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[Commercial meshers] Conversion Fluent cas and dat file to OpenFoam |
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#1 |
Guest
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Hi to all,
sorry for my english; I am a newbie of OpenFoam. I have obtained several results for my problem with Fluent and now I want to work with OpenFoam using intermediate results obtained in Fluent so I want to convert .cas and .dat files to Openfoam files. I tried to use fluentMeshToFoam: it works very well with .msh file but it doesn't work with .cas and .dat files. Is it possible? Do you know some utility which do that? I want to use OpenFoam because I have the possibility to exploit a linux based pc with more RAM and so I can refine the mesh and I hope to obtain better results. So,is the tool to refine the mesh present in OpenFoam good? Is there an open source or freeware program for linux that do a refine of the mesh with a GUI? Thaks in advance, Matteo Gautero. |
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#2 |
Member
Francesco Boschetto
Join Date: Mar 2009
Location: Italy
Posts: 56
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Hi Matteo,
I've used fluentMeshToFoam with some .cas files and everything was ok. Which kind of errors do you have? Regards Francesco |
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#3 |
Senior Member
Florian Krause
Join Date: Mar 2009
Location: Munich
Posts: 103
Rep Power: 17 ![]() |
Hi Matteo,
when I use fluentMeshToFoam to convert a fluent .cas file (only mesh information) I have no problems. But as I understand you correct, you want to convert your results (.cas and .dat files), than refine the mesh and run the job with OF? This conversion would be a result and mesh conversion but fluentMeshToFoam only works for mesh conversion. Somebody might correct me if I am worng regarding the fluentMeshToFoam converter Regards, Flo |
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#4 |
Senior Member
Francesco Del Citto
Join Date: Mar 2009
Location: Zürich Area, Switzerland
Posts: 237
Rep Power: 18 ![]() |
Hi Matteo,
you must save case as ascii to let the compiler work. And if the mesh is 3D, my suggestion is to use fluent3DMeshToFoam. About data file, I'm not aware about a converter... You can do the other way round, with foamDataToFluent (and foamMeshToFluent for the mesh). Regards, Francesco |
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#5 |
Guest
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Hi to all,
thanks for your answers. Yes Florian, I want to convert my results and than refine the mesh and run the case with OF. When I try to do this, the message error is: Embedded blocks in comment or unknown: ( Found end of section in unknown ![]() for several lines and then OF print this message: Number of cells: 736991 number of faces: 1524374 Number of points: 148787 0Dimension of grid: 12 (Dimension of grid: 2 Dimension of grid: 1 bDimension of grid: 3 edfDimension of grid: 1 Dimension of grid: 2 0Dimension of grid: 13 (Dimension of grid: 3 Dimension of grid: 1 Dimension of grid: 622 Dimension of grid: 24 Dimension of grid: 3 after this, OF stops. I think it's not possible to convert a .cas file after some iterations. So I will redo the itereations with the refined grid obtained by the first mesh used in Fluent. Anyway, I will try to convert the first .cas file containing the boundary conditions imposed in Fluent without iterations. Thanks, Matteo Gautero. |
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#6 |
Senior Member
Francesco Del Citto
Join Date: Mar 2009
Location: Zürich Area, Switzerland
Posts: 237
Rep Power: 18 ![]() |
No, that's not true.
There is no conceptual difference between a Fluent cas file at "0" iterations and another one saved after a while. With respect to the .msh file, the .cas file contains some extra fields that the converter usually skips. As I wrote before, you MUST save your .cas file in ASCII, otherwise the converter doesn't work, and sometimes remains blocked without giving any outoput... Francesco |
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#7 |
Guest
Posts: n/a
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Hi Francesco,
you're right. I tried to do what you said and it worked very well. The first messages were errors, i.e. Embedded blocks in comment or unknown ( Found end of section in unknown ) Found end of section in unknown ) but then OF read the grid and I visualized it, it was ok. Thanks to all for these explanations, Matteo. |
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#8 |
Member
Michael Rangitsch
Join Date: Mar 2009
Location: Midland, Michigan, USA
Posts: 31
Rep Power: 17 ![]() |
I'm having problems processing a .cas file that I had run fluent on and then did a grid refinement to tighten up the grid in the boundary layer (it resulted in hanging grids). fluent3dmeshtoFoam won't process it at all -- gives me an illegal block type 37 -- that's the label on a block of text in the case file which describes the fluent models used... Any ideas?
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#9 |
Senior Member
Dragos
Join Date: Mar 2009
Posts: 648
Rep Power: 20 ![]() |
As far as I know, grid refinement in fluent means hanging nodes, which fluent3DMeshToFoam doesn't know how to interpret.
Dragos |
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#10 |
Senior Member
Francesco Del Citto
Join Date: Mar 2009
Location: Zürich Area, Switzerland
Posts: 237
Rep Power: 18 ![]() |
fluent3DMeshToFoam is able to handle hanging nodes (fluentMeshToFoam isn't).
If it finds an unknown block, try to open the .cas file with a text editor end remove the corresponding lines. In a fluent mesh file, each block is enclosed by ( ). Good luck! |
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#11 |
New Member
Aga
Join Date: Mar 2011
Posts: 5
Rep Power: 15 ![]() |
Dear all
I tryo to save the .cas file in ASCII and convect to openfoam. But I fail The message is Found end of section in unknown ![]() Embedded blocks in comment or unknown ![]() Found end of section in unknown ![]() Found end of section in unknown ![]() Found unknown block in zone ![]() Found end of section in unknown ![]() Found unknown block in zone ![]() Found end of section in unknown ![]() Found unknown block in zone ![]() Found end of section in unknown ![]() FINISHED LEXING Could you help me how to solve it? ps: My openfoam is windows version thanks |
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#12 |
Senior Member
TWB
Join Date: Mar 2009
Posts: 402
Rep Power: 19 ![]() |
Hi lcweng,
I got the same problem as yours. The case file was from a newer ver of Fluent. I tried to load the cas file in v16.2 and write it out in ascii and now it worked. Maybe u can try it. Thanks. |
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