Omar SobhandClaude Fable 5
b321a9aba7
Performance Benchmarks / Run Benchmarks (push) Canceled after 0s
CI / Format Check (push) Canceled after 0s
CI / Clippy Check (push) Canceled after 0s
CI / Build (macos-latest) (push) Canceled after 0s
CI / Build (ubuntu-latest) (push) Canceled after 0s
CI / Test (macos-latest) (push) Canceled after 0s
CI / Test (ubuntu-latest) (push) Canceled after 0s
CI / Build CPU-Only (Explicit) (push) Canceled after 0s
CI / Python Bindings (maturin) (macos-latest) (push) Canceled after 0s
CI / Python Bindings (maturin) (ubuntu-latest) (push) Canceled after 0s
CI / WASM Build + Size Check (push) Canceled after 0s
CI / Distributed Training Tests (push) Canceled after 0s
CI / CI Success (push) Canceled after 0s
Documentation / Build API Documentation (push) Canceled after 0s
Documentation / Build User Guide (push) Canceled after 0s
With k = pi the decaying Taylor-Green vortex has zero normal velocity on the unit box for all time, so it fits the closed staggered domain exactly, with ZERO body force: convection is balanced identically by the true TG pressure and the decay comes from viscosity alone. This exercises exactly what the steady MMS harness cannot see — the time derivative, the unsteady pressure coupling and the projection's splitting error. The time-decaying tangential wall velocity enters by re-setting the wall hook each step. Measured (16/32/64, dt ~ h^2): L2 velocity 2.267e-2, 1.153e-2, 5.841e-3 — orders 0.97 and 0.98, first-order upwind's rate — and the kinetic-energy deficit against the exact e^(-4 nu pi^2 T) halves per refinement (0.0690, 0.0360, 0.0185; ratios 1.92, 1.95), within 2.3% on the finest mesh. Every step divergence-free to ~1e-7. Its first run caught two defects in the projection's inner solver: - The inner Gauss-Seidel stop summed the per-sweep iterate CHANGE — the same movement-not-residual pseudo-criterion the SIMPLE census flagged: slow modes move little per sweep while their residual is still large. - Plain GS contracts smooth modes by only 1 - O(h^2) per sweep, so the 400-sweep cap left max |div u| ~ 1e-2, GROWING with mesh size (8e-3 at 16^2 to 2e-2 at 64^2). The inner stop now measures the true equation residual, the sweep is SOR at the optimal Poisson factor omega = 2/(1 + sin(pi h)), and it converges relative to each projection's own source with a floor tied to the outer mass tolerance — so a long steady march no longer burns a hundred sweeps per step polishing negligible corrections. The steady MMS harness had masked all of this: a march to steady state iterates the projection to death regardless, which is why its divergence read 1e-9 while a 205-step transient left 1e-2. mms_piso's steady-state criterion is 1e-6 (was 1e-7): per-step projection noise at the mass tolerance floors |du/dt| just below 1e-6, and the L2 errors under measurement are 1e-2 to 1e-3. Its results are unchanged to six figures and still match SIMPLE's. 288 rtx-cfd tests, 0 failing. Co-Authored-By: Claude Fable 5 <[email protected]>