# Problem with BC inconsistency

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 April 26, 2005, 14:13 Hi everybody, I want to per #1 Member   David Segersson Join Date: Mar 2009 Posts: 39 Rep Power: 8 Hi everybody, I want to perform calculations for a square box, using simpleFoam, with flow from several different directions (one direction at a time). To perform calculations for flow coming from the "south east" direction, I need to have an inlet bc at both the south and the east boundary patches, and outlet conditions for the north and west boundary patches. For the upper boundary i use symmetry bc and the lower has a wall bc. This setup gives me an error at execution, with a message telling me that my patch type is inconsistent with my boundary patch etc... I've used this setup many times in Fluent, so I'm a little surprised it didn't work here. Does anybody know what I'm doing wrong? /David

 April 26, 2005, 14:18 Sorry for being blunt, but how #2 Senior Member   Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,758 Rep Power: 21 Sorry for being blunt, but how did you imagine that the code will allow you to specify an outlet boundary condition on a patch that you specified as a symmetry plane? The patch is either a symmetry plane, in which case the b.c. for ALL variables is symmetryPlane, or it is not and symmetry plane and you can set up any boundary condition you like. If you still don't see it, please take a piece of paper, draw the symmetry plane boundary and try to figure out how should the flow come out of it. Enjoy, Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

 April 26, 2005, 17:21 When you say "square box" do y #3 Senior Member   Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 12 When you say "square box" do you mean a cube or a 2-D square? Assuming you are referring to a cube with diagonal cross-flow parallel to the wall and symmetry plane, there is no reason why it should not work. Maybe you should post the entire error message?

 April 27, 2005, 11:39 Hi again, Sorry if I was uncl #4 Member   David Segersson Join Date: Mar 2009 Posts: 39 Rep Power: 8 Hi again, Sorry if I was unclear, I meant a cube with cross diagonal flow. The error message is: ... Create mesh for time = 0 Reading field p --> FOAM FATAL IO ERROR : inconsistent patch and patchField types for patch type symmetryPlane and patchField type fixedValue file: /home/OpenFOAM/OpenFOAM/OpenFOAM-1.0.2/run/simpleBuilding/0/p::north from line 41 to line 43. Function: fvPatchFieldconst fvPatch&, const Field&, const dictionary &) in file: /home/dm2/henry/OpenFOAM/OpenFOAM-1.0.2/src/OpenFOAM/lnInclude/newFvPat chField.C at line: 139. FOAM exiting The case works just fine when using just one inlet boundary and one outlet (the boundaries parallell to the flow are then set to symmetry). Any ideas? /David

 April 27, 2005, 11:46 As I've answered above, you ha #5 Senior Member   Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,758 Rep Power: 21 As I've answered above, you have defined the patch type to be symmetryPlane and the boundary condition to be fixedValue, which is not allowed: - if you want a symmetry plane, define the b.c. on p to be symmetryPlane - if you want fixedValue, define the patch type to be "wall" or "patch". Now read the error message again - if you think it is unclear, please let me know what you'd like it to say and I will change it. Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

 April 28, 2005, 12:34 Ok, now it works. I didn't kn #6 Member   David Segersson Join Date: Mar 2009 Posts: 39 Rep Power: 8 Ok, now it works. I didn't know the difference between the patch type and the physicalType... Changing the type in ../polyMesh/boundary from symmetryPlane to patch solved it. Thanks for having patience with a beginner //David

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