CFD Online Discussion Forums - [Commercial meshers] Fluent mesh to OF conversion

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- - [Commercial meshers] Fluent mesh to OF conversion (https://www.cfd-online.com/Forums/openfoam-meshing/136274-fluent-mesh-conversion.html)

Fluent mesh to OF conversion

Hi,
I am new OpenFoam user and I am trying to convert mesh created in Fluent to OpenFOAM.
Till this time I converted only simple ANSYS meshes and experienced no problems but now I get errors and can't deal with them.

fluent3DMeshToFoam gave errors at the very start, saying something about "not knowing characters".
I switched to fluentMeshToFoam and got veeeery long response in terminal. Finishing with the error I don't understand.

Code:

Create time



"ANSYS(RFound unknown block:(4

Embedded blocks in comment or unknown: (

Found end of section in unknown:)

Found end of section in unknown:)

Dimension of grid: 3

Embedded blocks in comment or unknown: (

Found end of section in unknown:)



(...)



Embedded blocks in comment or unknown:(

Found end of section in unknown:)

Found end of section in unknown:)

Number of points: 14800918



number of faces: 42655130

Number of cells: 13848179

Reading points

Reading points

Reading mixed faces

Reading mixed faces

Reading uniform faces

Reading uniform faces

Reading mixed faces

Reading mixed faces

Reading uniform faces



(...)



Reading mixed faces

Other readCellGroupData: 3 1 4f53 1 0

Reading mixed cells

Other readCellGroupData: 4 4f54 1aaba 1 0

Reading mixed cells

Other readCellGroupData: 12 1aabb 28cbbb 1 0

Reading mixed cells

Other readCellGroupData: 7b 28cbbc 758179 1 0

Reading mixed cells

Other readCellGroupData: e3 75817a a82890 1 0

Reading mixed cells

Other readCellGroupData: e9 a82891 d1bd60 1 0

Reading mixed cells

Other readCellGroupData: ee d1bd61 d34e73 1 0

Reading mixed cells

Read zone2:238 name:wlot_6 patchTypeID:fluid

Reading zone data



Read zone2:233 name:wlot_5 patchTypeID:fluid

Reading zone data



Read zone2:227 name:wlot_4 patchTypeID:fluid

Reading zone data



(...)



Read zone2:2 name:interior-wlot_1-1_wlot_out patchTypeID:interior

Reading zone data



Read zone2:1 name:interior-wlot_1-1_wlot_in patchTypeID:interior

Reading zone data



Found unknown block:(38

Embedded blocks in comment or unknown: (

Embedded blocks in comment or unknown:(

Embedded blocks in comment or unknown:

(

Found end of section in unknown:)



(...)



 Found end of section in unknown:)

Found end of section in unknown:)

Found end of section in unknown:)





FINISHED LEXING





#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#1  Foam::sigSegv::sigHandler(int) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#2   in "/lib/x86_64-linux-gnu/libc.so.6"

#3  

 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/fluentMeshToFoam"

#4  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"

#5  

 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/fluentMeshToFoam"

Segmentation fault (core dumped)

I put "(...)" to shorten the text, it was almost 430 000 characters long.

For clarity, I post the last part again separately:

Code:

#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#1  Foam::sigSegv::sigHandler(int) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"

#2   in "/lib/x86_64-linux-gnu/libc.so.6"

#3  

 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/fluentMeshToFoam"

#4  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"

#5  

 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/fluentMeshToFoam"

Segmentation fault (core dumped)

I don't even know what to focus on.
I didn't create that mesh - all I know about it is:
- it works fine in Fluent,
- it was exported from Fluent as .msh file in ASCII format,
- it was composed from several (~9) meshes created in ANSYS mesher, put altogether in Fluent.

Can anyone help me with that?

Please, any tips? I cannot find anything similar to this case on the forum.

