[bigphil]

Originally Posted by Michael@UW

By the way, to view the deforming process (show the deformed shape), which vector should I use among "U", "pointD", and "pointDD" to warp? It seems "U" and "pointDD" give the same deformation, but they are different from "pointD".

• D is the total displacement
• DD is the increment of displacement i.e. DD = D - D_0
• D_0 is the old-time total displacement
• U is the velocity
• pointD is D interpolated (in the solver) to the mesh points: this interpolation is a but more accurate than the interpolation by ParaView
• similarly pointDD is the point version of DD
  
  So when using "warp by vector", use D or pointD fields (D will be interpolated to the points by ParaView so it should be almost the same as pointD, but pointD is more correct).
  
  Philip