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Translational periodicity and compressible flows |
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June 4, 2020, 18:35 |
Translational periodicity and compressible flows
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#1 |
New Member
Join Date: Apr 2020
Posts: 26
Rep Power: 6 |
Background: I am trying to simulate flow over an infinite plate with hemispherical pimples. I reduced my domain to a row of a few hemispherical pimples. I am applying periodic BC in two directions: sideways (pressure drop=0) and from inlet to outlet (specified pressure drop). The top surface is a simple free-slip wall.
Problem: My set-up works fine if I use air with constant properties but as soon as I switch to ideal gas air I get the following error message: "A mass and momentum model can be set for periodic domain interfaces only if all fluids have constant density". Question: Is it possible to model compressible flows with periodic heat transfer through CFX? Thank you in advance. |
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June 5, 2020, 16:21 |
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#2 |
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Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,827
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Of course not.
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July 15, 2020, 13:19 |
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#3 |
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Henrique Stel
Join Date: Apr 2009
Location: Curitiba, Brazil
Posts: 93
Rep Power: 17 |
I presume it is not possible simply because of the concept behind periodic boundary conditions. When you assign two boundaries as periodic, what you are telling the solver is that it has to enforce the velocity field on both boundaries to be equivalent, for a given pressure drop between them. How can the velocity field be equivalent between inlet and outlet if the flow is compressible (given that mass has to be conserved)?
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Tags |
cfx, compressible, heat transfer, periodicity |
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