diff --git a/dune/mmdg/mmdg.hh b/dune/mmdg/mmdg.hh
index e575f73dc56e855ac29dbf67a89a2596e2c9f4c9..e881d5e45fce9c20c5f45b69dccb2b95fabc3e67 100644
--- a/dune/mmdg/mmdg.hh
+++ b/dune/mmdg/mmdg.hh
@@ -36,18 +36,8 @@ public:
     assembleSLE(mu, xi);
     //Base::A->compress();
 
-    for (int i = 0; i < Base::dof_; i++)
-      for (int j = 0; j < i; j++)
-        /*assert*/if(std::abs((*Base::A)[i][j] - (*Base::A)[j][i]) >
-          std::numeric_limits<Scalar>::epsilon())
-            std::cout << "NON-symmetric!: " << i << ", " << j << std::endl;
-
-    std::cout << *Base::A << std::endl;
-
     (*Base::A).solve(Base::d, Base::b);
 
-    std::cout << "\n\n" << Base::b << "\n\n" << Base::d << "\n\n";
-
     // Dune::InverseOperatorResult result;
     // Dune::UMFPack<Matrix> solver(*Base::A);
     // solver.apply(Base::d, Base::b, result);
@@ -98,7 +88,9 @@ public:
       }
     }
 
-    std::cout << "ERROR bulk: " << bulkError << "\t ERROR interface: " << sqrt(interfaceError) << "\n";
+    //print bulk and interface error
+    std::cout << "ERROR bulk: " << bulkError << "\t ERROR interface: " <<
+      sqrt(interfaceError) << "\n";
 
     return sqrt(bulkError * bulkError + interfaceError);
   }
@@ -113,7 +105,7 @@ private:
     //modell parameter
     const auto beta = [this, &xi](const Coordinate& pos) -> Scalar
     {
-      return 4 * Base::problem_.Kperp(pos) / (2 * xi - 1);
+      return 4.0 * Base::problem_.Kperp(pos) / (2.0 * xi - 1.0);
     };
 
     //quadrature rules
@@ -158,12 +150,6 @@ private:
       const auto& iGeo = iElem.geometry();
       const auto& intersct = Base::gridView_.grid().asIntersection(iElem);
 
-      if ( Base::mapper_.index(intersct.inside())
-        > Base::mapper_.index(intersct.outside()) )
-      {
-        std::cout << "INDEX ERROR!\n\n";
-      }
-
       //get basis of the interface coordinate system for evaluation of
       //basis function phi_iElem,i with i=1,...,dim-1
       const InterfaceBasis iFrame =
@@ -189,8 +175,7 @@ private:
           ip.weight() * iGeo.integrationElement(qpLocal);
         const Scalar betaEvaluation = beta(qpGlobal);
 
-        (*Base::A)[iElemIdxSLE][iElemIdxSLE] +=
-          quadratureFactor * betaEvaluation;
+        (*Base::A)[iElemIdxSLE][iElemIdxSLE] += quadratureFactor * betaEvaluation;
 
         for (int i = 0; i < dim - 1; i++)
         {
@@ -400,7 +385,7 @@ private:
       //and for elem in {elemIn, elemOut} using a quadrature rule
       for (const auto& ip : rule_KperpPlus1) //TODO: symmetrize more efficiently
       //TODO: apply quadrature rule only once
-      { //TODO TODO TODO
+      {
         const auto& qpLocal = ip.position();
         const auto& qpGlobal = iGeo.global(qpLocal);
 
@@ -645,7 +630,7 @@ private:
               dEvaluation2 * (interfaceUpdate1 - interfaceUpdate2);
 
             Base::b[iElemIdxSLE + i + 1] +=
-              d2gGamma * (mu * centerI - interfaceUpdate2);
+              d2gGamma * (interfaceUpdate1 - interfaceUpdate2);
 
