LTS: Simplify the selection of LTS operation

applications/solvers/lagrangian/coalChemistryFoam/setRDeltaT.H

@@ -73,7 +73,6 @@ License
     }
 
     // Reaction source time scale
-    if (alphaTemp < 1.0)
     {
         volScalarField::DimensionedInternalField rDeltaTT
         (

applications/solvers/multiphase/reactingTwoPhaseEulerFoam/phaseSystems/twoPhaseSystem/twoPhaseSystem.C

@@ -175,9 +175,7 @@ void Foam::twoPhaseSystem::solve()
     label nAlphaSubCycles(readLabel(alphaControls.lookup("nAlphaSubCycles")));
     label nAlphaCorr(readLabel(alphaControls.lookup("nAlphaCorr")));
 
-    bool LTS =
+    bool LTS = fv::localEulerDdt::enabled(mesh);
-        word(mesh.ddtScheme("default"))
-     == fv::localEulerDdtScheme<scalar>::typeName;
 
     word alphaScheme("div(phi," + alpha1.name() + ')');
     word alpharScheme("div(phir," + alpha1.name() + ')');

src/combustionModels/laminar/laminar.C

@@ -78,9 +78,7 @@ void Foam::combustionModels::laminar<Type>::correct()
     {
         if (integrateReactionRate_)
         {
-            word ddtScheme(this->mesh().ddtScheme("Yi"));
+            if (fv::localEulerDdt::enabled(this->mesh()))
-
-            if (ddtScheme == fv::localEulerDdtScheme<scalar>::typeName)
             {
                 const scalarField& rDeltaT =
                     fv::localEulerDdt::localRDeltaT(this->mesh());

src/finiteVolume/cfdTools/general/include/createRDeltaT.H

@@ -1,6 +1,4 @@
-bool LTS =
+bool LTS = fv::localEulerDdt::enabled(mesh);
-    word(mesh.ddtScheme("default"))
- == fv::localEulerDdtScheme<scalar>::typeName;
 
 tmp<volScalarField> trDeltaT;
 

src/finiteVolume/finiteVolume/ddtSchemes/localEulerDdtScheme/localEulerDdt.C

@@ -33,6 +33,14 @@ Foam::word Foam::fv::localEulerDdt::rSubDeltaTName("rSubDeltaTName");
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+bool Foam::fv::localEulerDdt::enabled(const fvMesh& mesh)
+{
+    return
+        word(mesh.ddtScheme("default"))
+     == fv::localEulerDdtScheme<scalar>::typeName;
+}
+
+
 const Foam::volScalarField& Foam::fv::localEulerDdt::localRDeltaT
 (
     const fvMesh& mesh

src/finiteVolume/finiteVolume/ddtSchemes/localEulerDdtScheme/localEulerDdtScheme.H

@@ -37,6 +37,7 @@ See Also
     Foam::fv::CoEulerDdtScheme
 
 SourceFiles
+    localEulerDdt.C
     localEulerDdtScheme.C
     localEulerDdtSchemes.C
 
@@ -71,13 +72,18 @@ public:
     //- Name of the reciprocal local sub-cycling time-step field
     static word rSubDeltaTName;
 
+
     // Constructors
 
         localEulerDdt()
         {}
 
+
     // Member Functions
 
+        //- Return true if LTS is enabled
+        static bool enabled(const fvMesh& mesh);
+
         //- Return the reciprocal of the local time-step
         //  looked-up from the objectRegistry
         static const volScalarField& localRDeltaT(const fvMesh& mesh);

src/finiteVolume/fvMatrices/solvers/MULES/CMULESTemplates.C

@@ -89,11 +89,7 @@ void Foam::MULES::correct
 {
     const fvMesh& mesh = psi.mesh();
 
-    bool LTS =
+    if (fv::localEulerDdt::enabled(mesh))
-        word(mesh.ddtScheme("default"))
-     == fv::localEulerDdtScheme<scalar>::typeName;
-
-    if (LTS)
     {
         const volScalarField& rDeltaT = fv::localEulerDdt::localRDeltaT(mesh);
 

src/finiteVolume/fvMatrices/solvers/MULES/MULESTemplates.C

@@ -111,11 +111,7 @@ void Foam::MULES::explicitSolve
 
     psi.correctBoundaryConditions();
 
-    bool LTS =
+    if (fv::localEulerDdt::enabled(mesh))
-        word(mesh.ddtScheme("default"))
-     == fv::localEulerDdtScheme<scalar>::typeName;
-
-    if (LTS)
     {
         const volScalarField& rDeltaT = fv::localEulerDdt::localRDeltaT(mesh);