I'm trying to run a what if analysis in flow simulation looking at temperature, pressure and relative humidity. When I go to select my input variables I can see Pressure and Temperature, but not option to tick the Relative Humidity. In the base simulation setup I've ticked the humidity option in my fluids under general settings.
Is there something else I need to do to enable RH for the what if analysis?
Does anyone have any experience with this, I've only used the what if analysis sparingly in the past.