rtx-cfd + rtx-fsi: ECSW campaign phase 1 — snapshot dump + FlowField save/load

FlowField::save/load serialize the complete field state bit-exact (all twelve matrices including *_old, predictors and sources, so a load is a true restart state), with a roundtrip test asserting to_bits equality on every value and rejection of truncated/corrupt files. The march gains an ECSW snapshot knob (RTX_FSI{2,3}_SNAP path, SNAPEVERY, default off): every N committed steps it appends an FSNP record — t, full-DOF displacement/velocity/acceleration (what rtx_fea::mor's pod_basis/train_ecsw consume, plus what the phase-4 dynamic reduction will need) and the committed sparse nodal load for the offline full-vs-reduced replay. Reporting-only: reads committed state after acceptance, no float ops on the solver path. Verified: smoke run's FSNP parsed by an independent reader (570 DOFs, correct record count, physical values); FSI2 committed default digit-identical with the knob off. Co-Authored-By: Claude Fable 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01X2GmJXeQ2njUecEKiJZ1G2
2026-08-28 21:56:37 -05:00
parent 366a46b471
commit 9fe9d7f74a
4 changed files with 240 additions and 1 deletions
@@ -124,6 +124,8 @@ fn fsi3_added_mass_flag() {
            reuse: 2,
            smooth_in_h: 0.0,
            csv_path: None,
+            snap_path: None,
+            snap_every: 10,
            // The blind first relaxation must not explode the structure
            // on a map whose per-pass gain is in the hundreds; 0.05 keeps
            // the exploratory pass bounded (the secant takes over from