             (*Base::A)[iElemIdxSLE + i + 1][iElemIdxSLE] +=
               interfaceUpdate3;
diff --git a/dune/mmdg/problems/coupleddgproblem.hh b/dune/mmdg/problems/coupleddgproblem.hh
index 72b1f03eb86a6ec4d24d93d2e7e2bf476261f818..10488bfe8d4bcc572f9260dde50ecab2282512ca 100644
--- a/dune/mmdg/problems/coupleddgproblem.hh
+++ b/dune/mmdg/problems/coupleddgproblem.hh
@@ -9,81 +9,81 @@
 template<class Coordinate, class Scalar = double>
 class CoupledDGProblem : public DGProblem<Coordinate, Scalar>
 {
-  public:
-    static constexpr int dim = Coordinate::dimension;
-    using Base = DGProblem<Coordinate, Scalar>;
-    using Matrix = typename Base::Matrix;
+public:
+  static constexpr int dim = Coordinate::dimension;
+  using Base = DGProblem<Coordinate, Scalar>;
+  using Matrix = typename Base::Matrix;
 
-    //the exact solution on the interface at position pos
-    virtual Scalar exactInterfaceSolution (const Coordinate& pos) const
-    {
-      return Scalar(0.0);
-    }
+  //the exact solution on the interface at position pos
+  virtual Scalar exactInterfaceSolution (const Coordinate& pos) const
+  {
+    return Scalar(0.0);
+  }
 
-    //interface source term at position pos
-    virtual Scalar qInterface (const Coordinate& pos) const
-    {
-      return Scalar(0.0);
-    }
+  //interface source term at position pos
+  virtual Scalar qInterface (const Coordinate& pos) const
+  {
+    return Scalar(0.0);
+  }
 
-    //aperture d of the fracture at position pos
-    virtual Scalar aperture (const Coordinate& pos) const
-    {
-      return Scalar(1.0);
-    }
+  //aperture d of the fracture at position pos
+  virtual Scalar aperture (const Coordinate& pos) const
+  {
+    return Scalar(1.0);
+  }
 
-    virtual Scalar interfaceBoundary(const Coordinate& pos) const
-    {
-      return exactInterfaceSolution(pos);
-    }
+  virtual Scalar interfaceBoundary(const Coordinate& pos) const
+  {
+    return exactInterfaceSolution(pos);
+  }
 
-    //tangential permeability tensor of the interface at position pos
-    virtual Matrix Kparallel (const Coordinate& pos) const
-    {
-      Matrix permeability(0.0);
+  //tangential permeability per aperture tensor of the interface at position pos
+  virtual Matrix Kparallel (const Coordinate& pos) const
+  {
+    Matrix permeability(0.0);
 
-      for (int i = 0; i < dim; i++)
-      {
-        permeability[i][i] = 1.0;
-      }
-
-      //return identity matrix
-      return permeability;
-    }
-
-    //permeability of the fracture in normal direction at position pos
-    virtual Scalar Kperp (const Coordinate& pos) const
+    for (int i = 0; i < dim; i++)
     {
-      return Scalar(1.0);
+      permeability[i][i] = 1.0;
     }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * qInterface(x)
-    virtual int quadratureOrder_qInterface () const
-    {
-      return 1;
-    }
+    //return identity matrix
+    return permeability;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * interfaceBoundary(x)
-    virtual int quadratureOrderInterfaceBoundary () const
-    { //NOTE: only relevant for 3d, not implemented!
-      return 1;
-    }
+  //permeability per aperture of the fracture in normal direction at position pos
+  virtual Scalar Kperp (const Coordinate& pos) const
+  {
+    return Scalar(1.0);
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over Kparallel(x)
-    virtual int quadratureOrder_Kparallel () const
-    {
-      return 1;
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * qInterface(x)
+  virtual int quadratureOrder_qInterface () const
+  {
+    return 1;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * Kperp(x) / d(x)
-    virtual int quadratureOrder_Kperp () const
-    {
-      return 1;
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * interfaceBoundary(x)
+  virtual int quadratureOrderInterfaceBoundary () const
+  { //NOTE: only relevant for 3d, not implemented!
+    return 1;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over Kparallel(x)
+  virtual int quadratureOrder_Kparallel () const
+  {
+    return 1;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * Kperp(x) / d(x)
+  virtual int quadratureOrder_Kperp () const
+  {
+    return 1;
+  }
 };
 
 #endif
diff --git a/dune/mmdg/problems/mmdgproblem1.hh b/dune/mmdg/problems/mmdgproblem1.hh
index c2008c84a30afc7d4f1f2ece79b7ba61f3bbd676..c5efe4ba3d24aaa5107fb1e43dad3d1cce499197 100644
--- a/dune/mmdg/problems/mmdgproblem1.hh
+++ b/dune/mmdg/problems/mmdgproblem1.hh
@@ -4,58 +4,87 @@
 #include <cmath>
 #include <dune/mmdg/problems/coupleddgproblem.hh>
 
