turbulence intensity profile, wind flow

- July 27, 2023 at 6:02 pm
  
  Rosa Richárd
  Subscriber
  
  Hi!
  
  I want to simulate wind flow over a tensile membrane structure. From the EUROCODE (or from different standards) I have the velocity and turbulence intensity profilem which I would like to use in the numerical calculation as a boundary condition at the inlet surface. However, for some reason I cannot define the turbulence intensity profile, as I get the following warning: 'expression is not single-valued'. Any idea how could I solve this problem?
- July 28, 2023 at 8:45 am
  
  Rob
  Ansys Employee
  
  It's been reported before, and is being looked into. The intensity is a % in the panel and between 0 and 1 from an expression.
  I think a UDF (DEFINE_PROFILE) will work otherwise it's more usual to set k and e/w depending on the turbulence model. There are papers with the atmospheric boundary layer profiles, we tend to use the one by Hoxey (I think - I've lost the reference).

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