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Slip vs. Symmetry boundary condition

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Old   March 6, 2015, 13:57
Default Slip vs. Symmetry boundary condition
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Madeleine P. Vincent
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Hi all,

I am interested in the difference in OpenFOAM between a slip and a symmetry boundary condition for simpleFoam and pisoFoam, version 2.2.

Specifically, this is for a far field edge that should see flow almost entirely parallel to the wall. In this case I am looking at steady, incompressible flow, though later I will be looking at unsteady.

Does OpenFOAM calculate the two boundary conditions differently?

In this post:

http://www.cfd-online.com/Forums/ope...condition.html

it says that they are treated identically (except for perhaps pre- and post-processing).

However, when I switch my far-field BC's to slip from symmetry, the results are slightly different (in this case using simpleFoam). Thus I don't agree with the statements made in the post above.

[Perhaps OF has changed since that post was made, which would be an explanation.]

Does anyone have a good explanation?

Thanks,
Madeleine.
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Old   December 20, 2016, 07:38
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Marija Bervida
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Dear all,

I am also interested in answer, so if anybody can explain it it would be nice.

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Old   December 20, 2016, 11:07
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Alexey Matveichev
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Hi,

Just take a look at two files:

1. $FOAM_SRC/finiteVolume/fields/fvPatchFields/basic/basicSymmetry/basicSymmetryFvPatchField.H
2. $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/slip/slipFvPatchField.H

slip is a child of basicSymmetry.

"the results are slightly different" from the post you are reviving means nothing without concrete numbers and figures.
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