How to create geometry

User Support
1

Hello everyone,

I just installed OPENMC today. I am very new to this.(basically started today). I have successfully installed openmc. I want to create a simple geometry of a wall but I do not know what to do. I have read the installation guide I do not seems to understand. I have error trying to run even the examples. What should I do?I am using OpenMC 0.14.0. Thanks

“”
Reading model XML file ‘model.xml’ …
WARNING: Other XML file input(s) are present. These files may be ignored in
favor of the model.xml file.
ERROR: No cross_sections.xml file was specified in materials.xml or in the
OPENMC_CROSS_SECTIONS environment variable. OpenMC needs such a file to
identify where to find data libraries. Please consult the user’s guide
at https://docs.openmc.org/ for information on how to set up data
libraries.
“”

2

It looks like you need to add the path to your cross_sections.xml file. You can either use: openmc.config[“cross_sections”] = “path/to/cross_sections.xml”
or
Materials.cross_sections = “path/to/cross_sections.xml”

3

thank you for the response. this solves the problem.