P5-3 instruments: per-region wall loads on saved instants (top / bottom / tip arc / fillets+cylinder — drag, lift, normal-traction mean/min/max; RTX_FSI2O_AUDIT_FACES, RTX_FSI2O_AUDIT_ONLY) and the patch-thickness knobs (RTX_FSI2O_PATCH_OFFSET / _PATCH_ROWS, RTX_OVERSET_PATCH_OFFSET / _PATCH_ROWS; save tags carry the offset) — the overlap band sat at a fixed number of cells (6 h) and moved inward in metres with refinement

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_0116sg1Qz1gMv9hdcKP1XUam

crates/specialized/rtx-cfd/tests/overset_cfd23.rs

@@ -17,7 +17,12 @@
 //! asserted, until the ladder is seen; `RTX_OVERSET_CFD2_NY` /
 //! `RTX_OVERSET_CFD3_NY` (default 41), `RTX_OVERSET_CFD23_T_END` (smoke),
 //! `RTX_OVERSET_MAX_ROUNDS` (3), `RTX_OVERSET_ROWS` (4),
-//! `RTX_OVERSET_CFD1_SAVE` / `_LOAD` (fields, tagged by case).
+//! `RTX_OVERSET_CFD1_SAVE` / `_LOAD` (fields, tagged by case),
+//! `RTX_OVERSET_PATCH_OFFSET` (the patch's thickness in units of h,
+//! default 6 — so the overlap band sits at a fixed NUMBER of cells from
+//! the wall and moves inward in metres with refinement; P5-3 holds it in
+//! metres instead) and `RTX_OVERSET_PATCH_ROWS` (12; scale it with the
+//! offset to keep the wall spacing).
 
 use rtx_cfd::mesh::patch_gen::cylinder_flag_patch;
 use rtx_cfd::mesh::PatchSide;
@@ -80,10 +85,29 @@ fn overlap_rows() -> usize {
     )
 }
 
+/// The patch's thickness in units of h (`RTX_OVERSET_PATCH_OFFSET`, 6).
+fn patch_offset_h() -> f64 {
+    std::env::var("RTX_OVERSET_PATCH_OFFSET")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(6.0)
+}
+
+/// The patch's across-rows (`RTX_OVERSET_PATCH_ROWS`, 12).
+fn patch_rows() -> usize {
+    env_usize("RTX_OVERSET_PATCH_ROWS", 12)
+}
+
 fn field_tag(case: &str, ny: usize) -> String {
     let rows = overlap_rows();
+    let offset = patch_offset_h();
     format!(
-        "{case}_ny{ny}_tvd{}{}",
+        "{case}_ny{ny}_tvd{}{}{}",
+        if (offset - 6.0).abs() < 1e-12 {
+            String::new()
+        } else {
+            format!("_off{offset}")
+        },
         if rows == OversetParameters::default().overlap_rows {
             String::new()
         } else {
@@ -150,8 +174,8 @@ impl Composite {
             0.6,
             h,
             0.5 * 0.41 / 41.0,
-            6.0 * h,
-            12,
+            patch_offset_h() * h,
+            patch_rows(),
             4.0,
             500,
         )?;