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Periodicity and symmetry boundary condition

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Old   June 19, 2014, 12:13
Default Periodicity and symmetry boundary condition
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Luis Delgado
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I have a simple question: What is the difference between periodicity boundary condition and symmetry boundary condition. Thanks.
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Old   June 20, 2014, 04:17
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For a periodic boundary condition you need two faces. Everything that leaves the domain through face A will directly enter the domain through face B.
Symmetry boundary condition means, that everything is symmetric at that face, which means a zero gradient for some values (Temperature, density, pressure, ...). All fluxes are zero here.
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boundary conditions, periodicity, symmetry

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