I want to evaluate pressure and viscous forces separately in CFD-Post. How do I do this?
The 'force' command in the Function Calculator calculates a combined force (pressure+viscous) on surfaces.
To calculate forces due to pressure and viscous stresses separately, the following form can be used:
For pressure forces in the x-direction on ¬'region¬':
For viscous forces in the x-direction on ¬'region¬':
areaInt(Wall Shear X)@region
Note that the relative pressure, p, was used in the above expressions which is consistent with the default behaviour of the ¬'force¬' command. If the reference pressure is non-zero, and the force based on the absolute pressure is desired, use pabs instead of p in the pressure force expression (e.g. areaInt_x(pabs)@region).