rtx-fsi: the interface noise probe reads RTX_FSI2_MG_RB itself (its solver is built outside the march's knob site; the first red-black probe run was vacuous)

2026-09-15 23:53:57 -05:00
parent f9d38bee55
commit 364766a54a
1 changed files with 7 additions and 0 deletions
@@ -106,6 +106,13 @@ fn fsi2_interface_noise_floor() {
        solver.set_poisson_precision(rtx_cfd::solvers::incompressible::MgPrecision::F32);
        println!("  poisson V-cycle precision: F32 (M1 probe)");
    }
+    // PERF-2 regime gate (`RTX_FSI2_MG_RB=1`): the red-black smoother.
+    if env_or("RTX_FSI2_MG_RB", 0.0) != 0.0 {
+        solver.set_poisson_smoother(rtx_cfd::solvers::incompressible::MgSmoother::RedBlack);
+        println!(
+            "  multigrid smoother: RED-BLACK symmetric Gauss–Seidel (PERF-2 regime, RTX_FSI2_MG_RB)"
+        );
+    }
    let dt_fluid = harness.dt_fluid;

    // Rigid march to operating loads (the floor rides with the loads —