Date: 2026-09-05 Purpose: Four helical bulk conductors crossing a periodic plane.

What it shows

Four helical copper conductors lie in an air cylinder, one period long, with a translated periodic boundary condition. The current ramps to 1 A over 10 s at room temperature. This deck demonstrates periodic boundaries on bulk conductors and serves as the volume-edge regression case. The periodic entry names gmsh vertices; the section "Regenerating a mesh for a periodic deck" in ../README.md explains what the mesh has to carry.

Files

file	role
helix.geo	geometry; mesh it with gmsh
input.conf	deck
Allrun, Allclean	wrappers for the shared launcher

Run

gmsh -3 helix.geo -o helix.msh

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

Or ./Allrun, which does both steps.

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.