R2-b: the added-mass pins print the confined target (potential flow 1.071 in the unit box + Stokes 0.064 = 1.135); R4 probe: RTX_FSI2O_STEP_CSV — every step's raw force with the accepted fluid step's overlap defects (the march CSV carries 10-step medians)

Co-Authored-By: Claude Fable 5.1 <[email protected]>

crates/specialized/rtx-cfd/tests/embedded3_added_mass.rs

@@ -167,7 +167,7 @@ fn cut_cell_added_mass() {
     let (cs, cc, c0) = fit(&op);
     let (cs_r, cc_r, _) = fit(&rec);
     println!(
-        "  ADDED MASS n = {n}: C_m operator {:.4} (reconstructed {:.4}) vs Stokes {:.3}; viscous {:.4} (reconstructed {:.4}) vs {:.3}; offset {:+.3e}; worst residual {worst:.1e}; {:.0} s",
+        "  ADDED MASS n = {n}: C_m operator {:.4} (reconstructed {:.4}) vs Stokes {:.3} unbounded / 1.135 confined (potential flow 1.071 in the unit box + 0.064); viscous {:.4} (reconstructed {:.4}) vs {:.3}; offset {:+.3e}; worst residual {worst:.1e}; {:.0} s",
         cs / scale,
         cs_r / scale,
         1.0 + stokes,

crates/specialized/rtx-cfd/tests/overset_added_mass.rs

@@ -109,7 +109,7 @@ async fn oscillating_cylinder_added_mass_on_the_moving_patch() -> CfdResult<()>
     let dt = period / steps_per_period as f64;
     let beta = R * R * OMEGA / NU;
     println!(
-        "  n = {n}, h = {h:.4}, patch inner edge {hp:.4}, dt = {dt:.3e} ({steps_per_period} per period), A/r = {:.3}, KC = {:.3}, β = {beta:.0}: Stokes C_m ≈ {:.3}",
+        "  n = {n}, h = {h:.4}, patch inner edge {hp:.4}, dt = {dt:.3e} ({steps_per_period} per period), A/r = {:.3}, KC = {:.3}, β = {beta:.0}: Stokes C_m ≈ {:.3} (unbounded; the unit box confines the cylinder: potential-flow C_m 1.071 + Stokes 0.064 = 1.135, R2-b 2026-09-21)",
         AMP / R,
         2.0 * PI * AMP / R,
         1.0 + 4.0 / (PI * beta).sqrt()