-//a coupled dg problem for dim = 2,
-//taken from [Antonietti et al. (2019): Example 6.3]
+//a coupled dg problem
 template<class Coordinate, class Scalar = double>
 class MMDGProblem1 : public CoupledDGProblem<Coordinate, Scalar>
 {
-  public:
-    static constexpr int dim = Coordinate::dimension;
+public:
+  static constexpr int dim = Coordinate::dimension;
+  using Base = CoupledDGProblem<Coordinate, Scalar>;
+  using Matrix = typename Base::Matrix;
 
-    //the exact bulk solution at position pos
-    Scalar exactSolution (const Coordinate& pos) const
-    {
-      Scalar solution = pos * Coordinate(1.0);
-
-      if (pos[0] > 0.5)
-      {
-        solution += 1.0;
-      }
+  //constructor
+  MMDGProblem1 (const Scalar d) : d_(d) {}
 
-      return solution;
-    }
+  //the exact bulk solution at position pos
+  Scalar exactSolution (const Coordinate& pos) const
+  {
+    return (pos[0] < 0.5) ? pos[0] / (1.0 + d_) : (pos[0] - 1.0) / (1.0 + d_) + 1.0;
+    Scalar solution = pos * Coordinate(1.0);
 
-    //the exact solution on the interface at position pos
-    Scalar exactInterfaceSolution (const Coordinate& pos) const
+    if (pos[0] > 0.5)
     {
-      return pos * Coordinate(1.0) + 0.5;
+      solution += 1.0;
     }
 
-    //indicates whether an exact solution is implemented for the problem
-    bool hasExactSolution () const
-    {
-      return true;
-    };
+    return solution;
+  }
 
-    //aperture d of the fracture at position pos
-    Scalar aperture (const Coordinate& pos) const
-    {
-      return Scalar(1.0);
-    }
+  //the exact solution on the interface at position pos
+  Scalar exactInterfaceSolution (const Coordinate& pos) const
+  {
+    return 0.5;
+    return pos * Coordinate(1.0) + 0.5;
+  }
+
+  //indicates whether an exact solution is implemented for the problem
+  bool hasExactSolution () const
+  {
+    return true;
+  };
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * boundary(x)
-    int quadratureOrderBoundary () const
+  //aperture d of the fracture at position pos
+  Scalar aperture (const Coordinate& pos) const
+  {
+    return d_;
+  }
+
+  //tangential permeability tensor of the interface at position pos
+  Matrix Kparallel (const Coordinate& pos) const
+  {
+    Matrix permeability(0.0);
+
+    for (int i = 0; i < dim; i++)
     {
-      return 2;
+      permeability[i][i] = 1.0 / d_;
     }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * interfaceBoundary(x)
-    int quadratureOrderInterfaceBoundary () const
-    { //NOTE: only relevant for 3d, not implemented!
-      return 2;
-    }
+    //return identity matrix
+    return permeability;
+  }
+
+  //permeability of the fracture in normal direction at position pos
+  Scalar Kperp (const Coordinate& pos) const
+  {
+    return Scalar(1.0) / d_;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * boundary(x)
+  int quadratureOrderBoundary () const
+  {
+    return 2;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * interfaceBoundary(x)
+  int quadratureOrderInterfaceBoundary () const
+  { //NOTE: only relevant for 3d, not implemented!
+    return 2;
+  }
+
+private:
+  Scalar d_; //aperture
 };
 
 #endif
diff --git a/dune/mmdg/problems/mmdgproblem2.hh b/dune/mmdg/problems/mmdgproblem2.hh
index 24610882dbb644752546693d1324c263720d2ed0..624cefc18767a6b5e601c2ec1aeab5f0c88b26b6 100644
--- a/dune/mmdg/problems/mmdgproblem2.hh
+++ b/dune/mmdg/problems/mmdgproblem2.hh
@@ -9,97 +9,87 @@
 template<class Coordinate, class Scalar = double>
 class MMDGProblem2 : public CoupledDGProblem<Coordinate, Scalar>
 {
-  public:
-    static constexpr int dim = Coordinate::dimension;
-    using Base = CoupledDGProblem<Coordinate, Scalar>;
-    using Matrix = typename Base::Matrix;
+public:
+  static constexpr int dim = Coordinate::dimension;
+  using Base = CoupledDGProblem<Coordinate, Scalar>;
+  using Matrix = typename Base::Matrix;
 
