diff --git a/src/recurrence/Make/files b/src/recurrence/Make/files
index e832cfb5..31c09b23 100644
--- a/src/recurrence/Make/files
+++ b/src/recurrence/Make/files
@@ -2,7 +2,6 @@ recBase/recBase.C
 recModel/recModel/recModel.C
 recModel/recModel/newRecModel.C
 recModel/standardRecModel/standardRecModel.C
-recModel/gerhardsRecModel/gerhardsRecModel.C
 recNorm/recNorm/recNorm.C
 recNorm/recNorm/newRecNorm.C
 recNorm/diffNorm/diffNorm.C
@@ -23,5 +22,6 @@ recStatAnalysis/recStatAnalysis/recStatAnalysis.C
 recStatAnalysis/recStatAnalysis/newRecStatAnalysis.C
 recStatAnalysis/noRecStatAnalysis/noRecStatAnalysis.C
 recStatAnalysis/standardRecStatAnalysis/standardRecStatAnalysis.C
+recStatAnalysis/autocorrelation/autocorrelation.C
 
 LIB = $(CFDEM_LIB_DIR)/librecurrence
diff --git a/src/recurrence/recModel/recModel/recModel.H b/src/recurrence/recModel/recModel/recModel.H
index df2800b6..95f63797 100644
--- a/src/recurrence/recModel/recModel/recModel.H
+++ b/src/recurrence/recModel/recModel/recModel.H
@@ -135,11 +135,7 @@ public:
 
     /*virtual void exportVolScalarField(word, volScalarField&) const = 0;
     virtual void exportVolVectorField(word, volVectorField&) const = 0;
-    virtual void exportSurfaceScalarField(word, surfaceScalarField&) const = 0;
-
-    virtual const volScalarField& exportVolScalarField(word, label) const = 0;
-    virtual const volVectorField& exportVolVectorField(word, label) const = 0;
-    virtual const surfaceScalarField& exportSurfaceScalarField(word, label) const = 0;*/
+    virtual void exportSurfaceScalarField(word, surfaceScalarField&) const = 0;*/
 
     virtual void exportVolScalarFieldAve(word, volScalarField&, label = 0)
     {}
@@ -148,6 +144,14 @@ public:
     virtual void exportSurfaceScalarFieldAve(word, surfaceScalarField&, label = 0)
     {}
 
+    virtual tmp<volScalarField> exportVolScalarFieldAve(word, label = 0)
+    {
+        return volScalarField::null();
+    }
+    virtual tmp<volVectorField> exportVolVectorFieldAve(word, label = 0)
+    {
+        return volVectorField::null();
+    }
     virtual tmp<surfaceScalarField> exportSurfaceScalarFieldAve(word, label = 0)
     {
         return surfaceScalarField::null();
@@ -161,6 +165,10 @@ public:
     virtual const volVectorField& exportVolVectorField(word, label)  = 0;
     virtual const surfaceScalarField& exportSurfaceScalarField(word, label)  = 0;
 
+    virtual PtrList<volScalarField>& exportVolScalarFieldList(word)  = 0;
+    virtual PtrList<volVectorField>& exportVolVectorFieldList(word)  = 0;
+    virtual PtrList<surfaceScalarField>& exportSurfaceScalarFieldList(word)  = 0;
+
   //  virtual tmp<surfaceScalarField> exportAveragedSurfaceScalarField(word, scalar, label index = -1) = 0;
     virtual void exportAveragedVolVectorField(volVectorField&, word, scalar, label index = -1) const = 0;
 
diff --git a/src/recurrence/recModel/standardRecModel/standardRecModel.C b/src/recurrence/recModel/standardRecModel/standardRecModel.C
index e87f99d4..e6e9fdc7 100644
--- a/src/recurrence/recModel/standardRecModel/standardRecModel.C
+++ b/src/recurrence/recModel/standardRecModel/standardRecModel.C
@@ -550,6 +550,34 @@ void standardRecModel::exportSurfaceScalarFieldAve(word fieldname, surfaceScalar
     field = aveSurfaceScalarFieldList_[fieldI][db];
 }
 
+tmp<volScalarField> standardRecModel::exportVolScalarFieldAve(word fieldname, label db)
+{
+    if(!storeAveragedFields_)
+    {
+        FatalError <<"no averaged fields available, need to activate \"storeAveragedFields\"\n" << abort(FatalError);
+    }
+    if (db >= numDataBases_)
+    {
+        FatalError <<"can't find database with number " << db << abort(FatalError);
+    }
+    const label fieldI = getVolScalarFieldIndex(fieldname, 0);
+    return aveVolScalarFieldList_[fieldI][db];
+}
+
+tmp<volVectorField> standardRecModel::exportVolVectorFieldAve(word fieldname, label db)
+{
+    if(!storeAveragedFields_)
+    {
+        FatalError <<"no averaged fields available, need to activate \"storeAveragedFields\"\n" << abort(FatalError);
+    }
+    if (db >= numDataBases_)
+    {
+        FatalError <<"can't find database with number " << db << abort(FatalError);
+    }
+    const label fieldI = getVolVectorFieldIndex(fieldname, 0);
+    return aveVolVectorFieldList_[fieldI][db];
+}
+
 tmp<surfaceScalarField> standardRecModel::exportSurfaceScalarFieldAve(word fieldname, label db)
 {
     if(!storeAveragedFields_)
@@ -603,6 +631,27 @@ const surfaceScalarField& standardRecModel::exportSurfaceScalarField(word fieldn
     return surfaceScalarFieldList_[fieldI][index];
 }
 
