Learning Forum

[NimaNZ]

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

[aitor.amatriain]

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).

[NimaNZ]

Thank you Could you please give me an example of how I can fix this?
Thanks

[aitor.amatriain]

I do not use expressions, but for UDFs, I would use functions as real() or fabs

[NimaNZ]

Thanks a million for your help