Date: 2026-09-05 Purpose: Two-layer CORC cable with a Python-generated mesh.

What it shows

This deck models two counter-wound layers of three tapes on a straight core, with solder between the layers. A twisted periodic condition represents one period of an infinite cable. A 200 A ramp over 10 s drives the model for 15 s with Newton, Anderson stabilization, MUMPS, and GMRES. The thermal sections are commented out.

python/main.py generates the mesh, writes corc.msh, and prints the matching topology section in corc_topology.conf. The comments at the top of main.py explain the pitch, the number of turns, and which parameter choices are currently meshable.

CORC(R) is a registered trademark of Advanced Conductor Technologies LLC, Boulder, CO, used with kind permission to identify the cable technology represented by this example (https://www.advancedconductor.com/).

Files

file	role
python/main.py	mesh generator; run it from this directory
python/corc/, python/mesh/	packages the generator uses
python/corc/tests/	unit tests for the generator
input.conf	deck

Run

This deck ships no .geo. The mesh is built by a Python tool, which also prints the matching topology section for input.conf:

python3 python/main.py # writes the .msh into the current directory

../../build/bin/belfem # or mpirun -np 4 ../../build/bin/belfem

Run it from this directory so the mesh lands where input.conf expects it. The tool needs numpy, scipy, sympy and matplotlib, and calls the gmsh executable.

Shared launcher

../scripts/Allrun generates the mesh, chooses ranks and threads, and can submit to Slurm; ../scripts/Allclean removes run output. To use them from this directory, copy the two wrapper scripts Allrun and Allclean from examples/helix/ here and run ./Allrun (./Allrun --dry-run prints the plan first). If you copy this deck out of the tree, copy examples/scripts/ along with it and point the wrappers at its new location. The launcher does not build plugins; do that step by hand as described above. Per-deck settings go in a run.conf next to input.conf; see ../scripts/README.md.