[Wingman]

ANSYS Fluent manual states:
For all flows, ANSYS Fluent solves conservation equations for mass and momentum. For flows involving heat transfer or compressability, an additional equation for energy conservation is solved.

But why does it activate the Energy equation when using Incompressible-Ideal-Gas ?

Fluent comments:
Note: Enabling energy equation as required by material density method.

Is it cause the density can change due to temperature change?

[Wingman]

Can anyone help me on this?

[Wingman]

I can't find anything about this anywhere. Is there anyone who knows this stuff?

Thanks in advance

[abdullahkarimi]

Originally Posted by Wingman

ANSYS Fluent manual states:
For all flows, ANSYS Fluent solves conservation equations for mass and momentum. For flows involving heat transfer or compressability, an additional equation for energy conservation is solved.

But why does it activate the Energy equation when using Incompressible-Ideal-Gas ?

Fluent comments:
Note: Enabling energy equation as required by material density method.

Is it cause the density can change due to temperature change?

When you select Incompressible-Ideal-Gas, it means density would change with temperature. That's why you need to solve energy equation.