[McFly]

Hello,

I have been trying to convert a Fluent .cas file (saved in ASCII) for use in OpenFOAM 2.1.1. The mesh has been adapted in Fluent and has hanging nodes, so there is no mesh file. I'm not sure if this is the problem.

The first error message when converting the case file is usually something like:

--> FOAM FATAL ERROR:
Do not understand characters: |
    on line 4337

    From function fluentMeshToFoam::lexer
    in file fluent3DMeshToFoam.L at line 748.

FOAM exiting

So the file was edited with a text editor (EditPadLite7, as the ASCII file is 1GB size) to remove the offending characters (the “|” symbol). This could be done as these were not part of the mesh data. The conversion process then gets a bit further until this error:

--> FOAM FATAL ERROR:
15 not found in table.  Valid entries:
13
(
1
2
3
4
5
6
7
8
9
10
11
12
14
)

Looking at the case file there are 14 zones specified. I can add at 15th, such as is done in this thread. This means finding the area in the .cas file:

(39 (14 interior default-interior 1)(
 (is-not-a-rans-les-interface . #t)
))

And adding another zone:

(39 (14 interior default-interior 1)(
 (is-not-a-rans-les-interface . #t)
))
(39 (15 interior bananas 1)(
 (is-not-a-rans-les-interface . #t)
))

With this modification fluent3DMeshToFoam runs, and completes without further errors. However, running checkMesh on this case fails with a bunch of errors that look like this:

Checking topology...
    Boundary definition OK.
--> FOAM Serious Error : 
    From function bool zone::checkDefinition(const label maxSize, const bool report) const
    in file meshes/polyMesh/zones/zone/zone.C at line 211
    Zone bananas contains invalid index label 1009794

... <SNIP> ...

--> FOAM FATAL ERROR:
Too many errors

If, instead of adding zones in the .cas file, one merely changes the last zone to 15:

(39 (15 interior default-interior 1)(
 (is-not-a-rans-les-interface . #t)
))

then errors such as this occur:

Zipping mesh to remove hanging nodes
--> FOAM Warning : 
    From function void polyMeshZipUpCells(polyMesh& mesh)
    in file polyMeshZipUpCells/polyMeshZipUpCells.C at line 697
    Duplicate point found in the new face. 
Point: 39132 face: 8(31989 31543 31542 34169 31542 51478 39132 51483)

Does anyone have any thoughts as to why this cannot be converted? Is it just the hanging node issue?