potentialFoam: Solve for velocity potential named Phi rather than using the pressure field for this purpose

The Phi field is read if available otherwise created automatically with
boundary conditions obtained automatically from the pressure field if
available (with optional name) otherwise inferred from the velocity
field.  Phi Laplacian scheme and solver specification are required.  See
tutorials for examples.

tutorials/basic/potentialFoam/cylinder/Allrun

@@ -6,26 +6,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 
 application=`getApplication`
 
-
-# This case uses the #codeStream which is disabled by default. Enable for
-# just this case.
-MAIN_CONTROL_DICT=`foamEtcFile controlDict`
-if [ -f "$MAIN_CONTROL_DICT" ]
-then
-    echo "Modifying ${MAIN_CONTROL_DICT} to enable allowSystemOperations"
-
-    # Clean up on termination and on Ctrl-C
-    trap 'mv ${MAIN_CONTROL_DICT}.$$ ${MAIN_CONTROL_DICT} 2>/dev/null; exit 0' \
-        EXIT TERM INT
-    cp ${MAIN_CONTROL_DICT} ${MAIN_CONTROL_DICT}.$$
-
-    echo "Enabling allowSystemOperations in ${MAIN_CONTROL_DICT}."
-
-    sed \
-    -e s/"\(allowSystemOperations[ \t]*\)\([0-9]\);"/"\1 1;"/g \
-    ${MAIN_CONTROL_DICT}.$$ > ${MAIN_CONTROL_DICT}
-fi
-
 cp -r 0.org 0 > /dev/null 2>&1
 runApplication blockMesh
 runApplication $application

tutorials/basic/potentialFoam/cylinder/system/fvSchemes

@@ -48,7 +48,7 @@ snGradSchemes
 fluxRequired
 {
     default         no;
-    p               ;
+    Phi             ;
 }
 
 

tutorials/basic/potentialFoam/cylinder/system/fvSolution

@@ -17,7 +17,7 @@ FoamFile
 
 solvers
 {
-    p
+    Phi
     {
         solver          PCG;
         preconditioner  DIC;

tutorials/basic/potentialFoam/pitzDaily/system/fvSchemes

@@ -48,7 +48,7 @@ snGradSchemes
 fluxRequired
 {
     default         no;
-    p               ;
+    Phi             ;
 }
 
 

tutorials/basic/potentialFoam/pitzDaily/system/fvSolution

@@ -17,7 +17,7 @@ FoamFile
 
 solvers
 {
-    p
+    Phi
     {
         solver          PCG;
         preconditioner  DIC;