ENH: setTimeStep: adjust timestep for adjustableRunTime writeInterval. Fixes #268.

src/postProcessing/functionObjects/utilities/setTimeStep/setTimeStepFunctionObject.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2013-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -103,7 +103,16 @@ bool Foam::setTimeStepFunctionObject::adjustTimeStep()
         // Wanted timestep
         scalar newDeltaT = timeStepPtr_().value(time_.timeOutputValue());
 
-        const_cast<Time&>(time()).setDeltaT(newDeltaT, false);
+        static label index = -1;
+
+        if (time().timeIndex() != index)
+        {
+            // Store current time so we don't get infinite recursion (since
+            // setDeltaT calls adjustTimeStep() again)
+            index = time().timeIndex();
+            // Set time, allow deltaT to be adjusted for writeInterval purposes
+            const_cast<Time&>(time()).setDeltaT(newDeltaT, true);
+        }
 
         return true;
     }

src/postProcessing/functionObjects/utilities/setTimeStep/setTimeStepFunctionObject.H

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2013-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -34,6 +34,10 @@ Description
     functionObjects. Supports 'enabled' flag but none of the other options
     'timeStart', 'timeEnd', 'outputControl' etc.
 
+    Note that any 'writeControl adjustableRunTime' will still be in
+    operation and will limit the wanted time step to account for the
+    - write interval and - timestep adjustment speed (time step cannot
+    change too quickly).
 
     Example of function object specification to manipulate the time step:
     \verbatim