diff --git a/src/finiteVolume/cfdTools/general/porousMedia/porousZone.C b/src/finiteVolume/cfdTools/general/porousMedia/porousZone.C
index bca5179990..50d0c99f83 100644
--- a/src/finiteVolume/cfdTools/general/porousMedia/porousZone.C
+++ b/src/finiteVolume/cfdTools/general/porousMedia/porousZone.C
@@ -73,6 +73,8 @@ Foam::porousZone::porousZone
     cellZoneID_(mesh_.cellZones().findZoneID(name)),
     coordSys_(dict, mesh),
     porosity_(1),
+    intensity_(1e-2),
+    mixingLength_(1e-3),
     C0_(0),
     C1_(0),
     D_("D", dimensionSet(0, -2, 0, 0, 0), tensor::zero),
@@ -95,21 +97,57 @@ Foam::porousZone::porousZone
 
 
     // porosity
-    if (dict_.readIfPresent("porosity", porosity_))
+    if
+    (
+        dict_.readIfPresent("porosity", porosity_)
+     && (porosity_ <= 0.0 || porosity_ > 1.0)
+    )
     {
-        if (porosity_ <= 0.0 || porosity_ > 1.0)
-        {
-            FatalIOErrorIn
-            (
-                "Foam::porousZone::porousZone"
-                "(const fvMesh&, const word&, const dictionary&)",
-                dict_
-            )
-                << "out-of-range porosity value " << porosity_
-                << exit(FatalIOError);
-        }
+        FatalIOErrorIn
+        (
+            "Foam::porousZone::porousZone"
+            "(const fvMesh&, const word&, const dictionary&)",
+            dict_
+        )
+            << "out-of-range porosity value " << porosity_
+            << exit(FatalIOError);
     }
 
+    // turbulent intensity
+    if
+    (
+        dict_.readIfPresent("intensity", intensity_)
+     && (intensity_ <= 0.0 || intensity_ > 1.0)
+    )
+    {
+        FatalIOErrorIn
+        (
+            "Foam::porousZone::porousZone"
+            "(const fvMesh&, const word&, const dictionary&)",
+            dict_
+        )
+            << "out-of-range turbulent intensity value " << intensity_
+            << exit(FatalIOError);
+    }
+
+    // turbulent length scale
+    if
+    (
+        dict_.readIfPresent("mixingLength", mixingLength_)
+     && (mixingLength_ <= 0.0)
+    )
+    {
+        FatalIOErrorIn
+        (
+            "Foam::porousZone::porousZone"
+            "(const fvMesh&, const word&, const dictionary&)",
+            dict_
+        )
+            << "out-of-range turbulent length scale " << mixingLength_
+            << exit(FatalIOError);
+    }
+
+
     // powerLaw coefficients
     if (const dictionary* dictPtr = dict_.subDictPtr("powerLaw"))
     {
@@ -171,9 +209,6 @@ Foam::porousZone::porousZone
         }
     }
 
-    // provide some feedback for the user
-    // writeDict(Info, false);
-
     // it is an error not to define anything
     if
     (
@@ -191,6 +226,12 @@ Foam::porousZone::porousZone
                "nor Darcy-Forchheimer law (d/f) specified"
             << exit(FatalIOError);
     }
+
+    // feedback for the user
+    if (dict.lookupOrDefault("printCoeffs", false))
+    {
+        writeDict(Info, false);
+    }
 }
 
 
@@ -365,7 +406,8 @@ void Foam::porousZone::writeDict(Ostream& os, bool subDict) const
     if (subDict)
     {
         os  << indent << token::BEGIN_BLOCK << incrIndent << nl;
-        os.writeKeyword("name") << zoneName() << token::END_STATEMENT << nl;
+        os.writeKeyword("name")
+            << zoneName() << token::END_STATEMENT << nl;
     }
     else
     {
@@ -375,40 +417,53 @@ void Foam::porousZone::writeDict(Ostream& os, bool subDict) const
 
