diff --git a/applications/solvers/combustion/reactingFoam/LTSReactingFoam/setRDeltaT.H b/applications/solvers/combustion/reactingFoam/LTSReactingFoam/setRDeltaT.H
new file mode 100644
index 000000000..6e771864a
--- /dev/null
+++ b/applications/solvers/combustion/reactingFoam/LTSReactingFoam/setRDeltaT.H
@@ -0,0 +1,123 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2013-2015 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+{
+    const dictionary& pimpleDict = pimple.dict();
+
+    // Maximum flow Courant number
+    scalar maxCo(readScalar(pimpleDict.lookup("maxCo")));
+
+    // Maximum time scale
+    scalar maxDeltaT(pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT));
+
+    // Smoothing parameter (0-1) when smoothing iterations > 0
+    scalar rDeltaTSmoothingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
+    );
+
+    // Damping coefficient (1-0)
+    scalar rDeltaTDampingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 1)
+    );
+
+    // Maximum change in cell temperature per iteration
+    // (relative to previous value)
+    scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05));
+
+
+    Info<< "Time scales min/max:" << endl;
+
+    // Cache old reciprocal time scale field
+    volScalarField rDeltaT0("rDeltaT0", rDeltaT);
+
+    // Flow time scale
+    {
+        rDeltaT.dimensionedInternalField() =
+        (
+            fvc::surfaceSum(mag(phi))().dimensionedInternalField()
+           /((2*maxCo)*mesh.V()*rho.dimensionedInternalField())
+        );
+
+        // Limit the largest time scale
+        rDeltaT.max(1/maxDeltaT);
+
+        Info<< "    Flow        = "
+            << gMin(1/rDeltaT.internalField()) << ", "
+            << gMax(1/rDeltaT.internalField()) << endl;
+    }
+
+    // Reaction source time scale
+    if (alphaTemp < 1.0)
+    {
+        volScalarField::DimensionedInternalField rDeltaTT
+        (
+            mag(reaction->Sh())/(alphaTemp*rho*thermo.Cp()*T)
+        );
+
+        Info<< "    Temperature = "
+            << gMin(1/(rDeltaTT.field() + VSMALL)) << ", "
+            << gMax(1/(rDeltaTT.field() + VSMALL)) << endl;
+
+        rDeltaT.dimensionedInternalField() = max
+        (
+            rDeltaT.dimensionedInternalField(),
+            rDeltaTT
+        );
+    }
+
+    // Update tho boundary values of the reciprocal time-step
+    rDeltaT.correctBoundaryConditions();
+
+    // Spatially smooth the time scale field
+    if (rDeltaTSmoothingCoeff < 1.0)
+    {
+        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
+    }
+
+    // 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 = max
+        (
+            rDeltaT,
+            (scalar(1.0) - rDeltaTDampingCoeff)*rDeltaT0
+        );
+    }
+
+    Info<< "    Overall     = "
+        << gMin(1/rDeltaT.internalField())
+        << ", " << gMax(1/rDeltaT.internalField()) << endl;
+}
+
+
+// ************************************************************************* //
diff --git a/applications/solvers/compressible/rhoPimpleFoam/rhoLTSPimpleFoam/setRDeltaT.H b/applications/solvers/compressible/rhoPimpleFoam/rhoLTSPimpleFoam/setRDeltaT.H
new file mode 100644
index 000000000..d56283d13
--- /dev/null
+++ b/applications/solvers/compressible/rhoPimpleFoam/rhoLTSPimpleFoam/setRDeltaT.H
@@ -0,0 +1,83 @@
+{
+    const dictionary& pimpleDict = pimple.dict();
+
+    scalar maxCo
+    (
+        pimpleDict.lookupOrDefault<scalar>("maxCo", 0.8)
+    );
+
+    scalar rDeltaTSmoothingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.02)
+    );
+
+    scalar rDeltaTDampingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 1.0)
+    );
+
+    scalar maxDeltaT
+    (
+        pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT)
+    );
+
+    volScalarField rDeltaT0("rDeltaT0", rDeltaT);
+
+    // Set the reciprocal time-step from the local Courant number
+    rDeltaT.dimensionedInternalField() = max
+    (
