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how is rhoSimpleFoam a compressible steady statefor compressible flow

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Old   September 21, 2016, 09:48
Default how is rhoSimpleFoam a compressible steady statefor compressible flow
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annn
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how can rhoSimpleFoam be a compressible solver and a steady state solver at the same ime?

From what I know (please correct me if I am wrong)
If its a compressible solver it means it takes into account that density is changing.
if its a steady state you don't take time into account.

so there comes my confusion it seems like the two are contradicting each other.
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Old   September 22, 2016, 03:00
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The density can change in space, e.g. due to a certain temperature field present in your geometry. It can be stationary though, if in every single control volume, the density does not change over the time.

Another example: if you consider a steady-state solution for your velocity field, it doesn't mean that your velocity has to be constant in all your simulation domain. If the cross-section of a pipe gets smaller, the flow velocity will increase (assuming incompressible flow). This change in velocity is not connected with the time.

Best regards
Harald
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Old   September 22, 2016, 03:23
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thanks, that makes sense and great name 'hunger'
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