ENH: Updated surface film models to use cachedRandom

src/surfaceFilmModels/submodels/kinematic/injectionModel/cloudInjection/cloudInjection.C

@@ -28,7 +28,6 @@ License
 #include "fvMesh.H"
 #include "Time.H"
 #include "mathematicalConstants.H"
-#include "Random.H"
 #include "volFields.H"
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
@@ -53,7 +52,7 @@ Foam::surfaceFilmModels::cloudInjection::cloudInjection
 :
     injectionModel(type(), owner, dict),
     particlesPerParcel_(readScalar(coeffs_.lookup("particlesPerParcel"))),
-    rndGen_(label(0)),
+    rndGen_(label(0), -1),
     parcelPDF_(pdfs::pdf::New(coeffs_.subDict("parcelPDF"), rndGen_)),
     diameter_(owner.film().nCells(), 0.0)
 {

src/surfaceFilmModels/submodels/kinematic/injectionModel/cloudInjection/cloudInjection.H

@@ -37,6 +37,7 @@ SourceFiles
 
 #include "injectionModel.H"
 #include "pdf.H"
+#include "cachedRandom.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -72,7 +73,7 @@ protected:
         scalar particlesPerParcel_;
 
         //- Random number generator
-        Random rndGen_;
+        cachedRandom rndGen_;
 
         //- Parcel size PDF model
         const autoPtr<pdfs::pdf> parcelPDF_;