diff --git a/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.C b/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.C
new file mode 100644
index 00000000..cdd8c843
--- /dev/null
+++ b/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.C
@@ -0,0 +1,97 @@
+/*---------------------------------------------------------------------------*\
+License
+    This is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    This code is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+    You should have received a copy of the GNU General Public License
+    along with this code.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright (C) 2015- Thomas Lichtenegger, JKU Linz, Austria
+
+\*---------------------------------------------------------------------------*/
+
+#include "error.H"
+#include "secondaryPhaseInducedBuoyancy.H"
+#include "mathExtra.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+defineTypeNameAndDebug(secondaryPhaseInducedBuoyancy, 0);
+
+addToRunTimeSelectionTable(otherForceModel, secondaryPhaseInducedBuoyancy, dictionary);
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+// Construct from components
+secondaryPhaseInducedBuoyancy::secondaryPhaseInducedBuoyancy
+(
+    const dictionary& dict,
+    cfdemCloud& sm
+)
+:
+    otherForceModel(dict,sm),
+    propsDict_(dict.subDict(typeName + "Props")),
+    voidfractionFieldName_(propsDict_.lookupOrDefault<word>("voidfractionFieldName","voidfraction")),
+    voidfraction_(sm.mesh().lookupObject<volScalarField> (voidfractionFieldName_)),
+    diffRho_("diffRho",dimensionSet(1,-3,0,0,0),0.0),
+    g_("g",dimensionSet(0,1,-2,0,0),vector(0,0,-9.81))
+{
+    if (propsDict_.found("diffRho"))
+        diffRho_.value()=readScalar(propsDict_.lookup ("diffRho"));
+    else
+        FatalError <<"Please specify density difference of the phases.\n" << abort(FatalError);
+}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+secondaryPhaseInducedBuoyancy::~secondaryPhaseInducedBuoyancy()
+{}
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+tmp<volVectorField> secondaryPhaseInducedBuoyancy::exportForceField()
+{
+    tmp<volVectorField> tsource
+    (
+        new volVectorField
+        (
+            IOobject
+            (
+                "secondaryPhaseInducedBuoyancy",
+                particleCloud_.mesh().time().timeName(),
+                particleCloud_.mesh(),
+                IOobject::NO_READ,
+                IOobject::NO_WRITE
+            ),
+            particleCloud_.mesh(),
+            dimensionedVector
+            (
+                "zero",dimensionSet(1, -2, -2, 0, 0),vector::zero
+            )
+        )
+    );
+
+    volVectorField& source = tsource.ref();
+
+    source = diffRho_ * (1.0-voidfraction_) * g_;
+
+    return tsource;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// ************************************************************************* //
diff --git a/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.H b/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.H
new file mode 100644
index 00000000..1bf6ccd6
--- /dev/null
+++ b/src/lagrangian/cfdemParticle/subModels/otherForceModel/secondaryPhaseInducedBuoyancy/secondaryPhaseInducedBuoyancy.H
@@ -0,0 +1,95 @@
+/*---------------------------------------------------------------------------*\
+License
+    This is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    This code is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+    You should have received a copy of the GNU General Public License
+    along with this code.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright (C) 2015- Thomas Lichtenegger, JKU Linz, Austria
+
+
+Class
+    secondaryPhaseInducedBuoyancy
+
+SourceFiles
+    secondaryPhaseInducedBuoyancy.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef secondaryPhaseInducedBuoyancy_H
+#define secondaryPhaseInducedBuoyancy_H
+
+#include "otherForceModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                           Class secondaryPhaseInducedBuoyancy Declaration
+\*---------------------------------------------------------------------------*/
+
+class secondaryPhaseInducedBuoyancy
+:
+    public otherForceModel
+{
+
+protected:
+
+    // Protected data
+        dictionary propsDict_;
+
+        word voidfractionFieldName_;
+
+        const volScalarField& voidfraction_;
+
+        // density dispersed phase - density continuous phase
+        dimensionedScalar diffRho_;
+
+        const dimensionedVector g_;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("secondaryPhaseInducedBuoyancy");
+
+    // Constructors
+
+        //- Construct from components
+        secondaryPhaseInducedBuoyancy
+        (
+            const dictionary& dict,
+            cfdemCloud& sm
+        );
+
+
+    // Destructor
+
+        virtual ~secondaryPhaseInducedBuoyancy();
+
+
+    // Member Functions
+
+
+        tmp<volVectorField> exportForceField();
+
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //