In Fluent, why white squares are spotted in a contour a certain distance away from the wall (ground)

- November 27, 2020 at 5:50 am
  
  mutianzi1
  Subscriber
  
  Hello All,
  
  I was using Fluent to simulate a wind field. After the simulation is done, I tried to display the velocity contour of a curved surface a certain distance from the wall (ground floor). I used [Surface -> Create -> Transform] to define such surface.
  
  However, there are white spots in the contour plot.
- November 27, 2020 at 12:32 pm
  
  Rob
  Forum Moderator
  
  The lines are caused by the surface clipping the edge of a cell rather than being through one entire cell: nothing to worry about and very normal. nThe holes in the surface suggest the transform surface didn't quite work and is missing a few facets. Again, nothing wrong in the model and the results are correct it's just a bit missing from the surface. If you recreate the transform surface fractionally higher in the domain the holes may move or go away: double check you're into at least the 2nd or 3rd cell with the transform. n
- March 19, 2021 at 7:18 am
  
  milanswart
  Subscriber
  
  Thank you for this! I am seeing the same thing when using a transformed terrain surface for contour plots. I was expecting as much, but this thread helps.n

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