Material assignment (indicator) is changed along voxel resolution

[mwkim]

Dear OpenLB users and developers,

I have trouble with making a proper indicator.

The original problem is shown in the below figure.
Material 3 (defined using cylinder3D indicator) is not defined as wanted.
You can see figures by following the procedure: right click of small figure icon and click open in the new tab.

I could not find any problems in my code, so I changed the voxel resolution with just a small hope.
The original case is N = 20 which means 20 voxels in the radius of the large pipe.

I use N = 23. Then, Indicator for material 5 does not work properly, and material 3 still has the problem.

When I set N = 50, material 5 becomes fine (not shown in above figure), but material 3 is still not good as you can see.

I make cylinder3D indicator similar to “aorta3D” case. Define a circle with a fixed center position (x1, y1, z1), set normal and radius, and extend 2 voxels to generate cylinder shapes.

Could you suggest solution for these problems?
1: indicator for material 3
2: indicator changes along resolution of voxel.

Best regards,
MK

[mwkim]

I solve the problem.

1. Load the original mesh (mesh_1) using FreeCAD
2. Generate part (solid) from the original mesh (mesh_1)
3. Make mesh (mesh_2) using the generated part (solid)
4. Use mesh_2 instead of mesh_1

Then everything becomes fine.

I don’t know the exact reason. It seems the original mesh is not watertight, which is the only possible guess in my mind, while I cannot find any errors and suspicious parts.

[Author]

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