compressible::alphatWallBoilingWallFunction: Improved solution procedure

This boundary condition now solves for the wall temperature by interval
bisection, which should be significantly more robust than the previous
fixed-point iteration procedure. There is a new non-dimensional
"tolerance" setting that controls how tightly this solution procedure
solves the wall temperature. The "relax" setting is no longer used.

The boundary condition no longer triggers re-evaluation of the
temperature condition in order to re-calculate the heat flux within the
solution iteration. Instead, it extracts physical coefficients from the
form of the boundary condition and uses these to form a linearised
approximation of the heat flux. This is a more general approach, and
will not trigger side-effects associated with re-evaluating the
temperature condition.

The fixedMultiphaseHeatFlux condition has been replaced by a
uniformFixedMultiphaseHeatFlux condition, which constructs a mixed
constraint which portions a specified heat flux between the phases in
such a way as to keep the boundary temperature uniform across all
phases. This can be applied to all phases. It is no longer necessary to
apply a heat flux model to one "master" phase, then map the resulting
temperature to the others. An example specification of this boundary
condition is as follows:

    wall
    {
        type            uniformFixedMultiphaseHeatFlux;
        q               1000;
        relax           0.3;
        value           $internalField;
    }

The wall boiling tutorials have been updated to use these new functions,
and time-varying heat input has been used to replace the
stop-modify-restart pattern present in the single-region cases.

tutorials/modules/CHT/wallBoiling/0/fluid/alphat.gas

@@ -35,13 +35,10 @@ boundaryField
         otherPhase      liquid;
         phaseType       vapor;
         Prt             0.85;
-        Cmu             0.09;
-        kappa           0.41;
-        E               9.8;
         partitioningModel
         {
-            type        Lavieville;
-            alphaCrit   0.2;
+            type            Lavieville;
+            alphaCrit       0.2;
         }
         value           uniform 0;
     }

tutorials/modules/CHT/wallBoiling/0/fluid/alphat.liquid

@@ -32,31 +32,27 @@ boundaryField
     wall
     {
         type            compressible::alphatWallBoilingWallFunction;
-        Prt             0.85;
-        Cmu             0.09;
-        kappa           0.41;
-        E               9.8;
-        relax           1.0;
         otherPhase      gas;
         phaseType       liquid;
+        Prt             0.85;
         partitioningModel
         {
-            type        Lavieville;
-            alphaCrit   0.2;
+            type            Lavieville;
+            alphaCrit       0.2;
         }
         nucleationSiteModel
         {
-            type        LemmertChawla;
-            Cn          1;
-            NRef        30000000;
-            deltaTRef   10;
+            type            LemmertChawla;
+            Cn              1;
+            NRef            30000000;
+            deltaTRef       10;
         }
         departureDiamModel
         {
-            type        TolubinskiKostanchuk;
-            dRef        0.00024;
-            dMax        0.0014;
-            dMin        1e-06;
+            type            TolubinskiKostanchuk;
+            dRef            0.00024;
+            dMax            0.0014;
+            dMin            1e-06;
         }
         departureFreqModel
         {

tutorials/modules/CHT/wallBoiling/Allrun

@@ -7,7 +7,7 @@ cd ${0%/*} || exit 1    # run from this directory
 runApplication blockMesh
 runApplication extrudeMesh
 runApplication splitMeshRegions -cellZones -overwrite
-runApplication foamDictionary constant/fluid/polyMesh/boundary -entry entry0/inlet/neighbourRegion -set "fluid"
+
 paraFoam -region fluid -touch
 paraFoam -region solid -touch
 
@@ -16,6 +16,7 @@ runApplication decomposePar -allRegions
 runParallel $(getApplication)
 
 runApplication reconstructPar -latestTime -allRegions
+
 runApplication foamPostProcess -latestTime -region fluid -func "
     graphCell
     (
@@ -24,9 +25,6 @@ runApplication foamPostProcess -latestTime -region fluid -func "
         end=(3.4901 0.0096 0),
         fields=(alpha.gas T.liquid T.gas)
     )"
-
-./validation/createGraphs
-
 runApplication -append foamPostProcess  -region fluid -latestTime -func "
     patchSurface
     (
@@ -37,6 +35,10 @@ runApplication -append foamPostProcess  -region fluid -latestTime -func "
         fields=(dDeparture.liquid fDeparture.liquid nucleationSiteDensity.liquid wetFraction.liquid qQuenching.liquid qEvaporative.liquid)
     )"
 
-./validation/createWallBoilingPropertiesGraphs
+if ! isTest "$@"
+then
+    ./validation/createGraphs
+    ./validation/createWallBoilingPropertiesGraphs
+fi
 
 #------------------------------------------------------------------------------