WARNING: Failed to find a mesh intersection on a tally mesh filter.

User Support
1

I have installed the new version of OpenMC (ver. 0.9.0).

I edit my XML files directly.

The following message appears after every few batches:

WARNING: Failed to find a mesh intersection on a tally mesh filter.

Can you please tell me what needs to be done in order to run computations without this warning?

I am including the XML files.

Thanks so much!

Sincerely,

Shawn Wachter

geometry.xml (3.79 KB)

materials.xml (4.44 KB)

plots.xml (1.92 KB)

settings.xml (1.67 KB)

tallies.xml (1.84 KB)

2

Hi Shawn,

The short answer is that this happens because of the nature of your mesh definition, in particular the extent in the y direction is very small relative to the overall size of the geometry. If you’re building the code from source, there’s a simple change you can make that will avoid the issue. In src/tally_filter.F90, there’s an integer parameter called MAX_SEARCH_ITER that is currently set to 100. Set this to some higher value (1000 seems to work for me) and the warning messages will go away.

Best regards,
Paul