[farzadmech]

Hello all
I am doing snappyHexMesh on a very small object (20 micron diameters on a cylindrical pattern), but I git wrong faces. Please see the figure 1,2,3,4 which I attach. I already have done cylindrical refinement around the object, but I still got bad faces. Is there any suggestion what can I do to mesh this object better?


Thanks,
Farzad

[farzadmech]

I came across these two threads which might be helpful. Basically they are saying use one block for upstream and another for downstream and

mergeMeshes "../run/blabla1" rotor "../run/blabla2" stator

to merge both blocks(first block with snappyHexMesh) together.

blockMesh - two blocks with different vertices

How to use mergeMeshes ?? Examples?

I am going to test this approach, but any suggestion is highly appreciated.

Thanks,
Farzad

[farzadmech]

It will be easier to rescale the whole problem by several orders(1e6) and then use the snappyHexMesh to mesh the whole thing and then rescale it back to the original scale using

transformPoints -scale '(0.000001 0.000001 0.000001)'

Also, since meshing process will be very time consuming, it is better to use snappyHexMesh in parallel;

How to run snappyHexMesh in parallel:

- decomposeMethod in decomposeParDict must be hierarchical or scotch !
- run "decomposePar"
- run "mpirun -np 8 -parallel snappyHexMesh -overwrite"
- afterwards run "reconstructParMesh -mergeTol 1e-06 -latestTime"

Thanks,
Farzad

Originally Posted by farzadmech

I came across these two threads which might be helpful. Basically they are saying use one block for upstream and another for downstream and

mergeMeshes "../run/blabla1" rotor "../run/blabla2" stator

to merge both blocks(first block with snappyHexMesh) together.

blockMesh - two blocks with different vertices

How to use mergeMeshes ?? Examples?

I am going to test this approach, but any suggestion is highly appreciated.

Thanks,
Farzad