ENH: forces/forceCoeffs FOs updated follwing changes to functionObjectFile

src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -28,6 +28,9 @@ License
 #include "Time.H"
 #include "Pstream.H"
 #include "IOmanip.H"
+#include "fvMesh.H"
+#include "dimensionedTypes.H"
+#include "volFields.H"
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
@@ -39,81 +42,157 @@ namespace Foam
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
-void Foam::forceCoeffs::writeFileHeader(const label i)
+void Foam::forceCoeffs::createFiles()
 {
-    if (i == 0)
+    // Note: Only possible to create bin files after bins have been initialised
+
+    if (writeToFile() && !coeffFilePtr_.valid())
+    {
+        coeffFilePtr_ = createFile("coefficient");
+        writeIntegratedHeader("Coefficients", coeffFilePtr_());
+
+        if (nBin_ > 1)
+        {
+            CmBinFilePtr_ = createFile("CmBin");
+            writeBinHeader("Moment coefficient bins", CmBinFilePtr_());
+            CdBinFilePtr_ = createFile("CdBin");
+            writeBinHeader("Drag coefficient bins", CdBinFilePtr_());
+            ClBinFilePtr_ = createFile("ClBin");
+            writeBinHeader("Lift coefficient bins", ClBinFilePtr_());
+        }
+    }
+}
+
+
+void Foam::forceCoeffs::writeIntegratedHeader
+(
+    const word& header,
+    Ostream& os
+) const
+{
+    writeHeader(os, "Force coefficients");
+    writeHeaderValue(os, "liftDir", liftDir_);
+    writeHeaderValue(os, "dragDir", dragDir_);
+    writeHeaderValue(os, "pitchAxis", pitchAxis_);
+    writeHeaderValue(os, "magUInf", magUInf_);
+    writeHeaderValue(os, "lRef", lRef_);
+    writeHeaderValue(os, "Aref", Aref_);
+    writeHeaderValue(os, "CofR", coordSys_.origin());
+    writeHeader(os, "");
+    writeCommented(os, "Time");
+    writeTabbed(os, "Cm");
+    writeTabbed(os, "Cd");
+    writeTabbed(os, "Cl");
+    writeTabbed(os, "Cl(f)");
+    writeTabbed(os, "Cl(r)");
+    os  << endl;
+}
+
+
+void Foam::forceCoeffs::writeBinHeader
+(
+    const word& header,
+    Ostream& os
+) const
+{
+    writeHeader(os, header);
+    writeHeaderValue(os, "bins", nBin_);
+    writeHeaderValue(os, "start", binMin_);
+    writeHeaderValue(os, "delta", binDx_);
+    writeHeaderValue(os, "direction", binDir_);
+
+    vectorField binPoints(nBin_);
+    writeCommented(os, "x co-ords  :");
+    forAll(binPoints, pointI)
     {
-        // force coeff data
-
-        writeHeader(file(i), "Force coefficients");
-        writeHeaderValue(file(i), "liftDir", liftDir_);
-        writeHeaderValue(file(i), "dragDir", dragDir_);
-        writeHeaderValue(file(i), "pitchAxis", pitchAxis_);
-        writeHeaderValue(file(i), "magUInf", magUInf_);
-        writeHeaderValue(file(i), "lRef", lRef_);
-        writeHeaderValue(file(i), "Aref", Aref_);
-        writeHeaderValue(file(i), "CofR", coordSys_.origin());
-        writeCommented(file(i), "Time");
-        writeTabbed(file(i), "Cm");
-        writeTabbed(file(i), "Cd");
-        writeTabbed(file(i), "Cl");
-        writeTabbed(file(i), "Cl(f)");
-        writeTabbed(file(i), "Cl(r)");
-        file(i)
-            << tab << "Cm" << tab << "Cd" << tab << "Cl" << tab << "Cl(f)"
-            << tab << "Cl(r)";
+        binPoints[pointI] = (binMin_ + (pointI + 1)*binDx_)*binDir_;
+        os << tab << binPoints[pointI].x();
     }
-    else if (i == 1)
+    os << nl;
+
+    writeCommented(os, "y co-ords  :");
+    forAll(binPoints, pointI)
     {
-        // bin coeff data
+        os << tab << binPoints[pointI].y();
+    }
+    os << nl;
 
