From c46216e645cd583177593ddd0e2e35e8b7fdec96 Mon Sep 17 00:00:00 2001
From: Andrew Heather <>
Date: Fri, 10 Dec 2021 15:43:14 +0000
Subject: [PATCH] COMP: Added missed file

---
 .../incompressible/pimpleFoam/setRDeltaT.H    | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 applications/solvers/incompressible/pimpleFoam/setRDeltaT.H

diff --git a/applications/solvers/incompressible/pimpleFoam/setRDeltaT.H b/applications/solvers/incompressible/pimpleFoam/setRDeltaT.H
new file mode 100644
index 0000000000..962bfa8766
--- /dev/null
+++ b/applications/solvers/incompressible/pimpleFoam/setRDeltaT.H
@@ -0,0 +1,69 @@
+{
+    volScalarField& rDeltaT = trDeltaT.ref();
+
+    const dictionary& pimpleDict = pimple.dict();
+
+    scalar maxCo
+    (
+        pimpleDict.getOrDefault<scalar>("maxCo", 0.8)
+    );
+
+    scalar rDeltaTSmoothingCoeff
+    (
+        pimpleDict.getOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.02)
+    );
+
+    scalar rDeltaTDampingCoeff
+    (
+        pimpleDict.getOrDefault<scalar>("rDeltaTDampingCoeff", 1.0)
+    );
+
+    scalar maxDeltaT
+    (
+        pimpleDict.getOrDefault<scalar>("maxDeltaT", GREAT)
+    );
+
+    volScalarField rDeltaT0("rDeltaT0", rDeltaT);
+
+    // Set the reciprocal time-step from the local Courant number
+    rDeltaT.ref() = max
+    (
+        1/dimensionedScalar("maxDeltaT", dimTime, maxDeltaT),
+        fvc::surfaceSum(mag(phi))()()
+       /((2*maxCo)*mesh.V())
+    );
+
+    // Update the boundary values of the reciprocal time-step
+    rDeltaT.correctBoundaryConditions();
+
+    Info<< "Flow time scale min/max = "
+        << gMin(1/rDeltaT.primitiveField())
+        << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
+
+    if (rDeltaTSmoothingCoeff < 1.0)
+    {
+        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
+    }
+
+    Info<< "Smoothed flow time scale min/max = "
+        << gMin(1/rDeltaT.primitiveField())
+        << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
+
+    // Limit rate of change of time scale
+    // - reduce as much as required
+    // - only increase at a fraction of old time scale
+    if
+    (
+        rDeltaTDampingCoeff < 1.0
+     && runTime.timeIndex() > runTime.startTimeIndex() + 1
+    )
+    {
+        rDeltaT =
+            rDeltaT0
+           *max(rDeltaT/rDeltaT0, scalar(1) - rDeltaTDampingCoeff);
+
+        Info<< "Damped flow time scale min/max = "
+            << gMin(1/rDeltaT.primitiveField())
+            << ", " << gMax(1/rDeltaT.primitiveField()) << endl;
+    }
+}