-    //the exact bulk solution at position pos
-    Scalar exactSolution (const Coordinate& pos) const
-    {
-      Scalar solution =
-        (pos[0] < 0.5) ? std::sin(4 * pos[0]) : std::cos(4 * pos[0]);
-      return solution * std::cos(M_PI * pos[1]);
-    }
+  //the exact bulk solution at position pos
+  Scalar exactSolution (const Coordinate& pos) const
+  {
+    Scalar solution = (pos[0] < 0.5) ? std::sin(4 * pos[0]) : std::cos(4 * pos[0]);
+    return solution * std::cos(M_PI * pos[1]);
+  }
 
-    //the exact solution on the interface at position pos
-    Scalar exactInterfaceSolution (const Coordinate& pos) const
-    {
-      constexpr Scalar cos2 = std::cos(2.0);
-      constexpr Scalar sin2 = std::sin(2.0);
-      return 0.75 * (cos2 + sin2) * std::cos(M_PI * pos[1]);
-    }
+  //the exact solution on the interface at position pos
+  Scalar exactInterfaceSolution (const Coordinate& pos) const
+  {
+    constexpr Scalar sourcefactor = 0.75 * (std::cos(2.0) + std::sin(2.0));
+    return sourcefactor * std::cos(M_PI * pos[1]);
+  }
 
-    //indicates whether an exact solution is implemented for the problem
-    bool hasExactSolution () const
-    {
-      return true;
-    };
+  //indicates whether an exact solution is implemented for the problem
+  bool hasExactSolution () const
+  {
+    return true;
+  };
 
-    //bulk source term at position pos
-    Scalar q (const Coordinate& pos) const
-    {
-      constexpr Scalar sourcefactor = 16.0 + M_PI * M_PI;
-      Scalar source =
-        (pos[0] < 0.5) ? std::sin(4 * pos[0]) : std::cos(4 * pos[0]);
-      return sourcefactor * source * std::cos(M_PI * pos[1]);
-    }
+  //bulk source term at position pos
+  Scalar q (const Coordinate& pos) const
+  {
+    constexpr Scalar sourcefactor = 16.0 + M_PI * M_PI;
+    Scalar source = (pos[0] < 0.5) ? std::sin(4 * pos[0]) : std::cos(4 * pos[0]);
+    return sourcefactor * source * std::cos(M_PI * pos[1]);
+  }
 
-    //interface source term at position pos
-    Scalar qInterface (const Coordinate& pos) const
-    {
-      constexpr Scalar sourcefactor =
-        (std::cos(2.0) + std::sin(2.0)) * (4.0 + 0.1875 * M_PI * M_PI);
-      return sourcefactor * aperture(pos) * std::cos(M_PI * pos[1]);
-    }
+  //interface source term at position pos
+  Scalar qInterface (const Coordinate& pos) const
+  {
+    constexpr Scalar sourcefactor =
+      (std::cos(2.0) + std::sin(2.0)) * (4.0 + 3.0 / 64.0 * M_PI * M_PI);
+    return sourcefactor * std::cos(M_PI * pos[1]);
+  }
 
-    //aperture d of the fracture at position pos
-    Scalar aperture (const Coordinate& pos) const
-    {
-      return Scalar(0.25);
-    }
+  //aperture d of the fracture at position pos
+  Scalar aperture (const Coordinate& pos) const
+  {
+    return Scalar(0.25);
+  }
 
-    //tangential permeability tensor per aperture of the interface
-    //at position pos
-    Matrix Kparallel (const Coordinate& pos) const
-    {
-      return Base::Kparallel(pos) / aperture(pos);
-    }
+  //permeability per aperture  of the fracture per aperture in normal direction
+  //at position pos
+  Scalar Kperp (const Coordinate& pos) const
+  {
+    return Scalar(2.0);
+  }
 
