rustytorch

overset added-mass pin (P5-3): a no-slip cylinder on the moving patch oscillating in a closed box of still fluid, the force fitted over the last two periods — C_m = 1.069 (n = 32) / 1.097 (n = 64) against Stokes's 1.064 plus box blockage: the composit…

#588:Commit 33534ee688 pushed by osobh

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2026-09-11 05:08:30 +00:00

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prescribed-motion replay: per-step Schwarz rounds, convergence, background residual, patch divergence and mass defects in the CSV — so the next burst is seen forming

#585:Commit aeb70eb507 pushed by osobh

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2026-09-11 05:08:30 +00:00

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prescribed-motion replay: the fluid's power on the flag split face by face (normal vs tangential traction; root / middle / tip thirds) beside the nodal Σ F·ḋ, and replay instants (RTX_FSI2O_SAVE + SAVE_EVERY or SAVE_AT=t1,t2,… — the step that first…

#582:Commit 1562b7cbb5 pushed by osobh

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2026-09-10 23:08:30 +00:00

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P5-3 energy discriminator: prescribed motion on the overset fluid alone — fsi2_harness/replay.rs (a march's saved instants as cubic-Hermite kinematics with the saved velocities as slopes, the prescribed wall velocity the interpolant's exact derivative…

#579:Commit f61c427b6d pushed by osobh

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2026-09-10 23:08:30 +00:00

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FSI2 overset harness: RTX_FSI2O_DT_SCALE scales the CFL-derived fluid step — P5-3's dt-convergence probe of the first-order Euler fluid steps (the band's placement is excluded: 94.0 mm at a 60 mm patch vs 94.8 at 40 mm; the s = 8 pair moved the amplit…

#576:Commit 7e13d14e96 pushed by osobh

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2026-09-10 17:08:30 +00:00

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FSI2 overset march: print every coupling setting once (coupler, floor, rtol, stall accept, max subit, predictor, s, patch offset × rows) and add RTX_FSI2O_LOAD_SETTLE (rigid steps after a loaded state, clock put back; default 20) — P5-3 lost a day to …

#573:Commit 75ab6e77b4 pushed by osobh

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2026-09-09 23:08:30 +00:00

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P5-3 instruments: per-region wall loads on saved instants (top / bottom / tip arc / fillets+cylinder — drag, lift, normal-traction mean/min/max; RTX_FSI2O_AUDIT_FACES, RTX_FSI2O_AUDIT_ONLY) and the patch-thickness knobs (RTX_FSI2O_PATCH_OFFSET / _PATC…

#570:Commit 3e019d1491 pushed by osobh

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2026-09-09 17:08:30 +00:00

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P5 audit exact on the moving path: the composite rebuilt around a saved instant carries the march's dt (from the mesh the march started on — the warm base under RTX_FSI2O_WARM_SWEEPS — whatever patch the instant holds; 0.2 % of dt read as 0.3–5 N/m …

#567:Commit 2c1143076e pushed by osobh

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2026-09-08 23:08:30 +00:00

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rtx-cfd: the deformed cylinder–flag build's hull source carries the deformed outline — the cylinder + tip disc alone give the chord under a bent flag's convex side (P5-2 died at tip −35 mm with the patch 4.4 h thick where 6 h was asked, an acceptor'…

#564:Commit 06229dd9a2 pushed by osobh

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2026-09-08 23:08:30 +00:00

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P5 audit: the overset march saves the composite at every N-th committed step (RTX_FSI2O_SAVE_EVERY: background, the deformed patch's nodes, its vectors, d, ddot, time), and fsi2_overset_audit_of_saved_instants (RTX_FSI2O_AUDIT=dir) rebuilds the composi…

#561:Commit 3c2add3f32 pushed by osobh

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2026-09-08 17:08:31 +00:00

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rtx-cfd: cylinder_flag_patch_deformed_from — the warm-started regeneration (P5's cost lever): the previous patch's interior and its outer ring projected onto the new offset polygon as the start, and an IDEMPOTENT build (one Winslow sweep alternating w…

#558:Commit 3a68048934 pushed by osobh

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2026-09-08 17:08:31 +00:00

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P5-1: RTX_FSI2O_NEWMARK_GAMMA — Newmark dissipation on the flag (β = (γ + ½)²/4); at γ = 0.9 the s = 1 overset march holds 0.3 s from the cached state (789 steps, 1.8 passes, no death) with the physical onset, where γ = ½ ran away in 90 steps: the…

#555:Commit 62f1d4bf9b pushed by osobh

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2026-09-08 17:08:31 +00:00

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P5-1 instruments and discriminators: RTX_FSI2O_NO_WALL_VEL, _FREEZE_PATCH, _VOLUME_PRESERVE (the imposed wall velocity's net flux removed uniformly along the wall), the pass trace carries the fluid's power on the flag, the wall-pressure roughness, the …

#552:Commit 565215baf9 pushed by osobh

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2026-09-08 17:08:31 +00:00

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P5-1 instruments: the overset fluid saves/loads its rigid-phase state (RTX_FSI2O_SAVE / _LOAD — a coupling experiment then costs seconds, not the 12-minute rigid march), dumps the interface edges when the composite refuses a patch (RTX_FSI2O_DUMP_DIR,…

