Discussion Overview
The discussion revolves around troubleshooting a "no tally, no plot" error encountered while using the TMESH tally in MCNP6 to analyze the flux from a 1 MeV point source through a spherical mesh. Participants are exploring the setup of the tally, visualization issues, and the extraction of tally data.
Discussion Character
- Technical explanation
- Debate/contested
- Mathematical reasoning
- Experimental/applied
Main Points Raised
- One participant describes their attempt to use the TMESH tally and expresses difficulty in understanding the MCNP6 manual.
- Another participant suggests specific corrections to the tally setup, including adjustments to the CORA, CORB, and CORC parameters.
- A participant inquires about the meaning of "cookie cutter," which is explained as a geometry error where regions must be uniquely defined.
- There are discussions about the use of visualization software (vised or xming) and the need to ensure the correct plotting commands are used.
- One participant asks how to obtain tally data from the TMESH in a format similar to traditional F4/F6 tallies, specifically for flux in mesh bins.
- Another participant mentions using "Gridconv" to convert data into a table form, but notes that the output lacks descriptors or labels.
- Participants share examples of output data from the mesh tally, discussing the challenges of interpreting the unformatted numbers.
Areas of Agreement / Disagreement
Participants express various suggestions and corrections, but there is no clear consensus on the solution to the "no tally, no plot" error or the best method for extracting and formatting tally data.
Contextual Notes
Participants note that the mesh tally files are not well documented, and understanding the output may require working in 1D rather than 3D. There are also mentions of potential geometry errors and the need for unique region definitions.
Who May Find This Useful
This discussion may be useful for individuals learning to use MCNP6, particularly those encountering issues with TMESH tallies and data extraction.