-    //permeability of the fracture per aperture in normal direction
-    //at position pos
-    virtual Scalar Kperp (const Coordinate& pos) const
-    {
-      return Scalar(2.0);
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * q(x)
+  int quadratureOrder_q () const
+  {
+    return 10;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * q(x)
-    int quadratureOrder_q () const
-    {
-      return 10;
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * boundary(x)
+  int quadratureOrderBoundary () const
+  {
+    return 10;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * boundary(x)
-    int quadratureOrderBoundary () const
-    {
-      return 10;
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * interfaceBoundary(x)
+  int quadratureOrderInterfaceBoundary () const
+  { //NOTE: only relevant for 3d, not implemented!
+    return 10;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * interfaceBoundary(x)
-    int quadratureOrderInterfaceBoundary () const
-    { //NOTE: only relevant for 3d, not implemented!
-      return 10;
-    }
-
-    //returns the recommended quadrature order to compute an integral
-    //over x * qInterface(x)
-    int quadratureOrder_qInterface () const
-    {
-      return 10;
-    }
+  //returns the recommended quadrature order to compute an integral
+  //over x * qInterface(x)
+  int quadratureOrder_qInterface () const
+  {
+    return 10;
+  }
 };
 
 #endif
diff --git a/dune/mmdg/problems/mmdgproblem3.hh b/dune/mmdg/problems/mmdgproblem3.hh
index bfb78bb71286de6328d3e7b074cd324617a90bea..c279785b8d36568687d81bb77075ef8f319ce703 100644
--- a/dune/mmdg/problems/mmdgproblem3.hh
+++ b/dune/mmdg/problems/mmdgproblem3.hh
@@ -5,81 +5,109 @@
 #include <dune/mmdg/problems/coupleddgproblem.hh>
 
 //a coupled dg problem for dim = 2,
-//taken from [Antonietti et al. (2019): Example 6.3]
+//taken from [Antonietti et al. (2019): Example 6.1]
 template<class Coordinate, class Scalar = double>
 class MMDGProblem3 : public CoupledDGProblem<Coordinate, Scalar>
 {
-  public:
-    static constexpr int dim = Coordinate::dimension;
+public:
+  static constexpr int dim = Coordinate::dimension;
+  using Base = CoupledDGProblem<Coordinate, Scalar>;
+  using Matrix = typename Base::Matrix;
 
-    //the exact bulk solution at position pos
-    Scalar exactSolution (const Coordinate& pos) const
-    {
-      Scalar xPlusy = pos * Coordinate(1.0);
-      Scalar solution = std::exp(xPlusy);
-      return (xPlusy < 1.0) ? solution :
-        0.5 * solution + std::exp(1.0) * (0.5 + 1.5 * sqrt(2) * this->aperture(pos));
-    }
+  //constructor
+  MMDGProblem3 (const Scalar d) : d_(d) {}
 
-    //the exact solution on the interface at position pos
-    Scalar exactInterfaceSolution (const Coordinate& pos) const
-    {
-      return std::exp(1.0) * (1.0 + sqrt(2) * this->aperture(pos));
-    }
+  //the exact bulk solution at position pos
+  Scalar exactSolution (const Coordinate& pos) const
+  {
+    Scalar xPlusy = pos * Coordinate(1.0);
+    Scalar solution = std::exp(xPlusy);
+    return (xPlusy < 1.0) ? solution :
+      0.5 * solution + std::exp(1.0) * (0.5 + 1.5 / sqrt(2.0) * d_);
+  }
 
-    //indicates whether an exact solution is implemented for the problem
-    bool hasExactSolution () const
-    {
-      return true;
-    };
+  //the exact solution on the interface at position pos
+  Scalar exactInterfaceSolution (const Coordinate& pos) const
+  {
+    return std::exp(1.0) * ( 1.0 + 1.0 / sqrt(2.0) * d_ );
+  }
 
-    //bulk source term at position pos
-    Scalar q (const Coordinate& pos) const
-    {
-      Scalar xPlusy = pos * Coordinate(1.0);
-      Scalar source = -std::exp(xPlusy);
-      return (xPlusy < 1.0) ? -2.0 * source : source;
-    }
+  //indicates whether an exact solution is implemented for the problem
+  bool hasExactSolution () const
+  {
+    return true;
+  };
 
-    //interface source term at position pos
-    Scalar qInterface (const Coordinate& pos) const
-    {
-      return std::exp(1.0) / sqrt(2);
-    }
+  //bulk source term at position pos
+  Scalar q (const Coordinate& pos) const
+  {
+    Scalar xPlusy = pos * Coordinate(1.0);
+    Scalar source = -std::exp(xPlusy);
+    return (xPlusy < 1.0) ? 2.0 * source : source;
+  }
 
