ENH: Added binary operations to fieldValueDelta function object

src/postProcessing/functionObjects/field/fieldValues/fieldValueDelta/fieldValueDelta.C

@@ -29,7 +29,24 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-defineTypeNameAndDebug(Foam::fieldValues::fieldValueDelta, 0);
+namespace Foam
+{
+    defineTypeNameAndDebug(Foam::fieldValues::fieldValueDelta, 0);
+
+    template<>
+    const char*
+    NamedEnum<fieldValues::fieldValueDelta::operationType, 4>::names[] =
+    {
+        "add",
+        "subtract",
+        "min",
+        "max"
+    };
+
+    const Foam::NamedEnum<Foam::fieldValues::fieldValueDelta::operationType, 4>
+        Foam::fieldValues::fieldValueDelta::operationTypeNames_;
+}
+
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
@@ -60,6 +77,7 @@ Foam::fieldValues::fieldValueDelta::fieldValueDelta
     obr_(obr),
     loadFromFiles_(loadFromFiles),
     log_(false),
+    operation_(opSubtract),
     source1Ptr_(NULL),
     source2Ptr_(NULL)
 {
@@ -82,14 +100,20 @@ void Foam::fieldValues::fieldValueDelta::writeFileHeader(const label i)
         }
     }
 
-    file() << "# Time";
+    Ostream& os = file();
+
+    os  << "# Source1   : " << source1Ptr_->name() << nl
+        << "# Source2   : " << source2Ptr_->name() << nl
+        << "# Operation : " << operationTypeNames_[operation_] << nl;
+
+    os  << "# Time";
 
     forAll(commonFields, i)
     {
-        file()<< tab << commonFields[i];
+        os  << tab << commonFields[i];
     }
 
-    file() << endl;
+    os  << endl;
 }
 
 
@@ -126,6 +150,8 @@ void Foam::fieldValues::fieldValueDelta::read(const dictionary& dict)
             false
         ).ptr()
     );
+
+    operation_ = operationTypeNames_.read(dict.lookup("operation"));
 }
 
 

src/postProcessing/functionObjects/field/fieldValues/fieldValueDelta/fieldValueDelta.H

@@ -85,6 +85,19 @@ class fieldValueDelta
 :
     public functionObjectFile
 {
+public:
+        //- Operation type enumeration
+        enum operationType
+        {
+            opAdd,
+            opSubtract,
+            opMin,
+            opMax
+        };
+
+        //- Operation type names
+        static const NamedEnum<operationType, 4> operationTypeNames_;
+
 
 private:
 
@@ -102,6 +115,9 @@ private:
         //- Switch to send output to Info as well as to file
         Switch log_;
 
+        //- Operation to apply to values
+        operationType operation_;
+
         //- Field value source object 1
         autoPtr<fieldValue> source1Ptr_;
 
@@ -115,6 +131,10 @@ private:
         template<class Type>
         void processFields(bool& found);
 
+        //- Templated function to apply the operation
+        template<class Type>
+        Type applyOperation(const Type& value1, const Type& value2) const;
+
 
 protected:
 

src/postProcessing/functionObjects/field/fieldValues/fieldValueDelta/fieldValueDeltaTemplates.C

@@ -28,6 +28,57 @@ License
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
+template<class Type>
+Type Foam::fieldValues::fieldValueDelta::applyOperation
+(
+    const Type& value1,
+    const Type& value2
+) const
+{
+    Type result = pTraits<Type>::zero;
+
+    switch (operation_)
+    {
+        case opAdd:
+        {
+            result = value1 + value2;
+            break;
+        }
+        case opSubtract:
+        {
+            result = value1 - value2;
+            break;
+        }
+        case opMin:
+        {
+            result = min(value1, value2);
+            break;
+        }
+        case opMax:
+        {
+            result = max(value1, value2);
+            break;
+        }
+        default:
+        {
+            FatalErrorIn
+            (
+                "Type Foam::fieldValues::fieldValueDelta::applyOperation"
+                "("
+                    "const Type&, "
+                    "const Type&"
+                ") const"
+            )
+                << "Unable to process operation "
+                << operationTypeNames_[operation_]
+                << abort(FatalError);
+        }
+    }
+
+    return result;
+}
+
+
 template<class Type>
 void Foam::fieldValues::fieldValueDelta::processFields(bool& found)
 {
@@ -49,15 +100,18 @@ void Foam::fieldValues::fieldValueDelta::processFields(bool& found)
             results1.lookup(fieldName) >> r1;
             results2.lookup(fieldName) >> r2;
 
+            Type result = applyOperation(r1, r2);
+
             if (log_)
             {
-                Info<< "    field: " << fieldName << ", delta: " << r2 - r1
+                Info<< "    " << operationTypeNames_[operation_]
+                    << "(" << fieldName << ") = " << result
                     << endl;
             }
 
             if (Pstream::master())
             {
-                file()<< tab << r2 - r1;
+                file()<< tab << result;
             }
 
             found = true;