embedded3 S2-6: the oblique-wall instrument (tests/embedded3_wall_position_oblique.rs: z-flow / in-plane Poiseuille + Couette linear exactness; gate oblique_wall_position_is_second_order) and the closures it found, host + device, default OFF — the transverse centroid correction (RTX_E3_DIFFUSION_TRANSVERSE=1, wall_order bit 7), the fine distance floor (RTX_E3_DISTANCE_FLOOR=fine, bit 8); kernel geometry factored into cut_cv; DFG 2D-1 x-shift knob (RTX_E3_DFG_SHIFT_X); FLAG_X0 0.6 -> 0.25 in the three flag tests (the flag of every record was detached)

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

crates/specialized/rtx-cfd/src/solvers/incompressible/embedded3/wall.rs

@@ -101,6 +101,9 @@ pub struct Mask {
     pub(super) wall_order: u8,
     /// The oblique wall distance of the cut faces (S2-5).
     pub(super) wall_distance_oblique: bool,
+    /// The transverse centroid correction and the fine distance floor (S2-6).
+    pub(super) diffusion_transverse: bool,
+    pub(super) distance_floor_fine: bool,
     /// The axis-distance implicit wall exchange (S2-5).
     pub(super) wall_exchange_axis: bool,
     /// The centroid prototype's pressure-gradient weights per u / v / w face.
@@ -524,6 +527,8 @@ impl Mask {
             density: 1.0,
             wall_order: 1,
             wall_distance_oblique: false,
+            diffusion_transverse: false,
+            distance_floor_fine: false,
             wall_exchange_axis: false,
             grad_weights: None,
             diffusion_centroid: false,