-    // //aperture d of the fracture at position pos
-    // Scalar aperture (const Coordinate& pos) const
-    // {
-    //   return Scalar(1.0);
-    // }
+  //interface source term at position pos
+  Scalar qInterface (const Coordinate& pos) const
+  {
+    constexpr Scalar iSource = std::exp(1.0) / (sqrt(2.0));
+    return iSource;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * q(x)
-    int quadratureOrder_q () const
-    {
-      return 10;
-    }
+  //aperture d of the fracture at position pos
+  Scalar aperture (const Coordinate& pos) const
+  {
+    return d_;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * boundary(x)
-    int quadratureOrderBoundary () const
-    {
-      return 10;
-    }
+  //permeability per aperture of the fracture in normal direction at position pos
+  Scalar Kperp (const Coordinate& pos) const
+  {
+    return 1.0 / d_;
+  }
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * interfaceBoundary(x)
-    int quadratureOrderInterfaceBoundary () const
-    { //NOTE: only relevant for 3d, not implemented!
-      return 10;
-    }
+  //tangential permeability per aperture tensor of the interface at position pos
+  Matrix Kparallel (const Coordinate& pos) const
+  {
+    Matrix permeability(0.0);
 
-    //returns the recommended quadrature order to compute an integral
-    //over x * qInterface(x)
-    int quadratureOrder_qInterface () const
+    for (int i = 0; i < dim; i++)
     {
-      return 10;
+      permeability[i][i] = 1.0 / d_;
     }
+
+    return permeability;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * q(x)
+  int quadratureOrder_q () const
+  {
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * boundary(x)
+  int quadratureOrderBoundary () const
+  {
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * interfaceBoundary(x)
+  int quadratureOrderInterfaceBoundary () const
+  { //NOTE: only relevant for 3d, not implemented!
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * qInterface(x)
+  int quadratureOrder_qInterface () const
+  {
+    return 10;
+  }
+
+private:
+  Scalar d_; //aperture
 };
 