+PtrList<volScalarField>& standardRecModel::exportVolScalarFieldList(word fieldname)
+{
+    const label fieldI = getVolScalarFieldIndex(fieldname);
+
+    return volScalarFieldList_[fieldI];
+}
+
+PtrList<volVectorField>& standardRecModel::exportVolVectorFieldList(word fieldname)
+{
+    const label fieldI = getVolVectorFieldIndex(fieldname);
+
+    return volVectorFieldList_[fieldI];
+}
+
+PtrList<surfaceScalarField>& standardRecModel::exportSurfaceScalarFieldList(word fieldname)
+{
+    const label fieldI = getSurfaceScalarFieldIndex(fieldname);
+
+    return surfaceScalarFieldList_[fieldI];
+}
+
 
 SymmetricSquareMatrix<scalar>& standardRecModel::recurrenceMatrix()
 {
diff --git a/src/recurrence/recModel/standardRecModel/standardRecModel.H b/src/recurrence/recModel/standardRecModel/standardRecModel.H
index e7959bef..19adc5a7 100644
--- a/src/recurrence/recModel/standardRecModel/standardRecModel.H
+++ b/src/recurrence/recModel/standardRecModel/standardRecModel.H
@@ -84,9 +84,9 @@ protected:
     
     scalar checkTimeStep();
     
-    inline label getVolScalarFieldIndex(word, label) const;
-    inline label getVolVectorFieldIndex(word, label) const;
-    inline label getSurfaceScalarFieldIndex(word, label) const;
+    inline label getVolScalarFieldIndex(word, label = 0) const;
+    inline label getVolVectorFieldIndex(word, label = 0) const;
+    inline label getSurfaceScalarFieldIndex(word, label = 0) const;
 
     void init();
 
@@ -119,6 +119,8 @@ public:
     void exportVolVectorFieldAve(word, volVectorField&, label);
     void exportSurfaceScalarFieldAve(word, surfaceScalarField&, label);
     
+    tmp<volScalarField> exportVolScalarFieldAve(word, label = 0);
+    tmp<volVectorField> exportVolVectorFieldAve(word, label = 0);
     tmp<surfaceScalarField> exportSurfaceScalarFieldAve(word, label = 0);
 
     void exportVolScalarField(word, volScalarField&);
@@ -128,6 +130,10 @@ public:
     const volScalarField& exportVolScalarField(word, label);
     const volVectorField& exportVolVectorField(word, label);
     const surfaceScalarField& exportSurfaceScalarField(word, label);
+
+    PtrList<volScalarField>& exportVolScalarFieldList(word);
+    PtrList<volVectorField>& exportVolVectorFieldList(word);
+    PtrList<surfaceScalarField>& exportSurfaceScalarFieldList(word);
     
