[gaensebluemchen]

Hi foamers,
I want to make a 2D mesh with SHM. I can do this with extrudeMesh. the problem is, that first, a 3D mesh is generated which needs a lot of RAM and makes the whole process slow. So, I tried to define the refinement regions just at the patch, that I want to extrude. Eg. width of object = 0.1, but the refinement region would only go from 0 to 0.001. this saves a lot of cells and computation time.

the problem is, that my extrudeMeshDict seems so stop working with this approach.
If anyone could help me with that, I would be very glad.

[AtoHM]

What error are you getting?
I used this very approach recently and it worked like a charm.

[gaensebluemchen]

thank you very much for your reply and encouragement. there isn't really an error message but just the extrudeMeshDict isn't working anymore. the mesh doesn't collapse. It has worked as long as the refinementRegions went over the whole depth of the mesh.


Here is the output of extrudeMesh:



/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2306 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : _fbf00d6bf2-20230626 OPENFOAM=2306 version=v2306
Arch : "LSB;label=32;scalar=64"
Exec : extrudeMesh
Date : Mar 23 2024
Time : 18:15:18
Host : compile-infinix1
PID : 22396
I/O : uncollated
Case : /afs/physnet.uni-hamburg.de/users/AU/nnordblo/openfoam/Cases/FmM13_22_extruded/FmM13_22
nProcs : 1
trapFpe: Floating point exception trapping enabled (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 5, maxFileModificationPolls 20)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Selecting extrudeModel plane
Selected extrudeModel for linearNormal using coeffs
{
constructFrom patch;
sourceCase "$FOAM_CASE";
sourcePatches ( back );
exposedPatchName front;
extrudeModel plane;
thickness 0.1;
flipNormals false;
mergeFaces false;
}

Extruding from patch using model plane
Collapsing edges < 0.0001 of bounding box

Extruding patches 1(back) on mesh "/afs/physnet.uni-hamburg.de/users/AU/nnordblo/openfoam/Cases/FmM13_22_extruded/FmM13_22"

Create mesh for time = 0

Adding overall 0 processor patches.
Mesh bounding box : (-0.14 -0.064 -0.099) (0.257 0.14 0.001)
with span : (0.397 0.204 0.1)
Merge distance : 1e-05

Collapsing edges < 1e-05 ...

Uncollapsed edges = 0 / 3616338
Number of points : 1458540
Not visited : 0
Not collapsed : 1458540
Collapsed : 0

Collapsing 0 cells
Writing mesh to "/afs/physnet.uni-hamburg.de/users/AU/nnordblo/openfoam/Cases/FmM13_22_extruded/FmM13_22/constant/region0"

End