Hello Michal,

my tip is to use fluent3DMeshToFoam.
If you get a message similar to this:

"--> FOAM FATAL ERROR:
Do not understand characters: | on line 5894448,"

you should just remove this character. To do so, this file has to be in ascii format.
Actually msh files can be really big, so don´t open it in order to delete the characters manually.
use this command in your terminal if you want to delete this character "|":
sed 's/|//g' mesh1.msh > mesh2.msh

You can delete any character with this command. e.G. & ---> sed 's/&///g'
If you want to delete "/", don´t type sed '////' but sed /\///. ( \ in front of / )

I hope this helps!

Best regards Tobi

Problem with mesh conversion

I have a .msh file generated with icem and want to convert it to openfoam with fluent3dtofoam.
I already did this a few times and it worked very well.
This time I got the following error message:

Code:



Create time



Dimension of grid: 3

Number of points: 111619

PointGroup: 14 start: 0 end: 111618.  Reading points...done.

Number of faces: 223234

FaceGroup: 15 start: 0 end: 21355.  Reading uniform faces...done.

FaceGroup: 16 start: 21356 end: 24308.  Reading uniform faces...done.

FaceGroup: 17 start: 24309 end: 26339.  Reading uniform faces...done.

FaceGroup: 18 start: 26340 end: 212537.  Reading uniform faces...done.

FaceGroup: 19 start: 212538 end: 214840.  Reading uniform faces...done.

FaceGroup: 20 start: 214841 end: 223233.  Reading uniform faces...done.

Zone: 15 name: OUTLET type: outlet-vent.  Reading zone data...done.

Zone: 16 name: SHROUD type: wall.  Reading zone data...done.

Zone: 17 name: NABE type: wall.  Reading zone data...done.

Zone: 18 name: BLADE type: wall.  Reading zone data...done.

Zone: 19 name: INLET type: velocity-inlet.  Reading zone data...done.

Zone: 20 name: TRAILING-EDGE type: wall.  Reading zone data...done.



FINISHED LEXING



Creating patch 0 for zone: 15 name: OUTLET type: outlet-vent

Creating patch 1 for zone: 16 name: SHROUD type: wall

Creating patch 2 for zone: 17 name: NABE type: wall

Creating patch 3 for zone: 18 name: BLADE type: wall

Creating patch 4 for zone: 19 name: INLET type: velocity-inlet

Creating patch 5 for zone: 20 name: TRAILING-EDGE type: wall

patch 0 from Fluent indices: 0 to: 21355 type: outlet-vent

patch 1 from Fluent indices: 21356 to: 24308 type: wall

patch 2 from Fluent indices: 24309 to: 26339 type: wall

patch 3 from Fluent indices: 26340 to: 212537 type: wall

patch 4 from Fluent indices: 212538 to: 214840 type: velocity-inlet

patch 5 from Fluent indices: 214841 to: 223233 type: wall



--> FOAM FATAL ERROR: 

Illegal cell label -1 in neighbour addressing for face 0



    From function polyMesh::initMesh()

    in file meshes/polyMesh/polyMeshInitMesh.C at line 65.

Does anybody have some experience with this?
I didn´t find this error in google, so I hope here is someone who can help me.
Otherwise I just to do a new mesh with Icem.
Thank you so far.

Best regards
Tobi

Thank you for help, Tobias.

I am doing as suggested (and indeed i wanted to try fluent3DMeshToFoam and delete these characters but simply couldn't open the file - it was too big) but I keep getting errors concerning other characters. As a result I spent a while removing several capitals, brackets, but when it came to the letter 'r' I stopped. These are regular characters and should be understood.

Why does it happen? I am pretty sure that mesh was saved in ASCII format (I saw the 'write as a binary file' box being unchecked).

Well, it seems to me that I solved the problem. Errors were occurring because the mesh was multidomain. The solution and proper conversion method is presented clearly in this topic: http://www.cfd-online.com/Forums/ope...n-problem.html

Hi Michal
I have exactly the same error. Do you have a solution?
Thank you very much in advance.
saba