-        writeHeader(file(i), "Force coefficient bins");
-        writeHeaderValue(file(i), "bins", nBin_);
-        writeHeaderValue(file(i), "start", binMin_);
-        writeHeaderValue(file(i), "delta", binDx_);
-        writeHeaderValue(file(i), "direction", binDir_);
+    writeCommented(os, "z co-ords  :");
+    forAll(binPoints, pointI)
+    {
+        os << tab << binPoints[pointI].z();
+    }
+    os << nl;
 
-        vectorField binPoints(nBin_);
-        writeCommented(file(i), "x co-ords  :");
-        forAll(binPoints, pointI)
-        {
-            binPoints[pointI] = (binMin_ + (pointI + 1)*binDx_)*binDir_;
-            file(i) << tab << binPoints[pointI].x();
-        }
-        file(i) << nl;
+    writeHeader(os, "");
+    writeCommented(os, "Time");
 
-        writeCommented(file(i), "y co-ords  :");
-        forAll(binPoints, pointI)
-        {
-            file(i) << tab << binPoints[pointI].y();
-        }
-        file(i) << nl;
+    for (label j = 0; j < nBin_; j++)
+    {
+        word jn(Foam::name(j) + ':');
+        writeTabbed(os, jn + "total");
+        writeTabbed(os, jn + "pressure");
+        writeTabbed(os, jn + "viscous");
 
-        writeCommented(file(i), "z co-ords  :");
-        forAll(binPoints, pointI)
+        if (porosity_)
         {
-            file(i) << tab << binPoints[pointI].z();
+            writeTabbed(os, jn + "porous");
         }
-        file(i) << nl;
+    }
+
+    os  << endl;
+}
 
-        writeCommented(file(i), "Time");
 
-        for (label j = 0; j < nBin_; j++)
+void Foam::forceCoeffs::writeIntegratedData
+(
+    const word& title,
+    const List<Field<scalar> >& coeff
+) const
+{
+    scalar pressure = sum(coeff[0]);
+    scalar viscous = sum(coeff[1]);
+    scalar porous = sum(coeff[2]);
+    scalar total = pressure + viscous + porous;
+
+    if (log_)
+    {
+        Info<< "        " << title << "       : " << total << token::TAB
+            << "("
+            << "pressure: " << pressure << token::TAB
+            << "viscous: " << viscous;
+
+        if (porosity_)
         {
-            const word jn('(' + Foam::name(j) + ')');
-            writeTabbed(file(i), "Cm" + jn);
-            writeTabbed(file(i), "Cd" + jn);
-            writeTabbed(file(i), "Cl" + jn);
+            Info<< token::TAB << "porous: " << porous;
         }
+
+        Info<< ")" << endl;
     }
-    else
+}
+
+
+void Foam::forceCoeffs::writeBinData
+(
+    const List<Field<scalar> > coeffs,
+    Ostream& os
+) const
+{
+    os  << obr_.time().value();
+
+    for (label binI = 0; binI < nBin_; binI++)
     {
-        FatalErrorIn("void Foam::forces::writeFileHeader(const label)")
-            << "Unhandled file index: " << i
-            << abort(FatalError);
+        scalar total = coeffs[0][binI] + coeffs[1][binI] + coeffs[2][binI];
+
+        os  << tab << total << tab << coeffs[0][binI] << tab << coeffs[1][binI];
+
+        if (porosity_)
+        {
+            os  << tab << coeffs[2][binI];
+        }
     }
 
-    file(i)<< endl;
+    os  << endl;
 }
 
 
@@ -124,7 +203,8 @@ Foam::forceCoeffs::forceCoeffs
     const word& name,
     const objectRegistry& obr,
     const dictionary& dict,
-    const bool loadFromFiles
+    const bool loadFromFiles,
+    const bool readFields
 )
 :
     forces(name, obr, dict, loadFromFiles, false),
@@ -133,11 +213,17 @@ Foam::forceCoeffs::forceCoeffs
     pitchAxis_(vector::zero),
     magUInf_(0.0),
     lRef_(0.0),
-    Aref_(0.0)
+    Aref_(0.0),
+    coeffFilePtr_(),
+    CmBinFilePtr_(),
+    CdBinFilePtr_(),
+    ClBinFilePtr_()
 {
-    read(dict);
-
-    Info<< endl;
+    if (readFields)
+    {
+        read(dict);
+        if (log_) Info << endl;
+    }
 }
 
