Not sure how to mesh this
I am attempting to simulate flow around an instrument that is to be mounted under the wing of an aircraft. Instead of attempting to describe it, here is a screen shot from gambit:
The model I'm working with is extended back a little by projecting the rear [hidden] face in the +x direction to simulate the body of the probe past the shroud. This probe will be typically flying around 30k feet (200 mb) and 225 m/s, and I need to be able to simulate it with a compressible regime.
I've managed to mesh and model a test run, but It's not to my liking and I'm not sure exactly how to proceed.
Currently the bulk of the surface of the probe is meshed at a 1mm interval at the front working back to a 5mm interval on the less complicated portions of the shroud and body. This is as course as I could go while maintaining skewness under 0.5. The probe, from tip to back of the housing is approx 500 mm long and the tips are (outside edge-edge) 200 mm wide. I currently have a domain that is 1100x1000x1000 mm along the same axis layout as in the image. That puts 550 mm of clear air in front of the probe, about 350 in the +/- y direction and nearly 450 in the +/- Z.
I can successfully mesh this volume using T-grid, which produces reasonable results when run in noncompressible mode. However, the mesh interval in the critical region I want to study (between the tips and out in front) becomes very coarse, very quickly and I'm not sure I'm achieving the particle calculation accuracies I need.
Is there a way to essentially mesh an interior part of the volume on a constant mesh spacing, then grow that out through the rest of the volume? I tried dividing the volume into two parts...with a cylindar surrounding the probe, meshed at a small interval, then growing the mesh in the outer domain using a boundary layer and the cooper scheme, but that interface between the two volumes is causing weird things to happen.
you can mesh everything with gambit (even complex geometries).
The problem occures when you try getting full hexa-mesh
Regarding your issue, try with tet-hexcore and apply size-function
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