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

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Discussion Overview

The discussion revolves around troubleshooting a geometry error encountered in the MCNP6 simulation software, specifically the message "Geometry error: no intersection found." Participants are seeking assistance in resolving this issue, which appears to be related to input file modifications and potential errors in the simulation setup.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant reports a geometry error leading to the loss of particles and requests help.
  • Another participant suggests checking the output file and ensuring the correct input file is being used, as they have not encountered the same error.
  • Concerns are raised about the presence of dose conversion cards for a tally that does not exist, which may contribute to the errors.
  • Participants discuss the importance of verifying that the correct input file is being executed and not a default or outdated version.
  • One participant expresses uncertainty about needing specific factors in their input file and asks how to attach a tally for df5.

Areas of Agreement / Disagreement

There is no consensus on the cause of the geometry error, as participants have differing experiences and suggestions for troubleshooting. Multiple competing views on the input file modifications and their effects remain unresolved.

Contextual Notes

Participants mention modifications due to library differences and the potential impact of these changes on the errors encountered. There are references to specific tally cards that may not exist in the user's version of the program, indicating a dependency on software versions and configurations.

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

屏幕截图 2025-01-01 003820.png
 

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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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