+        1/dimensionedScalar("maxDeltaT", dimTime, maxDeltaT),
+        fvc::surfaceSum(mag(phi))().dimensionedInternalField()
+       /((2*maxCo)*mesh.V()*rho.dimensionedInternalField())
+    );
+
+    if (pimple.transonic())
+    {
+        surfaceScalarField phid
+        (
+            "phid",
+            fvc::interpolate(psi)*(fvc::interpolate(U) & mesh.Sf())
+        );
+
+        rDeltaT.dimensionedInternalField() = max
+        (
+            rDeltaT.dimensionedInternalField(),
+            fvc::surfaceSum(mag(phid))().dimensionedInternalField()
+            /((2*maxCo)*mesh.V()*psi.dimensionedInternalField())
+        );
+    }
+
+    // Update tho boundary values of the reciprocal time-step
+    rDeltaT.correctBoundaryConditions();
+
+    Info<< "Flow time scale min/max = "
+        << gMin(1/rDeltaT.internalField())
+        << ", " << gMax(1/rDeltaT.internalField()) << endl;
+
+    if (rDeltaTSmoothingCoeff < 1.0)
+    {
+        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
+    }
+
+    Info<< "Smoothed flow time scale min/max = "
+        << gMin(1/rDeltaT.internalField())
+        << ", " << gMax(1/rDeltaT.internalField()) << 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.internalField())
+            << ", " << gMax(1/rDeltaT.internalField()) << endl;
+    }
+}
diff --git a/applications/solvers/lagrangian/coalChemistryFoam/LTSCoalChemistryFoam/setRDeltaT.H b/applications/solvers/lagrangian/coalChemistryFoam/LTSCoalChemistryFoam/setRDeltaT.H
new file mode 100644
index 000000000..e9697c790
--- /dev/null
+++ b/applications/solvers/lagrangian/coalChemistryFoam/LTSCoalChemistryFoam/setRDeltaT.H
@@ -0,0 +1,134 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+{
+    const dictionary& pimpleDict = pimple.dict();
+
+    // Maximum flow Courant number
+    scalar maxCo(readScalar(pimpleDict.lookup("maxCo")));
+
+    // Maximum time scale
+    scalar maxDeltaT(pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT));
+
+    // Smoothing parameter (0-1) when smoothing iterations > 0
+    scalar rDeltaTSmoothingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
+    );
+
+    // Damping coefficient (1-0)
+    scalar rDeltaTDampingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 0.2)
+    );
+
+    // Maximum change in cell temperature per iteration
+    // (relative to previous value)
+    scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05));
+
+
+    Info<< "Time scales min/max:" << endl;
+
+    // Cache old reciprocal time scale field
+    volScalarField rDeltaT0("rDeltaT0", rDeltaT);
+
+    // Flow time scale
+    {
+        rDeltaT.dimensionedInternalField() =
+        (
+            fvc::surfaceSum(mag(phi))().dimensionedInternalField()
+           /((2*maxCo)*mesh.V()*rho.dimensionedInternalField())
+        );
+
+        // Limit the largest time scale
+        rDeltaT.max(1/maxDeltaT);
+
+        Info<< "    Flow        = "
+            << gMin(1/rDeltaT.internalField()) << ", "
+            << gMax(1/rDeltaT.internalField()) << endl;
+    }
+
+    // Reaction source time scale
+    if (alphaTemp < 1.0)
+    {
+        volScalarField::DimensionedInternalField rDeltaTT
+        (
+            mag
+            (
+               (coalParcels.hsTrans() + limestoneParcels.hsTrans())
+              /(mesh.V()*runTime.deltaT())
+             + combustion->Sh()()
+            )
+           /(
+               alphaTemp
+              *rho.dimensionedInternalField()
+              *thermo.Cp()().dimensionedInternalField()
+              *T.dimensionedInternalField()
+           )
+        );
+
+        Info<< "    Temperature = "
+            << gMin(1/(rDeltaTT.field() + VSMALL)) << ", "
+            << gMax(1/(rDeltaTT.field() + VSMALL)) << endl;
+
+        rDeltaT.dimensionedInternalField() = max
+        (
+            rDeltaT.dimensionedInternalField(),
+            rDeltaTT
+        );
+    }
+
