Case check - Velocity-Inlet not compatible with compressible flows
 

Fluent case-check reports: Change inlet boundary conditions. Velocity-Inlet boundary conditions are not compatible with compressible flows.

Actually there's no compressible flow defined. Defined fluid is a mixture consisting of hydrogen and carbon-dioxyde, both with constant density and volume-weighted-mixing-law defined for the mixture.

Does anybody know the reason for this problem?

kind regards:)

In the available materials in fluid panel air is still there (as default). Maybe there you set compressible density before.

Thanks for your fast answer, but i think you didn't get the problem. Maybe my description was bad.

The problem does not concern the fluid or mixture, i don't understand the cited case-check message from fluent, because there doesn't exist any compressible flow in the domain.