fsi2 harness: RTX_FSI2O_PATCH_CONVECTION knob (tvd default / upwind / none) on the overset patch, printed in the march's coupling header and the replay's PRESCRIBED header — P5-3's near-wake dispersion test on the ny 62 fixed-motion replay; harness files under the pinned toolchain's cargo fmt

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01LzcjQX7tvgn87CQCyg9Cfr

crates/specialized/rtx-fsi/tests/fsi2_harness/overset_march.rs

@@ -18,7 +18,7 @@ use rtx_fsi::{IqnIls, Subiterated};
 
 use super::march::MarchResult;
 use super::overset::OversetFluid;
-use super::{clamp_left, env_or, median, mid_amp, BenchmarkCase};
+use super::{BenchmarkCase, clamp_left, env_or, median, mid_amp};
 
 /// The overset march's knobs (`RTX_<PREFIX>_*`).
 #[derive(Debug, Clone)]
@@ -100,7 +100,7 @@ pub fn run_march_overset(case: BenchmarkCase, config: &OversetMarchConfig) -> Ov
     // Every setting the acceptance rule reads, printed once: P5-3 lost a
     // day to a floor of 2e-4 against the overnight marches' 1e-6.
     println!(
-        "  coupling: {} (reuse {}, ω0 {}, c1 {}), floor {:.1e}, rtol {:.1e}, stall accept {:.1e}, max subit {}, predictor {}, s = {}, patch offset {} h × {} rows",
+        "  coupling: {} (reuse {}, ω0 {}, c1 {}), floor {:.1e}, rtol {:.1e}, stall accept {:.1e}, max subit {}, predictor {}, s = {}, patch offset {} h × {} rows, patch convection {:?}",
         cfg.coupler,
         cfg.reuse,
         cfg.initial_relaxation,
@@ -113,6 +113,7 @@ pub fn run_march_overset(case: BenchmarkCase, config: &OversetMarchConfig) -> Ov
         cfg.subcycle,
         std::env::var("RTX_FSI2O_PATCH_OFFSET").unwrap_or_else(|_| "6".into()),
         std::env::var("RTX_FSI2O_PATCH_ROWS").unwrap_or_else(|_| "12".into()),
+        super::overset::patch_convection(),
     );
 
     // Phase 1: rigid flag to t_release (`RTX_FSI2O_LOAD=dir` replaces the
@@ -240,7 +241,11 @@ pub fn run_march_overset(case: BenchmarkCase, config: &OversetMarchConfig) -> Ov
     let mut worst_conservation = conservation0;
     println!(
         "  release: {faces0} wall faces transferred (conservation defect {conservation0:.2e}); initial tip acceleration |a| = {:.3e}",
-        (a_dofs.iter().map(|&k| flag_state.acceleration[k].powi(2)).sum::<f64>()).sqrt()
+        (a_dofs
+            .iter()
+            .map(|&k| flag_state.acceleration[k].powi(2))
+            .sum::<f64>())
+        .sqrt()
     );
 
     let fluid = RefCell::new(fluid);
@@ -452,7 +457,8 @@ pub fn run_march_overset(case: BenchmarkCase, config: &OversetMarchConfig) -> Ov
                 step + 1,
                 total_subiterations as f64 / (step + 1) as f64,
                 fl.rounds_total.get() as f64 / fl.correctors_total.get().max(1) as f64,
-                fl.reclassified_total.get() as f64 / (rigid_steps + (step + 1) * cfg.subcycle * 4).max(1) as f64,
+                fl.reclassified_total.get() as f64
+                    / (rigid_steps + (step + 1) * cfg.subcycle * 4).max(1) as f64,
                 fl.regen_seconds.get(),
                 t_fluid.get(),
                 phase_start.elapsed().as_secs_f64()