 
@@ -151,115 +237,216 @@ Foam::forceCoeffs::~forceCoeffs()
 
 void Foam::forceCoeffs::read(const dictionary& dict)
 {
-    if (active_)
+    if (!active_)
     {
-        forces::read(dict);
-
-        // Directions for lift and drag forces, and pitch moment
-        dict.lookup("liftDir") >> liftDir_;
-        dict.lookup("dragDir") >> dragDir_;
-        dict.lookup("pitchAxis") >> pitchAxis_;
-
-        // Free stream velocity magnitude
-        dict.lookup("magUInf") >> magUInf_;
-
-        // Reference length and area scales
-        dict.lookup("lRef") >> lRef_;
-        dict.lookup("Aref") >> Aref_;
+        return;
     }
-}
-
 
-void Foam::forceCoeffs::execute()
-{
-    // Do nothing - only valid on write
-}
+    forces::read(dict);
 
+    // Directions for lift and drag forces, and pitch moment
+    dict.lookup("liftDir") >> liftDir_;
+    dict.lookup("dragDir") >> dragDir_;
+    dict.lookup("pitchAxis") >> pitchAxis_;
 
-void Foam::forceCoeffs::end()
-{
-    // Do nothing - only valid on write
-}
+    // Free stream velocity magnitude
+    dict.lookup("magUInf") >> magUInf_;
 
+    // Reference length and area scales
+    dict.lookup("lRef") >> lRef_;
+    dict.lookup("Aref") >> Aref_;
 
-void Foam::forceCoeffs::timeSet()
-{
-    // Do nothing - only valid on write
+    if (writeFields_)
+    {
+        const fvMesh& mesh = refCast<const fvMesh>(obr_);
+
+        tmp<volVectorField> tforceCoeff
+        (
+            new volVectorField
+            (
+                IOobject
+                (
+                    fieldName("forceCoeff"),
+                    mesh.time().timeName(),
+                    mesh,
+                    IOobject::NO_READ,
+                    IOobject::NO_WRITE
+                ),
+                mesh,
+                dimensionedVector("0", dimless, vector::zero)
+            )
+        );
+
+        obr_.store(tforceCoeff.ptr());
+
+        tmp<volVectorField> tmomentCoeff
+        (
+            new volVectorField
+            (
+                IOobject
+                (
+                    fieldName("momentCoeff"),
+                    mesh.time().timeName(),
+                    mesh,
+                    IOobject::NO_READ,
+                    IOobject::NO_WRITE
+                ),
+                mesh,
+                dimensionedVector("0", dimless, vector::zero)
+            )
+        );
+
+        obr_.store(tmomentCoeff.ptr());
+    }
 }
 
 
-void Foam::forceCoeffs::write()
+void Foam::forceCoeffs::execute()
 {
-    forces::calcForcesMoment();
-
     if (!active_)
     {
         return;
     }
 
-    if (Pstream::master())
-    {
-        functionObjectFile::write();
+    forces::calcForcesMoment();
+
+    createFiles();
 
-        scalar pDyn = 0.5*rhoRef_*magUInf_*magUInf_;
+    scalar pDyn = 0.5*rhoRef_*magUInf_*magUInf_;
 
-        Field<vector> totForce(force_[0] + force_[1] + force_[2]);
-        Field<vector> totMoment(moment_[0] + moment_[1] + moment_[2]);
+    // Storage for pressure, viscous and porous contributions to coeffs
+    List<Field<scalar> > momentCoeffs(3);
+    List<Field<scalar> > dragCoeffs(3);
+    List<Field<scalar> > liftCoeffs(3);
+    forAll(liftCoeffs, i)
+    {
+        momentCoeffs[i].setSize(nBin_);
+        dragCoeffs[i].setSize(nBin_);
+        liftCoeffs[i].setSize(nBin_);
+    }
 
-        List<Field<scalar> > coeffs(3);
-        coeffs[0].setSize(nBin_);
-        coeffs[1].setSize(nBin_);
-        coeffs[2].setSize(nBin_);
+    // Calculate coefficients
+    scalar CmTot = 0;
+    scalar CdTot = 0;
+    scalar ClTot = 0;
+    forAll(liftCoeffs, i)
+    {
+        momentCoeffs[i] = (moment_[i] & pitchAxis_)/(Aref_*pDyn*lRef_);
+        dragCoeffs[i] = (force_[i] & dragDir_)/(Aref_*pDyn);
+        liftCoeffs[i] = (force_[i] & liftDir_)/(Aref_*pDyn);
 
-        // lift, drag and moment
-        coeffs[0] = (totForce & liftDir_)/(Aref_*pDyn);
-        coeffs[1] = (totForce & dragDir_)/(Aref_*pDyn);
-        coeffs[2] = (totMoment & pitchAxis_)/(Aref_*lRef_*pDyn);
+        CmTot += sum(momentCoeffs[i]);
+        CdTot += sum(dragCoeffs[i]);
+        ClTot += sum(liftCoeffs[i]);
+    }
 
