MCNP6 Error: "Geometry error: no cell found"

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SUMMARY

The forum discussion addresses a geometry error encountered in MCNP6, specifically the "Geometry error: no cell found" issue. The solution involves adjusting the bounding sphere to ensure that no objects extend beyond its limits. Users are advised to utilize the command "mcnp ip inp=filename" to visualize the input and check for protrusions, particularly near the corners of defined regions. Increasing the size of the bounding sphere effectively resolves the problem.

PREREQUISITES
  • Familiarity with MCNP6 software
  • Understanding of geometry definitions in computational physics
  • Basic command line operations for running MCNP6 simulations
  • Knowledge of input file structure in MCNP6
NEXT STEPS
  • Learn how to define bounding geometries in MCNP6
  • Explore the use of the "mcnp ip" command for input visualization
  • Investigate common geometry errors in MCNP6 simulations
  • Study best practices for setting up simulation parameters in MCNP6
USEFUL FOR

Physics students, computational physicists, and researchers using MCNP6 for radiation transport simulations will benefit from this discussion.

ameermukhtar
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respected all
i am using MCNP6 and i am facing this problem from days and i can not found solution if anyone help me than i am ever grateful to you
files are attached
Thanks
 

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Hello @ameermukhtar,

Welcome to PhysicsForums. Your bounding sphere defines the experiment area, and anything outside it is part of the void. That works so long as no objects poke through. If you run "mcnp ip inp=filename", the default view seems fine. But click on the input box and type "pz 149", to check close to corners of 9 and 10, you can see the corners of 9 (rpp) sticking through it. Just try making the sphere bigger and see if that fixes the problem.
 
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can you correct it brother
 
Alex A said:
Hello @ameermukhtar,

Welcome to PhysicsForums. Your bounding sphere defines the experiment area, and anything outside it is part of the void. That works so long as no objects poke through. If you run "mcnp ip inp=filename", the default view seems fine. But click on the input box and type "pz 149", to check close to corners of 9 and 10, you can see the corners of 9 (rpp) sticking through it. Just try making the sphere bigger and see if that fixes the problem.
thank you dear the problem has been solved
 
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Likes   Reactions: berkeman

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