diff --git a/src/finiteVolume/Make/files b/src/finiteVolume/Make/files
index 063b6fc04c..578e893fbc 100644
--- a/src/finiteVolume/Make/files
+++ b/src/finiteVolume/Make/files
@@ -381,8 +381,9 @@ $(porosity)/porosityModel/porosityModelNew.C
$(porosity)/porosityModel/porosityModelList.C
$(porosity)/porosityModel/IOporosityModelList.C
$(porosity)/DarcyForchheimer/DarcyForchheimer.C
-$(porosity)/powerLaw/powerLaw.C
$(porosity)/fixedCoeff/fixedCoeff.C
+$(porosity)/powerLaw/powerLaw.C
+$(porosity)/pressureDrop/pressureDrop.C
MRF = $(general)/MRF
$(MRF)/MRFZone.C
diff --git a/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.C b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.C
new file mode 100644
index 0000000000..7b0a86e4c8
--- /dev/null
+++ b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.C
@@ -0,0 +1,144 @@
+/*---------------------------------------------------------------------------*\
+ ========= |
+ \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
+ \\ / O peration |
+ \\ / A nd | Copyright (C) 2013 OpenFOAM Foundation
+ \\/ M anipulation |
+-------------------------------------------------------------------------------
+License
+ This file is part of OpenFOAM.
+
+ OpenFOAM 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.
+
+ OpenFOAM 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 OpenFOAM. If not, see .
+
+\*---------------------------------------------------------------------------*/
+
+#include "addToRunTimeSelectionTable.H"
+#include "pressureDrop.H"
+#include "fvMatrices.H"
+#include "geometricOneField.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+ namespace porosityModels
+ {
+ defineTypeNameAndDebug(pressureDrop, 0);
+ addToRunTimeSelectionTable(porosityModel, pressureDrop, mesh);
+ }
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
+
+Foam::porosityModels::pressureDrop::pressureDrop
+(
+ const word& name,
+ const word& modelType,
+ const fvMesh& mesh,
+ const dictionary& dict,
+ const word& cellZoneName
+)
+:
+ porosityModel(name, modelType, mesh, dict, cellZoneName),
+ coordSys_(coeffs_, mesh),
+ mDotvsDp_(DataEntry::New("mDotvsDp", coeffs_)),
+ lRef_(readScalar(coeffs_.lookup("lRef"))),
+ rhoName_(coeffs_.lookupOrDefault("rho", "rho"))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
+
+Foam::porosityModels::pressureDrop::~pressureDrop()
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
+
+void Foam::porosityModels::pressureDrop::correct
+(
+ fvVectorMatrix& UEqn
+) const
+{
+ const vectorField& U = UEqn.psi();
+ const scalarField& V = mesh_.V();
+ scalarField& Udiag = UEqn.diag();
+ vectorField& Usource = UEqn.source();
+
+ scalar rhoScale = 1.0;
+ if (UEqn.dimensions() == dimForce)
+ {
+ const volScalarField& rho =
+ mesh_.lookupObject(rhoName_);
+
+ apply(Udiag, Usource, V, rho, U, rhoScale);
+ }
+ else
+ {
+ coeffs_.lookup("rhoRef") >> rhoScale;
+ apply(Udiag, Usource, V, geometricOneField(), U, rhoScale);
+ }
+
+}
+
+
+void Foam::porosityModels::pressureDrop::correct
+(
+ fvVectorMatrix& UEqn,
+ const volScalarField& rho,
+ const volScalarField&
+) const
+{
+ const vectorField& U = UEqn.psi();
+ const scalarField& V = mesh_.V();
+ scalarField& Udiag = UEqn.diag();
+ vectorField& Usource = UEqn.source();
+
+ apply(Udiag, Usource, V, rho, U, 1.0);
+}
+
+
+void Foam::porosityModels::pressureDrop::correct
+(
+ const fvVectorMatrix& UEqn,
+ volTensorField& AU
+) const
+{
