diff --git a/src/fieldSources/basicSource/basicSource.C b/src/fieldSources/basicSource/basicSource.C
index 9ebcdc5834..64be60fa84 100644
--- a/src/fieldSources/basicSource/basicSource.C
+++ b/src/fieldSources/basicSource/basicSource.C
@@ -481,4 +481,36 @@ void Foam::basicSource::setValue(fvMatrix<tensor>& eqn, const label fieldI)
 }
 
 
+void Foam::basicSource::relativeFlux(surfaceScalarField& phi) const
+{
+    // do nothing
+}
+
+
+void Foam::basicSource::relativeFlux
+(
+    const surfaceScalarField& rho,
+    surfaceScalarField& phi
+) const
+{
+    // do nothing
+}
+
+
+void Foam::basicSource::absoluteFlux(surfaceScalarField& phi) const
+{
+    // do nothing
+}
+
+
+void Foam::basicSource::absoluteFlux
+(
+    const surfaceScalarField& rho,
+    surfaceScalarField& phi
+) const
+{
+    // do nothing
+}
+
+
 // ************************************************************************* //
diff --git a/src/fieldSources/basicSource/basicSource.H b/src/fieldSources/basicSource/basicSource.H
index 69e9dcf408..3e4740cead 100644
--- a/src/fieldSources/basicSource/basicSource.H
+++ b/src/fieldSources/basicSource/basicSource.H
@@ -427,6 +427,29 @@ public:
                 );
 
 
+            // Flux manipulations
+
+                //- Make the given absolute flux relative
+                virtual void relativeFlux(surfaceScalarField& phi) const;
+
+                //- Make the given absolute mass-flux relative
+                virtual void relativeFlux
+                (
+                    const surfaceScalarField& rho,
+                    surfaceScalarField& phi
+                ) const;
+
+                //- Make the given relative flux absolute
+                virtual void absoluteFlux(surfaceScalarField& phi) const;
+
+                //- Make the given relative mass-flux absolute
+                virtual void absoluteFlux
+                (
+                    const surfaceScalarField& rho,
+                    surfaceScalarField& phi
+                ) const;
+
+
         // I-O
 
             //- Write the source header information
diff --git a/src/fieldSources/basicSource/basicSourceList.C b/src/fieldSources/basicSource/basicSourceList.C
index 2d484868a4..a7224e9a6c 100644
--- a/src/fieldSources/basicSource/basicSourceList.C
+++ b/src/fieldSources/basicSource/basicSourceList.C
@@ -108,6 +108,50 @@ void Foam::basicSourceList::reset(const dictionary& dict)
 }
 
 
+void Foam::basicSourceList::relativeFlux(surfaceScalarField& phi) const
+{
+    forAll(*this, i)
+    {
+        this->operator[](i).relativeFlux(phi);
+    }
+}
+
+
+void Foam::basicSourceList::relativeFlux
+(
+    const surfaceScalarField& rho,
+    surfaceScalarField& phi
+) const
+{
+    forAll(*this, i)
+    {
+        this->operator[](i).relativeFlux(rho, phi);
+    }
+}
+
+
+void Foam::basicSourceList::absoluteFlux(surfaceScalarField& phi) const
+{
+    forAll(*this, i)
+    {
+        this->operator[](i).absoluteFlux(phi);
+    }
+}
+
+
+void Foam::basicSourceList::absoluteFlux
+(
+    const surfaceScalarField& rho,
+    surfaceScalarField& phi
+) const
+{
+    forAll(*this, i)
+    {
+        this->operator[](i).absoluteFlux(rho, phi);
+    }
+}
+
+
 bool Foam::basicSourceList::read(const dictionary& dict)
 {
     checkTimeIndex_ = mesh_.time().timeIndex() + 2;
diff --git a/src/fieldSources/basicSource/basicSourceList.H b/src/fieldSources/basicSource/basicSourceList.H
index 5f5e053a94..002d23b1fb 100644
--- a/src/fieldSources/basicSource/basicSourceList.H
+++ b/src/fieldSources/basicSource/basicSourceList.H
@@ -152,6 +152,29 @@ public:
             void constrain(fvMatrix<Type>& eqn, const word& fieldName);
 
 
+        // Flux manipulations
+
+            //- Make the given absolute flux relative
+            void relativeFlux(surfaceScalarField& phi) const;
+
+            //- Make the given absolute mass-flux relative
+            void relativeFlux
+            (
+                const surfaceScalarField& rho,
+                surfaceScalarField& phi
+            ) const;
+
+            //- Make the given relative flux absolute
+            void absoluteFlux(surfaceScalarField& phi) const;
+
+            //- Make the given relative mass-flux absolute
+            void absoluteFlux
+            (
+                const surfaceScalarField& rho,
+                surfaceScalarField& phi
+            ) const;
+
+
         // I-O
 
             //- Read dictionary