Add lunar regolith JKR adhesion angle of repose benchmark#58
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Add lunar regolith JKR adhesion angle of repose benchmark#58
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Column-collapse benchmark validating JKR adhesion in reduced gravity.
Particles settle in a narrow column, then walls are removed and the pile
collapses. The final pile profile depends on friction, JKR surface energy,
and gravity (Bond number scaling).
Includes:
- main.rs: Two-stage simulation (settling + collapse) with wall removal
- config.toml: Default config for lunar gravity with moderate adhesion
- run_benchmark.py: Parametric study over {Earth,Moon} x {0,5,20,50 mJ/m^2}
- validate.py: Checks angle trends vs adhesion and gravity
- plot.py: Publication plots of angle vs surface energy and Bond number
- README.md: Physics documentation and usage instructions
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The column collapse approach did not produce a meaningful angle of repose —
non-cohesive particles just spread flat and hit the box walls. This rewrite:
- Uses rate-based insertion (10 particles/500 steps) from a narrow slot
above center, forming a natural conical pile
- Uses shrink-wrap boundary in z to track pile height
- Measures angle by binning particles by |x|, finding surface heights,
and fitting a line (atan of |slope|)
- Simplifies main.rs (no stage transitions or wall removal needed)
- Keeps same parametric study: {Earth, Moon} × {0, 5, 20, 50 mJ/m²}
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
examples/bench_lunar_regolith/validating JKR adhesion under reduced gravityTest plan
cargo build --no-default-features --example bench_lunar_regolithcompilespython run_benchmark.pypython validate.py(angle increases with adhesion, steeper on Moon)🤖 Generated with Claude Code