Okay, I'll be the first to admit I'm more adept at Flow than Simulation, so...
I would like to define a new parameter for post-processing. In a series of simulations I have either tension or compression but rarely any shear. So instead of using a separate P1 and P3 plot I'd like to make a parameter that is P1+P3. Not intensity (P1-P3) because that always gives you a postive value, I want to be able to see whether it is tensile or compressive.
So I go to "Add Parameter" and try to input this. But I can't find a list of the built-in variables you are allowed to use. All I want to do is P1+P3. Should be easy enough.
Hints or suggestions?