   //  tmp<surfaceScalarField> exportAveragedSurfaceScalarField(word, scalar, label index = -1);
     void exportAveragedVolVectorField(volVectorField&, word, scalar, label index = -1) const;
diff --git a/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.C b/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.C
new file mode 100644
index 00000000..0da4e408
--- /dev/null
+++ b/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.C
@@ -0,0 +1,179 @@
+/*---------------------------------------------------------------------------*\
+    CFDEMcoupling academic - Open Source CFD-DEM coupling
+
+    Contributing authors:
+    Thomas Lichtenegger, Gerhard Holzinger
+    Copyright (C) 2015- Johannes Kepler University, Linz
+-------------------------------------------------------------------------------
+License
+    This file is part of CFDEMcoupling academic.
+
+    CFDEMcoupling academic 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.
+
+    CFDEMcoupling academic 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 CFDEMcoupling academic.  If not, see <http://www.gnu.org/licenses/>.
+\*---------------------------------------------------------------------------*/
+
+#include "error.H"
+#include "Random.H"
+#include "autocorrelation.H"
+#include "recModel.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+defineTypeNameAndDebug(autocorrelation, 0);
+
+addToRunTimeSelectionTable
+(
+    recStatAnalysis,
+    autocorrelation,
+    dictionary
+);
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+// Construct from components
+autocorrelation::autocorrelation
+(
+    const dictionary& dict,
+    recBase& base
+)
+:
+    recStatAnalysis(dict,base),
+    propsDict_(dict.subDict(typeName + "Props")),
+    fieldname_(propsDict_.lookup("fieldname")),
+    fieldtype_(propsDict_.lookup("fieldtype")),
+    delaySteps_(propsDict_.lookupOrDefault<label>("delaysteps",0)),
+    refCell_(0),
+    refPoint_(propsDict_.lookup("refPoint")),
+    normalize_(propsDict_.lookupOrDefault<bool>("normalize",true)),
+    autoCorrField_
+    (   IOobject
+        (
+            "autoCorrField",
+            base.mesh().time().timeName(),
+            base.mesh(),
+            IOobject::NO_READ,
+            IOobject::NO_WRITE
+        ),
+        base.mesh(),
+        dimensionedScalar("zero", dimensionSet(0,0,0,0,0), 0.0)
+    )
+{
+    if (fieldtype_ != "scalar" && fieldtype_ != "vector")
+    {
+        FatalError <<"fieldtype needs to be either scalar or vector.\n" << abort(FatalError);
+    }
+
+    scalar delayTime = delaySteps_ * base.recM().recTimeStep();
+    autoCorrField_.rename("autoCorrField"+name(delayTime));
+
+    refCell_ = base.mesh().findCell(refPoint_);
+}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+autocorrelation::~autocorrelation()
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+void autocorrelation::init()
+{
+
+}
+
+void autocorrelation::statistics()
+{
+    autocorr();
+}
+
+
+
+void autocorrelation::autocorr()
+{
+    scalar res = 0.0;
+    PtrList<volScalarField> scalarFieldList;
+    PtrList<volVectorField> vectorFieldList;
+    if (fieldtype_ == "scalar") scalarFieldList.transfer(base_.recM().exportVolScalarFieldList(fieldname_));
+    else vectorFieldList.transfer(base_.recM().exportVolVectorFieldList(fieldname_));
+
+    label tmax = base_.recM().totRecSteps();
+    for (label ti = delaySteps_; ti < tmax; ti++)
+    {
+        forAll(autoCorrField_, cellI)
+        {
+            if (fieldtype_ == "scalar") 
+            {
+                res = scalarFieldList[ti-delaySteps_][refCell_] * scalarFieldList[ti][cellI];
+            }
+            else
+            {
+                res = vectorFieldList[ti-delaySteps_][refCell_] & vectorFieldList[ti][cellI];
+            }
+            autoCorrField_[cellI] += res;
+        }
+    }
+
+    autoCorrField_ /= (tmax - delaySteps_);
+
+    if (normalize_)
+    {
+        volScalarField meanProd(autoCorrField_);
+        if (fieldtype_ == "scalar")
+        {
+            volScalarField aveField = base_.recM().exportVolScalarFieldAve(fieldname_);
+            forAll(meanProd, cellI)
+            {
+                meanProd[cellI] = aveField()[cellI] * aveField()[refCell_];
+            }
+        }
+        else
+        {
+            volVectorField aveField = base_.recM().exportVolVectorFieldAve(fieldname_);
+            forAll(meanProd, cellI)
+            {
+                meanProd[cellI] = aveField()[cellI] & aveField()[refCell_];
+            }
+        }
+        autoCorrField_ /= meanProd;
+    }
+    else
+    {
+        dimensionSet fieldDim(0,0,0,0,0);
+        if (fieldtype_ == "scalar")
+        {
+            fieldDim.reset(scalarFieldList[0].dimensions());
+        }
+        else
+        {
+            fieldDim.reset(vectorFieldList[0].dimensions());
+        }
+
+        fieldDim = fieldDim * fieldDim;
+
+        autoCorrField_.dimensions().reset(fieldDim);
+    }
+}
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// ************************************************************************* //
diff --git a/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.H b/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.H
new file mode 100644
index 00000000..ae08ad51
--- /dev/null
+++ b/src/recurrence/recStatAnalysis/autocorrelation/autocorrelation.H
@@ -0,0 +1,102 @@
+/*---------------------------------------------------------------------------*\
+    CFDEMcoupling academic - Open Source CFD-DEM coupling
+
+    Contributing authors:
+    Thomas Lichtenegger, Gerhard Holzinger
+    Copyright (C) 2015- Johannes Kepler University, Linz
+-------------------------------------------------------------------------------
+License
+    This file is part of CFDEMcoupling academic.
+
+    CFDEMcoupling academic 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.
+
+    CFDEMcoupling academic 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 CFDEMcoupling academic.  If not, see <http://www.gnu.org/licenses/>.
+\*---------------------------------------------------------------------------*/
+
+#ifndef autocorrelation_H
+#define autocorrelation_H
+
+#include "recStatAnalysis.H"
+#include "scalarList.H"
+#include "fvCFD.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                           Class autocorrelation Declaration
+\*---------------------------------------------------------------------------*/
+
+class autocorrelation
+:
+    public recStatAnalysis
+{
+protected:
+
+
+public:
+
+    //- Runtime type information
+    TypeName("autocorrelation");
+
+
+    // Constructors
+
+        //- Construct from components
+        autocorrelation
+        (
+            const dictionary& dict,
+            recBase& base
+        );
+
+    // Destructor
+
+        ~autocorrelation();
+
+    void init();
+
+    void statistics();
+
+
+private:
+
+    dictionary propsDict_;
+
+    word fieldname_;
+
+    word fieldtype_;
+
+    label delaySteps_;
+
+    label refCell_;
+
+    vector refPoint_;
+
+    bool normalize_;
+
+    volScalarField autoCorrField_;
+
+    void autocorr();
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //