Y plus

- June 4, 2020 at 10:56 am
  
  Mac123
  Subscriber
  
  What exactly is Y plus ?
  
  Is it the minimum distance from the wall to get an accurate value of the drag value ?
  
  Change the mesh ?
  
  Why ?
- June 4, 2020 at 11:32 am
  
  DrAmine
  Ansys Employee
  
  dimensionless distance of the first cell centroid to the wall. I recommend doing some tutorials, readin some text books and visiting our online documentation.
- June 4, 2020 at 12:10 pm
  
  Mac123
  Subscriber
  
  Yes ,
  
  I have gone through a couple of books .
  
  Is it preferred to have the cell centroid in the viscous sub layer region or the log layer ?
- June 4, 2020 at 1:16 pm
  
  DrAmine
  Ansys Employee
  
  I think you did not go through the documentation.
  
  From pragmatic point of view and as you are looking to drag: better to have a well resolved boundary with at least 10-15 cells and the first cell to have yplus almost one. Moreover the surface should be also be refined stream-wise and in the lateral direction. Please use SST turbulence model.

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