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Old   October 7, 2019, 11:17
Smile converting fluent .msh file to openfoam
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Lauren Johnston
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Hi,

I have a .msh file which opens in fluent but I am getting the following error message when I try to convert the fluent file to openfoam:


--> FOAM FATAL IO ERROR:
Attempt to get back from bad stream

file: IStringStream.sourceFile at line 0.

From function bool Foam::Istream::getBack(Foam::token&)
in file db/IOstreams/IOstreams/Istream.C at line 56.

FOAM exiting


I am using the following command in openfoam:

fluentMeshToFoam <mesh_file>.msh


(I am using OF version 6)

Any help would be much appreciated!

Lauren
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Old   October 7, 2019, 19:27
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Svetlana Tkachenko
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How did you create the .msh file?
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Old   October 8, 2019, 03:38
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Piotr Ładyński
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If it's a 3d mesh try
Code:
fluent3DMeshToFoam <mesh_file>.msh 
https://openfoamwiki.net/index.php/Fluent3DMeshToFoam


If the mesh was created on Windows try to convert this to Unix formatting first:
Code:
dos2unix <mesh_file>.msh

Last edited by piotr.mecht; October 8, 2019 at 03:44. Reason: one more tip
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Old   October 8, 2019, 04:21
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Lauren Johnston
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Hi,

I meshed the geometry in VMTK
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Old   October 8, 2019, 04:22
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Lauren Johnston
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Quote:
Originally Posted by piotr.mecht View Post
If it's a 3d mesh try
Code:
fluent3DMeshToFoam <mesh_file>.msh 
https://openfoamwiki.net/index.php/Fluent3DMeshToFoam


If the mesh was created on Windows try to convert this to Unix formatting first:
Code:
dos2unix <mesh_file>.msh
I have also tried the command

fluent3DMeshToFoam but I get the following message:

--> FOAM FATAL IO ERROR:
wrong token type - expected int64_t, found on line 0 the word 'a'

file: IStringStream.sourceFile at line 0.

From function Foam::Istream& Foam:perator>>(Foam::Istream&, int64_t&)
in file primitives/ints/int64/int64IO.C at line 62.

FOAM exiting


The mesh was created in VMTK on a linux PC.
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Old   October 8, 2019, 15:04
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Piotr Ładyński
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Quote:
Originally Posted by laurenj95 View Post
--> FOAM FATAL IO ERROR:
wrong token type - expected int64_t, found on line 0 the word 'a'

IStream errors are due to input variable incompatibilities. This one e.g. expects some number in the first read line, but it gets some word beginning from the letter 'a'.

Can you copy your mesh file header with some first lines? It should look a bit like (opened in some text editor):
Code:
(0 grid written by ANSYS Meshing
    nodes:        (10 (id start end type)    (x    y    z    ...))
    faces:        (13    (id start end type elemType) (v-0 v-1 .. v-n right cell left-cell ...))
    cells:        (12 (id start end type elemtype))
    parent-face (59 (start end parent child) (nchilds child0 child1 ...))

)
(2 3)
(10 (0 1 3d00 0))
(13 (0 1 ac6a 0))
(12 (0 1 37dd 0))
(10 (4 1 32dc 1 3))(
Is it written with ASCII? OpenFOAM converters do not accept binary input. Are you sure it is Fluent mesh? GMSH also uses *.msh extension
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Old   October 9, 2019, 06:27
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Lauren Johnston
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Here is the first few lines of my .msh file:


(0 "GAMBIT to Fluent File")
(0 "Dimension:")
(2 3)

(10 (0 1 691ef 1 3))
(10 (1 1 691ef 1 3)(
-1.2803401947e+01 -1.3421555519e+01 -5.0188274384e+01
-1.3403158188e+01 -1.3795591354e+01 -4.9609939575e+01
-1.3658709526e+01 -1.3156168938e+01 -5.0240833282e+01
1.1650079489e+00 -4.0743322372e+00 -4.4399948120e+01
1.3966637850e+00 -4.2284913063e+00 -4.5130626678e+01
1.4664224386e+00 -3.4754595757e+00 -4.5022266388e+01


I have made sure it is ASCII format and it the mesh works in Fluent.

Thanks,
Lauren
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