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 orders 2.10/1.69 at 0.24× upwind; cylinder-flag MMS orders 1.98/1.97 (1.06× upwind — diffusion-dominated, recorded); knobs RTX_OVERSET_CFD1_TVD, RTX_OVERSET_MAX_ROUNDS, RTX_CF_SCHEME

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01X2GmJXeQ2njUecEKiJZ1G2

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

@@ -701,7 +701,7 @@ async fn taylor_green_order_is_unchanged_under_mesh_motion() -> CfdResult<()> {
         .and_then(|v| v.parse::<usize>().ok());
     for convection in [PatchConvection::Upwind, PatchConvection::None] {
         let (band, error_factor): (std::ops::Range<f64>, f64) = match convection {
-            PatchConvection::Upwind => (0.7..1.6, 2.0),
+            PatchConvection::Upwind | PatchConvection::TvdVanAlbada => (0.7..1.6, 2.0),
             PatchConvection::None => (1.8..2.4, 3.0),
         };
         let mut fixed = Vec::new();