Help with error in MCNP6: "Geometry error: no intersection found"

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SUMMARY

The discussion centers on resolving the "Geometry error: no intersection found" issue encountered in MCNP6, specifically when running input files that lead to the loss of 10 particles. Users are advised to ensure they are not referencing outdated files and to verify that the correct input file is being executed. The conversation highlights the importance of checking for fatal errors in the output file and ensuring that tally cards, such as dose conversion (de df), correspond to existing tally numbers. Proper file management and input verification are crucial for successful execution.

PREREQUISITES
  • Familiarity with MCNP6 simulation software
  • Understanding of geometry setup in MCNP6
  • Knowledge of input file structure and syntax
  • Experience with interpreting output files from MCNP6
NEXT STEPS
  • Review MCNP6 documentation on geometry errors
  • Learn how to properly configure tally cards in MCNP6
  • Investigate common pitfalls in input file management for MCNP6
  • Explore troubleshooting techniques for particle loss in MCNP6 simulations
USEFUL FOR

This discussion is beneficial for nuclear engineers, radiation physicists, and researchers using MCNP6 for simulations, particularly those encountering geometry-related errors and input file management challenges.

ameermukhtar
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TL;DR
Geometry error: no intersection found.
run terminated because 10 particles got lost.
Geometry error: no intersection found.
run terminated because 10 particles got lost. please anyone can help me

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here is input
 

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Did you edit this after running it? I get a lot of errors, but not that one. If you can change the name of the output file to add .txt and attach that, that would help a lot.
 
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today i again run this file and edit but i am not successful here i am attached the file
 

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this is my input file
 

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I have to modify this due to library differences and other issues but I don't think that is affecting the errors I can see. You have dose conversion (de df) cards for a tally 5 that doesn't exist. My version of the program stops with fatal errors before transport is run. When I fix that error, the input file runs fine. I don't see any way you can get a "10 particles got lost" error with this input file.

Check you are not looking at old files. Reload the files. Make sure the program is running the input you are telling it to, and not defaulting to "inp", if that file exists rename it to something else. Make sure you don't have a second copy in another directory and running the wrong one. Read the output file, check the quoted input in the output file to see that it matches what you think is the input. Verify the fatal errors in the same output file. I have made all these mistakes myself, it's normal. Don't worry, don't be ashamed, they are part of the learning process. There will be an answer that explains this and if you do things step by step you should find it.
 
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Alex A said:
I have to modify this due to library differences and other issues but I don't think that is affecting the errors I can see. You have dose conversion (de df) cards for a tally 5 that doesn't exist. My version of the program stops with fatal errors before transport is run. When I fix that error, the input file runs fine. I don't see any way you can get a "10 particles got lost" error with this input file.

Check you are not looking at old files. Reload the files. Make sure the program is running the input you are telling it to, and not defaulting to "inp", if that file exists rename it to something else. Make sure you don't have a second copy in another directory and running the wrong one. Read the output file, check the quoted input in the output file to see that it matches what you think is the input. Verify the fatal errors in the same output file. I have made all these mistakes myself, it's normal. Don't worry, don't be ashamed, they are part of the learning process. There will be an answer that explains this and if you do things step by step you should find it.
sir where is input modify file
 
ameermukhtar said:
sir where is input modify file
sir i red the my input file now a time i don't need de5 and df5 but i need these factors 𝜙epithermal (n/cm2s) × 109 𝜙epithermal/𝜙thermal D˙f/𝜙epithermal (Gy cm2) × 10−13 D˙𝛾/𝜙epithermal (Gy cm2) × 10−13 and now here is my input file attached and last things that sir how to attach the tally of df5?
 

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