+ const vectorField& U = UEqn.psi();
+
+ scalar rhoScale = 1.0;
+ if (UEqn.dimensions() == dimForce)
+ {
+ const volScalarField& rho =
+ mesh_.lookupObject(rhoName_);
+
+ apply(AU, rho, U, rhoScale);
+ }
+ else
+ {
+ coeffs_.lookup("rhoRef") >> rhoScale;
+ apply(AU, geometricOneField(), U, rhoScale);
+ }
+}
+
+
+void Foam::porosityModels::pressureDrop::writeData(Ostream& os) const
+{
+ os << indent << name_ << endl;
+ dict_.write(os);
+}
+
+
+// ************************************************************************* //
diff --git a/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.H b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.H
new file mode 100644
index 0000000000..b568a8f7cf
--- /dev/null
+++ b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDrop.H
@@ -0,0 +1,206 @@
+/*---------------------------------------------------------------------------*\
+ ========= |
+ \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
+ \\ / O peration |
+ \\ / A nd | Copyright (C) 2013 OpenFOAM Foundation
+ \\/ M anipulation |
+-------------------------------------------------------------------------------
+License
+ This file is part of OpenFOAM.
+
+ OpenFOAM 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.
+
+ OpenFOAM 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 OpenFOAM. If not, see .
+
+Class
+ Foam::pressureDrop
+
+Description
+ Pressure drop porosity model, whereby the user speciefies the pressure
+ drop per unit length as a function of mass flow rate, over a fixed distance.
+
+ Example usage:
+ \verbatim
+ pressureDropCoeffs
+ {
+ coordinateSystem
+ {
+ e1 (1 0 0);
+ e2 (0 1 0);
+ }
+
+ lRef 0.5;
+
+ mDotvsDp table
+ (
+ (0 0)
+ (0.2 20)
+ (0.4 40)
+ (0.6 65)
+ (0.8 95)
+ (1.0 125)
+ (1.5 220)
+ (2.0 320)
+ (2.5 435)
+ (3.0 560)
+ (3.5 700)
+ );
+ }
+ \endverbatim
+
+Note
+ The mDotvsDp entry is a DataEntry type, able to describe the pressure drop
+ per unit length as a function mass flow rate. The example above gives the
+ usage for supplying in-line tabulated data.
+
+SeeAlso
+ Foam::DataEntry
+
+SourceFiles
+ pressureDrop.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef pressureDrop_H
+#define pressureDrop_H
+
+#include "porosityModel.H"
+#include "coordinateSystem.H"
+#include "autoPtr.H"
+#include "DataEntry.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace porosityModels
+{
+
+/*---------------------------------------------------------------------------*\
+ Class pressureDrop Declaration
+\*---------------------------------------------------------------------------*/
+
+class pressureDrop
+:
+ public porosityModel
+{
+private:
+
+ // Private data
+
+ //- Local co-ordinate system
+ coordinateSystem coordSys_;
+
+ //- Pressure drop per unit length [Pa/m] as a function of
+ // mass flow rate [kg/s]
+ autoPtr > mDotvsDp_;
+
+ //- Distance over which pressure drop is applied
+ scalar lRef_;
+
+ //- Name of density field
+ word rhoName_;
+
+
+ // Private Member Functions
+
+ //- Apply
+ template
+ void apply
+ (
+ scalarField& Udiag,
+ vectorField& Usource,
+ const scalarField& V,
+ const RhoFieldType& rho,
+ const vectorField& U,
+ const scalar rhoScale
+ ) const;
+
+ //- Apply
+ template
+ void apply
+ (
+ tensorField& AU,
+ const RhoFieldType& rho,
+ const vectorField& U,
+ const scalar rhoScale
+ ) const;
+
+ //- Disallow default bitwise copy construct
+ pressureDrop(const pressureDrop&);
+