-        scalar Cl = sum(coeffs[0]);
-        scalar Cd = sum(coeffs[1]);
-        scalar Cm = sum(coeffs[2]);
+    scalar ClfTot = ClTot/2.0 + CmTot;
+    scalar ClrTot = ClTot/2.0 - CmTot;
 
-        scalar Clf = Cl/2.0 + Cm;
-        scalar Clr = Cl/2.0 - Cm;
+    if (log_)
+    {
+        Info<< type() << " " << name_ << " output:" << nl
+            << "    Coefficients" << nl;
+    }
+    writeIntegratedData("Cm", momentCoeffs);
+    writeIntegratedData("Cd", dragCoeffs);
+    writeIntegratedData("Cl", liftCoeffs);
+    if (log_)
+    {
+        Info<< "        Cl(f)    : " << ClfTot << nl
+            << "        Cl(r)    : " << ClrTot << nl
+            << endl;
+    }
 
-        file(0)
-            << obr_.time().value() << tab << Cm << tab  << Cd
-            << tab << Cl << tab << Clf << tab << Clr << endl;
+    if (writeToFile())
+    {
+        coeffFilePtr_()
+            << obr_.time().value() << tab << CmTot << tab  << CdTot
+            << tab << ClTot << tab << ClfTot << tab << ClrTot << endl;
 
-        if (log_) Info<< type() << " " << name_ << " output:" << nl
-            << "    Cm    = " << Cm << nl
-            << "    Cd    = " << Cd << nl
-            << "    Cl    = " << Cl << nl
-            << "    Cl(f) = " << Clf << nl
-            << "    Cl(r) = " << Clr << endl;
 
         if (nBin_ > 1)
         {
             if (binCumulative_)
             {
-                for (label i = 1; i < coeffs[0].size(); i++)
+                forAll(liftCoeffs, i)
                 {
-                    coeffs[0][i] += coeffs[0][i-1];
-                    coeffs[1][i] += coeffs[1][i-1];
-                    coeffs[2][i] += coeffs[2][i-1];
+                    for (label binI = 1; binI < nBin_; binI++)
+                    {
+                        liftCoeffs[i][binI] += liftCoeffs[i][binI-1];
+                        dragCoeffs[i][binI] += dragCoeffs[i][binI-1];
+                        momentCoeffs[i][binI] += momentCoeffs[i][binI-1];
+                    }
                 }
             }
 
-            file(1)<< obr_.time().value();
+            writeBinData(dragCoeffs, CdBinFilePtr_());
+            writeBinData(liftCoeffs, ClBinFilePtr_());
+            writeBinData(momentCoeffs, CmBinFilePtr_());
+        }
+    }
 
-            forAll(coeffs[0], i)
-            {
-                file(1)
-                    << tab << coeffs[2][i]
-                    << tab << coeffs[1][i]
-                    << tab << coeffs[0][i];
-            }
+    if (writeFields_)
+    {
+        const volVectorField& force =
+            obr_.lookupObject<volVectorField>(fieldName("force"));
 
-            file(1) << endl;
-        }
+        const volVectorField& moment =
+            obr_.lookupObject<volVectorField>(fieldName("moment"));
+
+        volVectorField& forceCoeff =
+            const_cast<volVectorField&>
+            (
+                obr_.lookupObject<volVectorField>(fieldName("forceCoeff"))
+            );
+
+        volVectorField& momentCoeff =
+            const_cast<volVectorField&>
+            (
+                obr_.lookupObject<volVectorField>(fieldName("momentCoeff"))
+            );
+
+        dimensionedScalar f0("f0", dimForce, Aref_*pDyn);
+        dimensionedScalar m0("m0", dimForce*dimLength, Aref_*lRef_*pDyn);
+
+        forceCoeff == force/f0;
+        momentCoeff == moment/m0;
+    }
+}
+
+
+void Foam::forceCoeffs::end()
+{
+    if (active_)
+    {
+        execute();
+    }
+}
+
+
+void Foam::forceCoeffs::timeSet()
+{
+    // Do nothing
+}
+
+
+void Foam::forceCoeffs::write()
+{
+    if (!active_)
+    {
+        return;
+    }
+
+    if (writeFields_)
+    {
+        const volVectorField& forceCoeff =
+            obr_.lookupObject<volVectorField>(fieldName("forceCoeff"));
+
+        const volVectorField& momentCoeff =
+            obr_.lookupObject<volVectorField>(fieldName("momentCoeff"));
 
-        if (log_) Info<< endl;
+        forceCoeff.write();
+        momentCoeff.write();
     }
 }
 

src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.H

@@ -2,8 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
-     \\/     M anipulation  |
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -32,6 +32,19 @@ Description
     lift, drag and moment coefficients.  The data can optionally be output into
     bins, defined in a given direction.
 
