foamMeshToFluent : Error for 2D-axi simulation
Hi Forum!
I'm trying to have a benchmark between OpenFOAM and FLUENT with a very simple burner. It is basically constituted by a circular gas inlet and an annular air inlet which end up in a cylindrical combustion chamber. So my problem is essentially 2D axisymmetric. In order to have the same mesh for OF and FLUENT runs I created the (3D) grid using blockMesh and wedge shaped blocks. First I simulate my burner using reactingFoam and then I exported my 3D grid in .msh format and verified it in FLUENT. Reading this thread I found out that I could obtain a 2D-axisymmetric mesh from my 3D one simply importing it into GAMBIT, deleting the volume and all unnecessary surfaces and then re-exporting it in .msh format... but it doesn't work! :confused: FLUENT can read the file, but GAMBIT doesn't. That seems quite strange... Do anyone know how to manage this? Here's my .msh file. :( .Alex. [P.S.: it would be nice if fluentMeshToFoam could handle axisymmetric meshes from 2D grids..!] |
try this one:
-make 2.5D Case by extruding in the z-dir. -make sure the "symm"-faces are in x-y-plane -make sure every possible node has got a pos. location in x and y -group the front and back face e.g. "FLUID" -name the axis faces e.g. "AXIS" fluent3DMeshToFOAM -*.msh makeAxialMesh -axis AXIS -wedge FLUID collapseEdge 1e-6 180 extract the boundary.gz in ~/2/polyMesh copy everything from 2/polyMesh to constant/polyMesh delete 1/ and 2/ TATA!! ;) P.S.: i wrote myself a small script for handling all of this stuff for a multiregioncase... if somebody needs it drop a mail |
Thank you, neewbie! ;)
This is how I can manage to export my high-quality 2D axisymmetric mesh constructed in GAMBIT in OpenFOAM! Very useful script, I'll drop you a email right now!!! :p Anyway just for this case my problem is the exact opposite: I have a mesh made up using blockMesh (so it is essentially 3D... or 2.5D as you say!) and now I'd like to transform it in a 2D mesh for FLUENT! Si ti possible?? ...Anyway I have to say yours is the best option for mantaining the same node position (mesh invariance) to simulate the same case in FLUENT and OF!! |
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Yes, I tried foamMeshToFluent and now I have a .msh file which I can read and visualize in FLUENT but I can't import in GAMBIT for modifying it as a 2D..!
Mmmh, no, I didn't try flattenMesh... but as far as I know it is useful for flattening the front and back boundaries of a 2D mesh, is it?? :confused: |
sorry,... no idea about gambit. Canīt you go for symmetry in FLUENT, .... i know this isn't solving the problem.
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...Mmmh, no, there are not such mesh manipulation features in FLUENT...
Ok, last scenario: I'll create a quasi-similar mesh in 2D using GAMBIT! But for other cases I will use your suggestions and script: - make the mesh in GAMBIT as 2D; - export it in OpenFOAM making it 2.5-D; - modifying for 2D-axysimmetric simulation. Thank you!!! :) |
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