diff --git a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/ErgunWenYuDrag/ErgunWenYuDragForce.C b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/ErgunWenYuDrag/ErgunWenYuDragForce.C
index ae26d505..a18ffbec 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/ErgunWenYuDrag/ErgunWenYuDragForce.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/ErgunWenYuDrag/ErgunWenYuDragForce.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2013 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2013-2014 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -110,7 +110,7 @@ Foam::forceSuSp Foam::ErgunWenYuDragForce<CloudType>::calcCoupled
         (
             vector::zero,
             (mass/p.rho())
-           *(150.0*(1.0 - alphac) + 1.75*Re)*muc/(alphac*sqr(p.d()))
+           *(150.0*(1.0 - alphac)/alphac + 1.75*Re)*muc/(alphac*sqr(p.d()))
         );
     }
     else
@@ -119,7 +119,7 @@ Foam::forceSuSp Foam::ErgunWenYuDragForce<CloudType>::calcCoupled
         (
             vector::zero,
             (mass/p.rho())
-           *0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/sqr(p.d())
+           *0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/(alphac*sqr(p.d()))
         );
     }
 }
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/PlessisMasliyahDrag/PlessisMasliyahDragForce.C b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/PlessisMasliyahDrag/PlessisMasliyahDragForce.C
index 1b7dee57..970dee90 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/PlessisMasliyahDrag/PlessisMasliyahDragForce.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/PlessisMasliyahDrag/PlessisMasliyahDragForce.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2013 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2013-2014 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -123,7 +123,7 @@ Foam::forceSuSp Foam::PlessisMasliyahDragForce<CloudType>::calcCoupled
     (
         vector::zero,
         (mass/p.rho())
-       *(A*(1.0 - alphac) + B*Re)*muc/(alphac*sqr(p.d()))
+       *(A*(1.0 - alphac)/alphac + B*Re)*muc/(alphac*sqr(p.d()))
     );
 }
 
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/WenYuDrag/WenYuDragForce.C b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/WenYuDrag/WenYuDragForce.C
index 415bd06b..57356aa1 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/WenYuDrag/WenYuDragForce.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/WenYuDrag/WenYuDragForce.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2013 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2013-2014 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -105,7 +105,7 @@ Foam::forceSuSp Foam::WenYuDragForce<CloudType>::calcCoupled
     (
         vector::zero,
         (mass/p.rho())
-       *0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/sqr(p.d())
+       *0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/(alphac*sqr(p.d()))
     );
 }
 
diff --git a/tutorials/lagrangian/MPPICFoam/cyclone/constant/kinematicCloudProperties b/tutorials/lagrangian/MPPICFoam/cyclone/constant/kinematicCloudProperties
index c0341ddd..d87d0dbf 100644
--- a/tutorials/lagrangian/MPPICFoam/cyclone/constant/kinematicCloudProperties
+++ b/tutorials/lagrangian/MPPICFoam/cyclone/constant/kinematicCloudProperties
@@ -20,7 +20,7 @@ solution
     active          true;
     coupled         true;
     transient       yes;
-    cellValueSourceCorrection on;
+    cellValueSourceCorrection off;
 
     maxCo           1.0;