This panel allows you to perform basic postprocessing calculations.
Normally output from solvers consists only of the basic fields like pressure, velocity and temperature. It is often necessary to obtain certain derived fields and values. This values can be obtained in the Calculate panel.
There are three basic types of postprocessing calculations:

Fields – calculates derived fields such as Mach number or vorticity

Wall – calculates derived fields that are important only on walls, such as y⁺.

Boundary – calculates values at any mesh boundary
All the calculations can be performed on demand using the Calculate button. This button will not be active when there are no results available or the simulation is still running.