+    The binned data provides the total and consitituentcomponents per bin:
+    - total coefficient
+    - pressure coefficient contribution
+    - viscous coefficient contribution
+    - porous coefficient contribution
+
+    Data is written into multiple files in the
+    postProcessing/\<functionObjectName\> directory:
+    - coefficient.dat   : integrated coefficients over all geometries
+    - CmBin.dat         : moment coefficient bins
+    - CdBin.dat         : drag coefficient bins
+    - ClBin.dat         : lift coefficient bins
+
     Example of function object specification:
     \verbatim
     forceCoeffs1
@@ -40,6 +53,7 @@ Description
         functionObjectLibs ("libforces.so");
         ...
         log         yes;
+        writeFields yes;
         patches     (walls);
         liftDir     (0 1 0);
         dragDir     (-1 0 0);
@@ -62,6 +76,7 @@ Description
         Property     | Description             | Required    | Default value
         type         | type name: forces       | yes         |
         log          | write force data to standard output | no | no
+        writeFields  | write the force and moment coefficient fields | no | no
         patches      | patches included in the forces calculation | yes |
         liftDir      | lift direction          | yes         |
         dragDir      | drag direction          | yes         |
@@ -137,6 +152,21 @@ class forceCoeffs
             scalar Aref_;
 
 
+        // File streams
+
+            //- Integrated coefficients
+            autoPtr<OFstream> coeffFilePtr_;
+
+            //- Moment coefficient
+            autoPtr<OFstream> CmBinFilePtr_;
+
+            //- Drag coefficient
+            autoPtr<OFstream> CdBinFilePtr_;
+
+            //- Lift coefficient
+            autoPtr<OFstream> ClBinFilePtr_;
+
+
     // Private Member Functions
 
         //- Disallow default bitwise copy construct
@@ -148,8 +178,26 @@ class forceCoeffs
 
 protected:
 
-    //- Output file header information
-    virtual void writeFileHeader(const label i);
+    // Protected Member Functions
+
+        //- Create the output files
+        void createFiles();
+
+        //- Write header for integrated data
+        void writeIntegratedHeader(const word& header, Ostream& os) const;
+
+        //- Write header for binned data
+        void writeBinHeader(const word& header, Ostream& os) const;
+
+        //- Write integrated data
+        void writeIntegratedData
+        (
+            const word& title,
+            const List<Field<scalar> >& coeff
+        ) const;
+
+        //- Write binned data
+        void writeBinData(const List<Field<scalar> > coeffs, Ostream& os) const;
 
 
 public:
@@ -167,7 +215,8 @@ public:
             const word& name,
             const objectRegistry&,
             const dictionary&,
-            const bool loadFromFiles = false
+            const bool loadFromFiles = false,
+            const bool readFields = true
         );
 
 

src/postProcessing/functionObjects/forces/forces/forces.H

@@ -2,8 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
-     \\/     M anipulation  |
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -29,11 +29,24 @@ Group
 
 Description
     This function object calculates the forces and moments by integrating the
-    pressure and skin-friction forces over a given list of patches.
-
-    Member function forces::write() calculates the forces/moments and
-    writes the forces/moments into the file \<timeDir\>/forces.dat and bin
-    data (if selected) to the file \<timeDir\>/forces_bin.dat
+    pressure and skin-friction forces over a given list of patches, and
+    the resistance from porous zones.
+
+    Forces and moments are calculated, with optional co-ordinate system and
+    writing of binned data, where force and moment contributions are collected
+    into a user-defined number of bins that span the input geometries for a
+    user-defined direction vector.
+
+    Data is written into multiple files in the
+    postProcessing/\<functionObjectName\> directory:
+    - force.dat          : forces in global Cartesian co-ordinate system
+    - moment.dat         : moments in global Cartesian co-ordinate system
+    - forceBin.dat       : force bins in global Cartesian co-ordinate system
+    - momentBin.dat      : moment bins in global Cartesian co-ordinate system
+    - localForce.dat     : forces in local co-ordinate system
+    - localMoment.dat    : moments in local co-ordinate system
+    - localForceBin.dat  : force bins in local co-ordinate system
+    - localMomentBin.dat : moment bins in local co-ordinate system
 