#549:Commit 2ed36c3a8c pushed by osobh

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2026-09-08 17:08:30 +00:00

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rtx-cfd: the deformed cylinder–flag outline's edge fractions come from the UNDEFORMED straight edge (x_tip_ref), so the patch topology is the mesh family's and not the deformation's — the P5-1 gate run died at the first bend with set_mesh refusing 14…

#546:Commit d74571e21a pushed by osobh

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2026-09-08 17:08:30 +00:00

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P5-1: FSI2 with the fluid on the overset — fsi2_harness/overset.rs (the background without a body, the cylinder–flag patch regenerated around the deformed flag every pass via set_patch_mesh, the wall velocity from the interface velocities along the w…

#543:Commit f0b2563bf8 pushed by osobh

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2026-09-08 17:08:30 +00:00

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rtx-cfd: P5-0 — cylinder_flag_patch_deformed / cylinder_flag_outline_deformed: the O-grid around the cylinder and the FEA's deformed flag edges (FlagEdges bottom / tip / top), edges resampled at the rigid outline's graded arclength spacing, root fille…

#540:Commit c2451fbacf pushed by osobh

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2026-09-08 17:08:30 +00:00

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rtx-cfd: overset_cfd23 RTX_OVERSET_CFD23_PHASE=N — the momentum chain's stages sampled every N steps and averaged over the window; over whole shedding periods the unsteady terms vanish and the averaged chain is exact (the patch balance's unstored unst…

#537:Commit cee9adef26 pushed by osobh

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2026-09-08 17:08:30 +00:00

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rtx-cfd: OversetPisoSolver::set_time; overset_cfd23 resumes a march from a saved field (RTX_OVERSET_CFD23_RESUME_T, _T_START) — CFD3 ny = 82's wake is still growing at t = 6–9 s (half-window amplitudes 187 / 339), the settled amplitude needs t = 15

#534:Commit 1a8f4aaebe pushed by osobh

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2026-09-08 11:08:30 +00:00

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rtx-cfd: overset_cfd23 RTX_OVERSET_CFD23_ND=explicit — the patch's across-diffusion explicit (dt limit then includes the n-spacing) for the 10 mm damping-floor probe; field tags carry it

#531:Commit ec17217e9e pushed by osobh

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2026-09-08 05:08:31 +00:00

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rtx-cfd: solver_metric_force carries the scheme's limited face correction with the predictor's far-upwind choice, so the flux form is the solver's under TVD too (CFD2 ny = 41: three boxes spread 1.8 N/m → 5e-13; the upwind-only form read 120.2 for a s…

#528:Commit 11d001fe48 pushed by osobh

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2026-09-08 05:08:30 +00:00

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rtx-cfd: overset_cfd23 — Turek–Hron CFD2/CFD3 on the overset (the harness's ramped inflow from rest, TVD background and patch, 3-round cap), loads by the patch wall stress with the solver-flux-form box and the CV formula beside it as window statistic…

#525:Commit ce3cbcce57 pushed by osobh

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2026-09-08 05:08:30 +00:00

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rtx-cfd: overset_cfd1 RTX_OVERSET_ROWS — the overlap depth (patch rows kept non-hole below the acceptor row, default 4) as a knob for the §5.11 band probe; saved-field tags carry it; rows ≤ 3 are refused by the map at ny = 41 (acceptor donors reach t…

#522:Commit 36af178980 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: overset momentum residual carries its pieces per ring face (time, convective, diffusive, pressure); overset_cfd1 offline probes on the saved fields — RTX_OVERSET_CFD1_FRONT dumps the cylinder-front faces by piece, RTX_OVERSET_CFD1_RAW re-eval…

#519:Commit 4c000266d9 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: CurvilinearPisoSolver::momentum_balance — the patch's own momentum balance on its solved cells in the scheme's fluxes (outward ρFu_f with the predictor's face value, Laplacian-form μ∇u·S on the solved/acceptor interface and the wall, the l…

#516:Commit 0215c7d6a5 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: OversetPisoSolver::solver_metric_force — the box force in the predictor's own flux form (upwind convective, diffusive, cell pressure on the momentum control volumes' faces, minus the unsteady term); box-independent to rounding in the active r…

#513:Commit e31576d543 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: OversetPisoSolver::momentum_residual — the background predictor's own staggered stencil (u_rhs/v_rhs, factored out of the predictor bit-identically) evaluated on every face of a NaN-masked field; solved faces read rounding, the active–fringe…

#510:Commit 6f9b0d43b2 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: overset_cfd1 prints five CV boxes (all outside the fringe ring), the wall pressure/viscous split and the fringe extents at the settled state

#507:Commit cbec40b999 pushed by osobh

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2026-09-07 23:08:30 +00:00

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rtx-cfd: OverlapMap::region_force — momentum flux into a background region (control-volume face formula, one-sided next to holes); overset_cfd1 prints the four momentum routes (CV box, ring outer, hole boundary, wall) and their defects at the settled …

#504:Commit 134ac03870 pushed by osobh

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2026-09-07 17:08:30 +00:00

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rtx-cfd: PatchConvection::TvdVanAlbada — van Albada deferred correction on the curvilinear predictor (downwind-side linear weight, gradient-ratio r over the face d lengths, far-upwind across the opposite face, boundary faces upwind); annulus MMS order…

#501:Commit 5f780447de pushed by osobh

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2026-09-07 11:08:30 +00:00

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