fvModels: surfaceFilms: Support for multiple films

The surfaceFilm fvModel has been renamed surfaceFilms, and can now have
a number of independent film models specified.

For example, the hotBoxes tutorial could be modified to have separate
film regions for the boxes and for the floor. In which case, the names
of the separate films would need specifying as shown below.

    surfaceFilms
    {
        type    surfaceFilms;
        surfaceFilms (boxesFilm floorFilm); // <-- new entry
        libs    ("libsurfaceFilmModels.so");
    }

The old fvModel name, surfaceFilm, has been maintained for backwards
compatibility.

The Lagrangian surface film model now also requires the coupled
surfaceFilms to be specified when there is not just a single
default-named film. For example, in constant/cloudProperties:

    subModels
    {
        surfaceFilmModel thermoSurfaceFilm;

        thermoSurfaceFilmCoeffs
        {
            surfaceFilms    (boxesFilm floorFilm); // <-- new entry
            interactionType splashBai;
            deltaWet        0.0005;
            Adry            2630;
            Awet            1320;
            Cf              0.6;
        }

        ...
    }

tutorials/modules/multicomponentFluid/cylinder/constant/fvModels

@@ -20,9 +20,9 @@ clouds
     libs    ("liblagrangianParcel.so");
 }
 
-surfaceFilm
+surfaceFilms
 {
-    type    surfaceFilm;
+    type    surfaceFilms;
     libs    ("libsurfaceFilmModels.so");
 }
 

tutorials/modules/multicomponentFluid/hotBoxes/constant/fvModels

@@ -20,9 +20,9 @@ clouds
     libs    ("liblagrangianParcel.so");
 }
 
-surfaceFilm
+surfaceFilms
 {
-    type    surfaceFilm;
+    type    surfaceFilms;
     libs    ("libsurfaceFilmModels.so");
 }
 

tutorials/modules/multicomponentFluid/hotBoxes/constant/surfaceFilmProperties

@@ -68,7 +68,6 @@ ejection
 
     drippingEjection
     {
-        cloudName    reactingCloud1;
         deltaStable  0;
 
         particlesPerParcel 100.0;

tutorials/modules/multicomponentFluid/rivuletPanel/constant/fvModels

@@ -14,9 +14,9 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-surfaceFilm
+surfaceFilms
 {
-    type    surfaceFilm;
+    type    surfaceFilms;
     libs    ("libsurfaceFilmModels.so");
 }
 

tutorials/modules/multicomponentFluid/splashPanel/constant/fvModels

@@ -20,9 +20,9 @@ clouds
     libs    ("liblagrangianParcel.so");
 }
 
-surfaceFilm
+surfaceFilms
 {
-    type    surfaceFilm;
+    type    surfaceFilms;
     libs    ("libsurfaceFilmModels.so");
 }