Errors, warnings, convergence problems, performance issues, unexpected results and questions related to the CalculiX solver during execution. Please post your issues here before creating an issue on the official GitHub repository.

Using CalculiX with external software and workflows: meshing tools, preprocessors/postprocessors (e.g. ParaView, FreeCAD, Gmsh), scripting, automation, HPC, co-simulation, and pipelines.

Questions from new users about installing/compiling on Linux, Windows & macOS, running, and understanding the basics of CalculiX, input files, and simple analyses.

Viewing, extracting, and interpreting results from CalculiX output files (.frd, .dat). Focus on understanding results and troubleshooting output data, not on configuring external tools.

Discussions for contributors and developers working on the CalculiX solver codebase, including feature requests.

Nonlinear analyses, contact, dynamics, thermal and coupled problems, user subroutines, and advanced element or material models.

Example models, step-by-step tutorials, reference cases, practical advice, workarounds, best practices and learning resources for CalculiX.

Official announcements regarding CalculiX releases, important notices, and forum updates. Only admins and moderators can post, but anyone can reply.

Defining geometry, meshes, materials, boundary conditions, loads, steps, and preparing input files for analysis.

Questions and discussions related to CalculiX GraphiX (cgx): geometry creation, meshing, scripting and visualization.