how to create pressure coefficient expression in CFD-Post?

- April 16, 2022 at 11:27 am
  
  aram.alizadegan
  Subscriber
  
  Hi every one
  I am working on a tall building CFD and I have to validate my results. so I need to compare Cp (pressure coefficient) of some points on building with experimental results. I have create points and for creating Cp expression I enter this formula into Expression:
  (Pressure-Reference Pressure)/(0.5* areaAve(Density)@inlet * areaAve(Velocity)@inlet^2)
  But it gives an error with this description:
- April 18, 2022 at 3:21 pm
  
  SVV
  Ansys Employee
  
  Hi Can you please look into the definition of Reference pressure again. I guess the Reference pressure is not defined correctly.
- April 19, 2022 at 5:55 am
  
  aram.alizadegan
  Subscriber
  
  thank you for your response
  the problem is that there is no reference pressure expression in expressions. I checked older version of Ansys (18) and in that version, by default, the reference pressure expression has been created.
  So I created a reference pressure expression by my self, but when I want to use the variable which uses Pressure Coefficient it gives this error!
  I don't know how can I solve this problem!