A strange geometry-related error visible only on 3D layer

Geometry and Materials
1

Dear Fluka users,

While creating a cyclotron target assembly, I encountered a geometry-related error that is only visible on the green 3D layer. There are actually two errors in different places of the assembly that are visible from different perspectives.

The first error is located somewhere in the rear part, with respect to the beam:

image
image1920×763 153 KB

The second appears in the middle:
image
image3427×1362 371 KB

The biggest problem is that I cannot see these errors in other layouts, so I cannot fix them. The assembly has axial symmetry along the z-axis, so theoretically, I should see the errors in the xz- and yz-projections as well. I tried to move the magenta viewport line along the z-axis to catch the errors on the xy-slice, but I didn’t find anything. So, I don’t understand where the errors come from or what causes them. I checked all the zones near the problematic areas in hopes of finding overlaps, but everything seems fine. Also, it seems that the .err files don’t contain errors, and the simulation runs without any problems.

How can I find and fix the errors?

Cheers,
Ihor

Input files

sim.flair (9.6 KB)
sim.inp (7.9 KB)

Versions

FLUKA: 4-5.1
Flair: 3.4-3

2

Dear Ihor,

I also don’t see any real errors with your geometry, and as I change the options for the 3D plotting (‘Quality’, ‘Antialias’, ‘Ambient Occlusion’) the error marks come and go.

I would just ignore them on the 3D view. If you prefer you can even turn them off by unticking the ‘Show Errors’ option in the layer settings.

Cheers,
David

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