Hello,nA couple of pointers:nTo debug the UDF, try to test it on with a simpler problem (perhaps a 2D version). What you want to make sure is that the UDF is compiling correctly and the prescribed motion is working.nMake sure that the initial starting mesh is of good quality. If this mesh quality is poor to start with, you will always end up with issues.nWhat are your Dynamic Mesh settings? Are you using Remeshing? Which faces are you applying this setting to?nKarthikn
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