     if (dict_.found("note"))
     {
-        os.writeKeyword("note") << string(dict_.lookup("note"))
-            << token::END_STATEMENT << nl;
+        os.writeKeyword("note")
+            << string(dict_.lookup("note")) << token::END_STATEMENT << nl;
     }
 
     coordSys_.writeDict(os, true);
 
     if (dict_.found("porosity"))
     {
-        os.writeKeyword("porosity") << porosity() << token::END_STATEMENT << nl;
+        os.writeKeyword("porosity")
+            << porosity() << token::END_STATEMENT << nl;
+    }
+
+    if (dict_.found("intensity"))
+    {
+        os.writeKeyword("intensity")
+            << intensity() << token::END_STATEMENT << nl;
+    }
+
+    if (dict_.found("mixingLength"))
+    {
+        os.writeKeyword("mixingLength")
+            << mixingLength() << token::END_STATEMENT << nl;
     }
 
     // powerLaw coefficients
     if (const dictionary* dictPtr = dict_.subDictPtr("powerLaw"))
     {
-        os << indent << "powerLaw";
+        os  << indent << "powerLaw";
         dictPtr->write(os);
     }
 
     // Darcy-Forchheimer coefficients
     if (const dictionary* dictPtr = dict_.subDictPtr("Darcy"))
     {
-        os << indent << "Darcy";
+        os  << indent << "Darcy";
         dictPtr->write(os);
     }
 
-    os << decrIndent << indent << token::END_BLOCK << endl;
+    os  << decrIndent << indent << token::END_BLOCK << endl;
 }
 
 
 // * * * * * * * * * * * * * * * IOstream Operators  * * * * * * * * * * * * //
 
-Foam::Ostream& Foam::operator<<(Ostream& os, const porousZone& pZone)
+Foam::Ostream& Foam::operator<<(Ostream& os, const porousZone& pz)
 {
-    pZone.writeDict(os);
+    pz.writeDict(os);
     return os;
 }
 
diff --git a/src/finiteVolume/cfdTools/general/porousMedia/porousZone.H b/src/finiteVolume/cfdTools/general/porousMedia/porousZone.H
index 3054df0328..4105902bac 100644
--- a/src/finiteVolume/cfdTools/general/porousMedia/porousZone.H
+++ b/src/finiteVolume/cfdTools/general/porousMedia/porousZone.H
@@ -51,6 +51,25 @@ Description
     The porousZones method porousZones::ddt() mirrors the normal fvm::ddt()
     method, but accounts for the effective volume of the cells.
 
+    An example dictionary entry:
+    @verbatim
+    cat1
+    {
+        note            "some catalyst";
+        coordinateSystem    system_10;
+        porosity        0.809;
+        intensity       0.001;      // optional: default 1% turbulence
+        mixingLength    0.0001;     // optional: default 1mm mixingLength
+        printCoeffs     yes;        // optional: feedback for the user
+
+        Darcy
+        {
+            d   d [0 -2 0 0 0]  (-1000 -1000 5.3756e+07);
+            f   f [0 -1 0 0 0]  (-1000 -1000 15.83);
+        }
+    }
+    @endverbatim
+
 See Also
     porousZones and coordinateSystems
 
@@ -111,6 +130,12 @@ class porousZone
         //  Currently unused.
         scalar porosity_;
 
+        //- Turbulent intensity as fraction of the velocity (default: 0.01)
+        scalar intensity_;
+
+        //- Turbulent length scale (default: 0.001)
+        scalar mixingLength_;
+
         //- powerLaw coefficient C0
         scalar C0_;
 
@@ -283,6 +308,30 @@ public:
                 return porosity_;
             }
 
+            //- Return turbulent intensity
+            scalar intensity() const
+            {
+                return intensity_;
+            }
+
+            //- Edit access to turbulent intensity
+            scalar& intensity()
+            {
+                return intensity_;
+            }
+
+            //- Return turbulent length scale
+            scalar mixingLength() const
+            {
+                return mixingLength_;
+            }
+
+            //- Edit access to turbulent length scale
+            scalar& mixingLength()
+            {
+                return mixingLength_;
+            }
+
 
         //- Modify time derivative elements according to porosity
         template<class Type>