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[blockMesh] blockMesh being killed automatically

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Old   September 16, 2015, 13:52
Unhappy blockMesh being killed automatically
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Jess
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Hello. I have been trying to create a simulation of semi-submersible platform but as it has 62 blocks, I decided to start trying to simulate just the bottom part first, which has 24 blocks. The problem is that when I use the command blockMesh, my mesh starts being generated and right after the 24 blocks get created it shoes a message saying "killed" and it stops. I thought it was a problem with my computer, so I tried to run it in other two computers, the same problem occurred. Anyone knows what the problem can be?


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Old   August 11, 2016, 15:24
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Thomas Oliveira
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Insufficient memory may be the reason why blockMesh is being killed, as explained on this post.

I needed to generate a mesh for a rectangular cuboidal domain divided into smaller identical rectangular cuboids. For this specific type of mesh, I have written a C++ program that creates the same files that would be created by blockMesh.
It is available here in case it can be useful to other people.

Using this code, I was able to generate a 500x500x500 mesh that I couldn't generate using blockMesh on my computer with 64 GB RAM. It takes 70% more time than the OpenFOAM's blockMesh, but requires 40% less memory.

[EDIT: a new version is available on the same link. Now it takes 24% more time than the OpenFOAM's blockMesh, but requires at most 80 MB, independently of the mesh size.]

Best wishes,
Thomas
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Last edited by t.oliveira; August 12, 2016 at 13:17.
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Old   April 5, 2018, 21:06
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KAWA
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Dear Thomas, How I can get the file, it seems the link does not work for me, Thanks in advance
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Old   April 9, 2018, 05:31
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Thomas Oliveira
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Dear Kawa,

I am sorry for the broken link. I had renamed the file. It is called boxMesh.C and can be found here.

Best wishes,
Thomas
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Old   November 23, 2023, 08:53
Default How to create polymesh file from bolckMeshdict outside openFoam?
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Debabrata Adhikari
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Hi,
Is there any other way to create polyMesh file outside openFOAM from the bolckMeshDict information? The bolckMeshDict has multiple blocks, not a single regular cubic domain. Does anyone have any comment on this? I want to make it outside openFOAM because my machine can not handle the large meshes.

Thank you,
Debabrata
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Old   November 23, 2023, 09:27
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Yann
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Hello,

There are several utilities in OpenFOAM to import mesh from other software (gmsh, Salome, ANSYS, ...)
http://www.wolfdynamics.com/wiki/mesh_conversion.pdf

But if your problem is your machine not being able handle such a large mesh, I doubt this will solve your problem. You will still end up with a mesh too large for your machine to handle, unless you change your meshing strategy.

Regards,
Yann
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