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Enter expression for Turbulent intensity or turbulent kinetic energy

- June 21, 2021 at 12:06 pm
  
  NimaNZ
  Subscriber
  
  Hi everyone
  
  I want to apply a specific profile for turbulence intensity, dependent on the distance from the ground (y), in the inlet boundary conditions, but here is an error:
  my input for turbulence intensity profile: A*((y/B[m])^(-C))
  and the error is: expression is not single-valued.
  
  I would be delighted to have your advice on this.
  
  Thanks in advance
- June 21, 2021 at 12:39 pm
  
  aitor.amatriain
  Subscriber
  
  If C>0, then the expression is not single valued. You should add some kind real and/or absolute value operators, depending on the values of y, B and C (it is possible to have real/complex and positive/negative roots).
- June 21, 2021 at 12:48 pm
  
  NimaNZ
  Subscriber
  
  Thank you Could you please give me an example of how I can fix this?
  Thanks
- June 21, 2021 at 12:57 pm
  
  aitor.amatriain
  Subscriber
  
  I do not use expressions, but for UDFs, I would use functions as real() or fabs
- June 21, 2021 at 2:38 pm
  
  NimaNZ
  Subscriber
  
  Thanks a million for your help

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