamic mesh

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Old   July 4, 2008, 18:51
Default the grids doesn't move in dynamic mesh
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i have made a rectangular model. the uper face is moving down by hooking a dynamic-grid-motion. but after some iterations the error occurs that the fluent identifies negative valoume. so when i check the grids, they doesn't move down with the upper face. the side faces are deforming zone and the down face is stationary. can somebody help me?
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