about " Environmental conditions"

[nanachen]

What circumstances need to set the project "Environmental conditions"?

[Jon.Wilde]

Mainly for compressible analyses or perhaps where you want to have a P=0 in your model but then have CFD have a different ambient abs pressure to standard (which as you can see, is the default).

Are you running a model where you thought you might need to change it?

[Royce_adsk]

For natural convection analysis the temperature is used for the reference density calculation so it should also be changed.

Pressure is adjusted to align with what a 0 pressure gage would be in the absolute sense.

[nanachen]

Thanks to help. Pressures set I already know
But I used to analyze natural convection project of electronic systems, changing environmental conditions of temperature setting does not affect the result.
Mainly temperature boundary conditions only has an impact on the results.
I do not know how to  this set for customers.