rtx-cfd: OversetPisoSolver::set_time; overset_cfd23 resumes a march from a saved field (RTX_OVERSET_CFD23_RESUME_T, _T_START) — CFD3 ny = 82's wake is still growing at t = 6–9 s (half-window amplitudes 187 / 339), the settled amplitude needs t = 15

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

@@ -416,7 +416,22 @@ async fn run_sampled(
         .ok()
         .and_then(|v| v.parse().ok())
         .unwrap_or(t_end);
-    let loaded = c.save_or_load(case)?;
+    let mut loaded = c.save_or_load(case)?;
+    // `RTX_OVERSET_CFD23_RESUME_T=t`: a loaded field is the state at `t` —
+    // set the clocks and march on to `t_end` (`_T_START` moves the window).
+    if let Some(t0) = std::env::var("RTX_OVERSET_CFD23_RESUME_T")
+        .ok()
+        .and_then(|v| v.parse::<f64>().ok())
+    {
+        assert!(loaded, "RESUME_T needs RTX_OVERSET_CFD1_LOAD");
+        c.solver.set_time(t0);
+        loaded = false;
+        println!("    resuming {case} ny = {ny} from t = {t0}");
+    }
+    let t_start = std::env::var("RTX_OVERSET_CFD23_T_START")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(t_start);
     let start = std::time::Instant::now();
     let mut s = Series {
         times: Vec::new(),