Add fieldAverage function object

Author: phresher

abruptContraction/interPhaseChangeFoam/system/controlDict

@@ -22,15 +22,15 @@ startTime               0;
 
 stopAt                  endTime;
 
-endTime                 0.01;
+endTime                 1;
 
 deltaT                  1e-5;
 
 writeControl            adjustableRunTime;
 
 writeInterval           0.001;
 
-purgeWrite              0;
+purgeWrite              1;
 
 writeFormat             ascii;
 
@@ -42,14 +42,37 @@ timeFormat              general;
 
 runTimeModifiable       yes;
 
-adjustTimeStep          off;
+adjustTimeStep          on;
 
 maxCo                   1;
 
 functions
 {
     #includeFunc "surfaces"
     #includeFunc "probes"
+    
+    fieldAverage1
+    {
+        type            fieldAverage;
+        libs            ("libfieldFunctionObjects.so");
+        writeControl    writeTime;
+
+        fields
+        (
+            U
+            {
+                mean        on;
+                prime2Mean  on;
+                base        time;
+            }
+            p_rgh
+            {
+                mean        on;
+                prime2Mean  on;
+                base        time;
+            }
+        );
+    }
 }
 
 // ************************************************************************* //