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March 6, 2015, 14:57 |
Slip vs. Symmetry boundary condition
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#1 |
New Member
Madeleine P. Vincent
Join Date: May 2011
Posts: 29
Rep Power: 15 |
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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December 20, 2016, 08:38 |
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#2 |
New Member
Marija Bervida
Join Date: Mar 2016
Location: Slovenia
Posts: 9
Rep Power: 10 |
Dear all,
I am also interested in answer, so if anybody can explain it it would be nice. Regards
__________________
*Things are not what they seem; nor are they otherwise.* |
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December 20, 2016, 12:07 |
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#3 |
Senior Member
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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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boundary conditions, slip, symmetry |
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