+ //- Disallow default bitwise assignment
+ void operator=(const pressureDrop&);
+
+
+public:
+
+ //- Runtime type information
+ TypeName("pressureDrop");
+
+ //- Constructor
+ pressureDrop
+ (
+ const word& name,
+ const word& modelType,
+ const fvMesh& mesh,
+ const dictionary& dict,
+ const word& cellZoneName
+ );
+
+ //- Destructor
+ virtual ~pressureDrop();
+
+
+ // Member Functions
+
+ //- Add resistance
+ virtual void correct(fvVectorMatrix& UEqn) const;
+
+ //- Add resistance
+ virtual void correct
+ (
+ fvVectorMatrix& UEqn,
+ const volScalarField& rho,
+ const volScalarField& mu
+ ) const;
+
+ //- Add resistance
+ virtual void correct
+ (
+ const fvVectorMatrix& UEqn,
+ volTensorField& AU
+ ) const;
+
+
+ // I-O
+
+ //- Write
+ void writeData(Ostream& os) const;
+};
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace porosityModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#ifdef NoRepository
+ #include "pressureDropTemplates.C"
+#endif
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //
diff --git a/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDropTemplates.C b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDropTemplates.C
new file mode 100644
index 0000000000..0dc6e6e131
--- /dev/null
+++ b/src/finiteVolume/cfdTools/general/porosityModel/pressureDrop/pressureDropTemplates.C
@@ -0,0 +1,89 @@
+/*---------------------------------------------------------------------------*\
+ ========= |
+ \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
+ \\ / O peration |
+ \\ / A nd | Copyright (C) 2013 OpenFOAM Foundation
+ \\/ M anipulation |
+-------------------------------------------------------------------------------
+License
+ This file is part of OpenFOAM.
+
+ OpenFOAM 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.
+
+ OpenFOAM 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 OpenFOAM. If not, see .
+
+\*---------------------------------------------------------------------------*/
+
+template
+void Foam::porosityModels::pressureDrop::apply
+(
+ scalarField& Udiag,
+ vectorField& Usource,
+ const scalarField& V,
+ const RhoFieldType& rho,
+ const vectorField& U,
+ const scalar rhoScale
+) const
+{
+ // local-to-global transformation tensor
+ const tensor& E = coordSys_.R();
+
+ forAll(cellZoneIds_, zoneI)
+ {
+ const labelList& cells = mesh_.cellZones()[cellZoneIds_[zoneI]];
+
+ forAll(cells, i)
+ {
+ const label cellI = cells[i];
+ const scalar magU = mag(U[cellI]);
+ const scalar mDot = rho[cellI]*magU;
+ const scalar dp = mDotvsDp_->value(mDot);
+ const tensor Cd = E*dp/(lRef_*magU*rhoScale + ROOTVSMALL);
+ const scalar isoCd = tr(Cd);
+
+ Udiag[cellI] += V[cellI]*isoCd;
+ Usource[cellI] -= V[cellI]*((Cd - I*isoCd) & U[cellI]);
+ }
+ }
+}
+
+
+template
+void Foam::porosityModels::pressureDrop::apply
+(
+ tensorField& AU,
+ const RhoFieldType& rho,
+ const vectorField& U,
+ const scalar rhoScale
+) const
+{
+ // local-to-global transformation tensor
+ const tensor& E = coordSys_.R();
+
+ forAll(cellZoneIds_, zoneI)
+ {
+ const labelList& cells = mesh_.cellZones()[cellZoneIds_[zoneI]];
+
+ forAll(cells, i)
+ {
+ const label cellI = cells[i];
+ const scalar magU = mag(U[cellI]);
+ const scalar mDot = rho[cellI]*magU;
+ const scalar dp = mDotvsDp_->value(mDot);
+
+ AU[cellI] += E*dp/(lRef_*magU*rhoScale + ROOTVSMALL);
+ }
+ }
+}
+
+
+// ************************************************************************* //