+    // Update tho boundary values of the reciprocal time-step
+    rDeltaT.correctBoundaryConditions();
+
+    // Spatially smooth the time scale field
+    if (rDeltaTSmoothingCoeff < 1.0)
+    {
+        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
+    }
+
+    // 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 = max
+        (
+            rDeltaT,
+            (scalar(1.0) - rDeltaTDampingCoeff)*rDeltaT0
+        );
+    }
+
+    Info<< "    Overall     = "
+        << gMin(1/rDeltaT.internalField())
+        << ", " << gMax(1/rDeltaT.internalField()) << endl;
+}
+
+
+// ************************************************************************* //
diff --git a/applications/solvers/lagrangian/reactingParcelFoam/LTSReactingParcelFoam/setRDeltaT.H b/applications/solvers/lagrangian/reactingParcelFoam/LTSReactingParcelFoam/setRDeltaT.H
new file mode 100644
index 000000000..caa9b4167
--- /dev/null
+++ b/applications/solvers/lagrangian/reactingParcelFoam/LTSReactingParcelFoam/setRDeltaT.H
@@ -0,0 +1,132 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+{
+    const dictionary& pimpleDict = pimple.dict();
+
+    // Maximum flow Courant number
+    scalar maxCo(readScalar(pimpleDict.lookup("maxCo")));
+
+    // Maximum time scale
+    scalar maxDeltaT(pimpleDict.lookupOrDefault<scalar>("maxDeltaT", GREAT));
+
+    // Smoothing parameter (0-1) when smoothing iterations > 0
+    scalar rDeltaTSmoothingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTSmoothingCoeff", 0.1)
+    );
+
+    // Damping coefficient (1-0)
+    scalar rDeltaTDampingCoeff
+    (
+        pimpleDict.lookupOrDefault<scalar>("rDeltaTDampingCoeff", 0.2)
+    );
+
+    // Maximum change in cell temperature per iteration
+    // (relative to previous value)
+    scalar alphaTemp(pimpleDict.lookupOrDefault("alphaTemp", 0.05));
+
+
+    Info<< "Time scales min/max:" << endl;
+
+    // Cache old reciprocal time scale field
+    volScalarField rDeltaT0("rDeltaT0", rDeltaT);
+
+    // Flow time scale
+    {
+        rDeltaT.dimensionedInternalField() =
+        (
+            fvc::surfaceSum(mag(phi))().dimensionedInternalField()
+           /((2*maxCo)*mesh.V()*rho.dimensionedInternalField())
+        );
+
+        // Limit the largest time scale
+        rDeltaT.max(1/maxDeltaT);
+
+        Info<< "    Flow        = "
+            << gMin(1/rDeltaT.internalField()) << ", "
+            << gMax(1/rDeltaT.internalField()) << endl;
+    }
+
+    // Reaction source time scale
+    {
+        volScalarField::DimensionedInternalField rDeltaTT
+        (
+            mag
+            (
+               parcels.hsTrans()/(mesh.V()*runTime.deltaT())
+             + combustion->Sh()()
+            )
+           /(
+               alphaTemp
+              *rho.dimensionedInternalField()
+              *thermo.Cp()().dimensionedInternalField()
+              *T.dimensionedInternalField()
+           )
+        );
+
+        Info<< "    Temperature = "
+            << gMin(1/(rDeltaTT.field() + VSMALL)) << ", "
+            << gMax(1/(rDeltaTT.field() + VSMALL)) << endl;
+
+        rDeltaT.dimensionedInternalField() = max
+        (
+            rDeltaT.dimensionedInternalField(),
+            rDeltaTT
+        );
+    }
+
+    // Update tho boundary values of the reciprocal time-step
+    rDeltaT.correctBoundaryConditions();
+
+    // Spatially smooth the time scale field
+    if (rDeltaTSmoothingCoeff < 1.0)
+    {
+        fvc::smooth(rDeltaT, rDeltaTSmoothingCoeff);
+    }
+
+    // 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 = max
+        (
+            rDeltaT,
+            (scalar(1.0) - rDeltaTDampingCoeff)*rDeltaT0
+        );
+    }
+
+    Info<< "    Overall     = "
+        << gMin(1/rDeltaT.internalField())
+        << ", " << gMax(1/rDeltaT.internalField()) << endl;
+}
+
+
+// ************************************************************************* //