     Example of function object specification:
     \verbatim
@@ -43,6 +56,7 @@ Description
         functionObjectLibs ("libforces.so");
         ...
         log         yes;
+        writeFields yes;
         patches     (walls);
 
         binData
@@ -59,6 +73,7 @@ Description
         Property     | Description             | Required    | Default value
         type         | type name: forces       | yes         |
         log          | write force data to standard output | no | no
+        writeFields  | write the force and moment fields | no | no
         patches      | patches included in the forces calculation | yes |
         pName        | pressure field name     | no          | p
         UName        | velocity field name     | no          | U
@@ -101,6 +116,7 @@ Note
 
 SeeAlso
     Foam::functionObject
+    Foam::functionObjectFile
     Foam::OutputFilterFunctionObject
     Foam::forceCoeffs
 
@@ -122,7 +138,6 @@ SourceFiles
 #include "Tuple2.H"
 #include "OFstream.H"
 #include "Switch.H"
-#include "writer.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -165,6 +180,32 @@ protected:
         //- Pressure, viscous and porous moment per bin
         List<Field<vector> > moment_;
 
+        // File streams
+
+            //- Forces
+            autoPtr<OFstream> forceFilePtr_;
+
+            //- Moments
+            autoPtr<OFstream> momentFilePtr_;
+
+            //- Force bins
+            autoPtr<OFstream> forceBinFilePtr_;
+
+            //- Moment bins
+            autoPtr<OFstream> momentBinFilePtr_;
+
+            //- Local force
+            autoPtr<OFstream> localForceFilePtr_;
+
+            //- Local moment
+            autoPtr<OFstream> localMomentFilePtr_;
+
+            //- Local force bins
+            autoPtr<OFstream> localForceBinFilePtr_;
+
+            //- Local moment bins
+            autoPtr<OFstream> localMomentBinFilePtr_;
+
 
         // Read from dictionary
 
@@ -223,21 +264,36 @@ protected:
                 bool binCumulative_;
 
 
+            //- Write fields flag
+            bool writeFields_;
+
             //- Initialised flag
             bool initialised_;
 
 
     // Protected Member Functions
 
-        //- Create file names for forces and bins
-        wordList createFileNames(const dictionary& dict) const;
+        //- Create a field name
+        word fieldName(const word& name) const;
+
+        //- Create the output files
+        void createFiles();
 
-        //- Output file header information
-        virtual void writeFileHeader(const label i);
+        //- Write header for integrated data
+        void writeIntegratedHeader(const word& header, Ostream& os) const;
+
+        //- Write header for binned data
+        void writeBinHeader(const word& header, Ostream& os) const;
 
         //- Initialise the fields
         void initialise();
 
+        //- Initialise the collection bins
+        void initialiseBins();
+
+        //- Reset the fields prior to accumulation of force/moments
+        void resetFields();
+
         //- Return the effective viscous stress (laminar + turbulent).
         tmp<volSymmTensorField> devRhoReff() const;
 
@@ -261,10 +317,47 @@ protected:
             const vectorField& d
         );
 
-        //- Helper function to write force data
+        //- Add patch contributions to force and moment fields
+        void addToFields
+        (
+            const label patchI,
+            const vectorField& Md,
+            const vectorField& fN,
+            const vectorField& fT,
+            const vectorField& fP
+        );
+
+        //- Add cell contributions to force and moment fields
+        void addToFields
+        (
+            const labelList& cellIDs,
+            const vectorField& Md,
+            const vectorField& fN,
+            const vectorField& fT,
+            const vectorField& fP
+        );
+
+        //- Helper function to write integrated forces and moments
+        void writeIntegratedForceMoment
+        (
+            const string& descriptor,
+            const vectorField& fm0,
+            const vectorField& fm1,
+            const vectorField& fm2,
+            autoPtr<OFstream>& osPtr
+        ) const;
+
+        //- Write force data
         void writeForces();
 
-        //- Helper function to write bin data
+        //- Helper function to write binned forces and moments
+        void writeBinnedForceMoment
+        (
+            const List<Field<vector> >& fm,
+            autoPtr<OFstream>& osPtr
+        ) const;
+
+        //- Write binned data
         void writeBins();
 
         //- Disallow default bitwise copy construct