Surface roughness and y+

- November 16, 2023 at 1:24 pm
  
  Lisa Svensson
  Subscriber
  
  Hi!
  I have added surface roughness into my k-omega SST model, and I'm unsure about how to interpret the y+ value. For a smooth pipe, it should be around 1, and with the added roughness I can't get it below 20. I've tried searching online, but I can only find information about wall functions, not specifically for being in the viscous layer.
  I would greatly appreciate some insight into this or if anyone knows where I can find information about this!
  Thanks!
- November 17, 2023 at 2:29 pm
  
  Federico Alzamora Previtali
  Ansys Employee
  
  y+ is shifted when surface wall roughness is introduced, making it difficult to reach values near y+~1.
  You can read on this here: 7.4.15.3.1 Standard Law-of-the-Wall Modified for Roughness (ansys.com)

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