[Commercial meshers] fluent mesh to foam

LM4112 · May 24, 2013, 20:47

Dear all
I am trying to convert a fluent mesh to foam but I get the following error:

FINISHED LEXING

dimension of grid: 3
Creating shapes for 3-D cells
Building patch-less mesh...Killed

I've managed to convert the mesh of the same model but after increasing the number of elements (from 100,000 to 15 millions) I get this problem. Thanks in advance

Luca

wyldckat · May 25, 2013, 08:35

Greetings Luca,

Quote:

Originally Posted by LM4112

I've managed to convert the mesh of the same model but after increasing the number of elements (from 100,000 to 15 millions) I get this problem.

15 million? OK, a few questions:

How much RAM does your machine have?
Which architecture are you using? More specifically, if you're using 32 or 64bit. You can check by running:
Code:
```
uname -m
```
i686 means 32 bit, x86_64 means 64 bit.
Which mesh conversion utility are you using? fluentMeshToFoam or fluent3DMeshToFoam?

Best regards,
Bruno

LM4112 · May 25, 2013, 10:40

Dear Bruno

The system has 8 GB of RAM and is 64bit. The utility that I used is fluentMeshToFoam

best regards,
Luca

wyldckat · May 25, 2013, 11:29

Hi Luca,

OK, then it's not a problem of using 32bit only.

I forgot to also ask in the previous post:

Was the mesh generated in Fluent on the same machine? If not, how much RAM does the other machine have?
15 million... is it in cells or points?
And is the mesh mostly hexahedral or tetrahedral or polyhedral?

I ask this because I suspect that 8GB is not enough for converting this mesh, given that the mesh is converted and built on memory, not simply converted from one file to the other

.

For example (if my memory hasn't fail me), a simple test with blockMesh, for creating a simple cube shaped domain, using an hexahedral mesh with 8 million cells, it needed around 8GB of RAM. And this was just for the mesh... it didn't even have the fields!
If the mesh were tetrahedral, perhaps it could go up to 16 million cells, but I'm not sure.

Best regards,
Bruno

LM4112 · May 25, 2013, 11:35

The mesh was generated on the same machine and it counts 15 million of cells (full hexa). Then I guess I don't have enought RAM. I will try to d the conversion with the cluster that I will use for the simulations. Thanks a lot for the help

best regards,
Luca

May 24, 2013, 20:47	fluent mesh to foam	#1
LM4112 Member Luca Join Date: Mar 2013 Posts: 59 Rep Power: 13	Dear all I am trying to convert a fluent mesh to foam but I get the following error: FINISHED LEXING dimension of grid: 3 Creating shapes for 3-D cells Building patch-less mesh...Killed I've managed to convert the mesh of the same model but after increasing the number of elements (from 100,000 to 15 millions) I get this problem. Thanks in advance Luca

May 25, 2013, 11:29		#4
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,982 Blog Entries: 45 Rep Power: 128	Hi Luca, OK, then it's not a problem of using 32bit only. I forgot to also ask in the previous post: Was the mesh generated in Fluent on the same machine? If not, how much RAM does the other machine have? 15 million... is it in cells or points? And is the mesh mostly hexahedral or tetrahedral or polyhedral? I ask this because I suspect that 8GB is not enough for converting this mesh, given that the mesh is converted and built on memory, not simply converted from one file to the other . For example (if my memory hasn't fail me), a simple test with blockMesh, for creating a simple cube shaped domain, using an hexahedral mesh with 8 million cells, it needed around 8GB of RAM. And this was just for the mesh... it didn't even have the fields! If the mesh were tetrahedral, perhaps it could go up to 16 million cells, but I'm not sure. Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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May 25, 2013, 10:40		#3
LM4112 Member Luca Join Date: Mar 2013 Posts: 59 Rep Power: 13	Dear Bruno The system has 8 GB of RAM and is 64bit. The utility that I used is fluentMeshToFoam best regards, Luca

May 25, 2013, 11:35		#5
LM4112 Member Luca Join Date: Mar 2013 Posts: 59 Rep Power: 13	The mesh was generated on the same machine and it counts 15 million of cells (full hexa). Then I guess I don't have enought RAM. I will try to d the conversion with the cluster that I will use for the simulations. Thanks a lot for the help best regards, Luca