[sita]

Hi all,

I'm trying to create a mesh for a ship, with a symmetry plane along the ship's longitudinal axis (using snappyHexMesh, OpenFOAM-7, Scientific Linux 7.3). As the DTCHull tutorial does exactly this, I'm using this as a basis.

For a model scale hull I was able to create a mesh alright, but at full scale somehow both the interior and exterior of my ship are meshed, instead of just the exterior, as I intended. Only some thin parts on the outside of the ship geometry stay un-meshed

I've checked the STL-file that I use in MeshLab, and it seems perfectly watertight. Also, I've played around with the locationInsideMesh, but no matter where I put that, everything ends up being meshed.

Can anyone tell me how to fix this? Am I doing something wrong?

Many thanks!
Sita

[HPE]

Difficult to assess since you have already carried out the basic fixes.

Any further info that you can provide? e.g. dictionaries, settings etc.

[sita]

Hi HPE,

Thanks for getting back. I'm attaching some paraView screenshots of my blockMesh and STL-geometry, plus my dict-files for snappyHexMesh. Hopefully you can spot my mistake.

Many thanks,
Sita


P.S. In the attached version of snappyHexMeshDict, I set locationInsideMesh to a point inside the ship, to test whether in that case only the interior of the ship would be meshed (answer turned out to be no...)


P.P.S. At least my problem seems to be consistent: I just tried meshing the entire ship, instead of just one half, and also in this case I end up with practically everything being meshed

[sita]

Update: for now I've worked around this issue by meshing the model scale ship and then scaling the resulting mesh to full scale, using the transformPoints utility.

Still, I'd rather mesh the full scale geometry directly of course, so if anyone has any tips, I'd love to hear them!

Many thanks,
Sita