 #endif
diff --git a/dune/mmdg/problems/mmdgproblem4.hh b/dune/mmdg/problems/mmdgproblem4.hh
new file mode 100644
index 0000000000000000000000000000000000000000..50777e829fe6f3ccc05b2fae67eefde119346c4e
--- /dev/null
+++ b/dune/mmdg/problems/mmdgproblem4.hh
@@ -0,0 +1,116 @@
+#ifndef __DUNE_MMDG_MMDGPROBLEM4_HH__
+#define __DUNE_MMDG_MMDGPROBLEM4_HH__
+
+#include <cmath>
+#include <dune/mmdg/problems/coupleddgproblem.hh>
+
+//a coupled dg problem
+template<class Coordinate, class Scalar = double>
+class MMDGProblem4 : public CoupledDGProblem<Coordinate, Scalar>
+{
+public:
+  static constexpr int dim = Coordinate::dimension;
+  using Base = CoupledDGProblem<Coordinate, Scalar>;
+  using Matrix = typename Base::Matrix;
+
+  //constructor
+  MMDGProblem4 (const Scalar d) : d_(d) {}
+
+  //the exact bulk solution at position pos
+  Scalar exactSolution (const Coordinate& pos) const
+  {
+    Scalar solution = pos[0] * pos[0] - pos[1] * pos[1];
+
+    if (pos[0] > 0.5)
+    {
+      return solution += d_;
+    }
+
+    return solution;
+  }
+
+  //the exact solution on the interface at position pos
+  Scalar exactInterfaceSolution (const Coordinate& pos) const
+  {
+    //return 1.5;
+    return pos[0] * pos[0] - pos[1] * pos[1] + 0.5 * d_;
+  }
+
+  //indicates whether an exact solution is implemented for the problem
+  bool hasExactSolution () const
+  {
+    return true;
+  };
+
+  //source term at position pos
+  Scalar q (const Coordinate& pos) const
+  {
+    return 0.0;
+  }
+
+  //interface source term at position pos
+  Scalar qInterface (const Coordinate& pos) const
+  {
+    return 2.0 * d_; //d^2
+  }
+
+  //aperture d of the fracture at position pos
+  Scalar aperture (const Coordinate& pos) const
+  {
+    return d_;
+  }
+
+  //permeability of the fracture in normal direction at position pos
+  Scalar Kperp (const Coordinate& pos) const
+  {
+    return Scalar(1.0) / d_;
+  }
+
+  //tangential permeability tensor of the interface at position pos
+  Matrix Kparallel (const Coordinate& pos) const
+  {
+    Matrix permeability(0.0);
+
+    for (int i = 0; i < dim; i++)
+    {
+      permeability[i][i] = 1.0 / d_;
+    }
+
+    //return identity matrix
+    return permeability;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * boundary(x)
+  int quadratureOrderBoundary () const
+  {
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * interfaceBoundary(x)
+  int quadratureOrderInterfaceBoundary () const
+  { //NOTE: only relevant for 3d, not implemented!
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * qInterface(x)
+  int quadratureOrder_qInterface () const
+  {
+    return 10;
+  }
+
+  //returns the recommended quadrature order to compute an integral
+  //over x * q(x)
+  int quadratureOrder_q () const
+  {
+    return 10;
+  }
+
+private:
+  Scalar d_; //aperture
+
+};
+
+#endif
diff --git a/src/grids/mmdg2.msh b/src/grids/mmdg2.msh
deleted file mode 100644
index 343b392ba70b95ac2d0dad7c7513764fa3bff4f5..0000000000000000000000000000000000000000
--- a/src/grids/mmdg2.msh
+++ /dev/null
@@ -1,1618 +0,0 @@
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-776 2 2 1 1 338 183 479
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-781 2 2 1 1 355 294 492
-782 2 2 1 1 443 238 480
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-784 2 2 1 1 192 329 436
-785 2 2 1 1 449 203 599
-786 2 2 1 1 48 313 521
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-788 2 2 1 1 195 316 503
-789 2 2 1 1 310 185 457
-790 2 2 1 1 354 187 490
-791 2 2 1 1 156 361 377
-792 2 2 1 1 231 336 528
-793 2 2 1 1 130 329 530
-794 2 2 1 1 149 316 497
-795 2 2 1 1 99 355 433
-796 2 2 1 1 326 217 461
-797 2 2 1 1 71 72 417
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-799 2 2 1 1 43 44 472
-800 2 2 1 1 118 310 457
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-803 2 2 1 1 93 322 477
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-807 2 2 1 1 306 197 527
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-811 2 2 1 1 145 310 468
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-813 2 2 1 1 478 244 479
-814 2 2 1 1 322 193 477
-815 2 2 1 1 183 440 595
-816 2 2 1 1 310 118 470
-817 2 2 1 1 311 149 490
-818 2 2 1 1 307 228 592
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-823 2 2 1 1 166 329 409
-824 2 2 1 1 332 129 506
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-826 2 2 1 1 149 311 503
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-828 2 2 1 1 185 310 555
-829 2 2 1 1 316 118 457
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-839 2 2 1 1 362 171 462
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-845 2 2 1 1 321 263 501
-846 2 2 1 1 216 309 550
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-852 2 2 1 1 174 344 419
-853 2 2 1 1 175 345 420
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-856 2 2 1 1 351 174 419
-857 2 2 1 1 348 177 422
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-859 2 2 1 1 350 176 421
-860 2 2 1 1 312 146 580
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-864 2 2 1 1 209 346 568
-865 2 2 1 1 210 347 569
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-869 2 2 1 1 59 368 396
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-890 2 2 1 1 212 319 507
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-922 2 2 1 1 121 338 479
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-927 2 2 1 1 254 452 573
-928 2 2 1 1 39 40 547
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-979 2 2 1 1 201 463 512
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-981 2 2 1 1 415 104 539
-982 2 2 1 1 178 382 450
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-984 2 2 1 1 194 355 492
-985 2 2 1 1 440 250 549
-986 2 2 1 1 247 402 451
-987 2 2 1 1 171 333 565
-988 2 2 1 1 413 191 438
-989 2 2 1 1 208 348 532
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-991 2 2 1 1 210 350 534
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-994 2 2 1 1 339 186 590
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-997 2 2 1 1 87 344 562
-998 2 2 1 1 99 347 561
-999 2 2 1 1 95 346 560
-1000 2 2 1 1 515 276 566
-1001 2 2 1 1 388 21 469
-1002 2 2 1 1 104 385 539
-1003 2 2 1 1 192 353 554
-1004 2 2 1 1 370 200 514
-1005 2 2 1 1 199 369 513
-1006 2 2 1 1 106 395 593
-1007 2 2 1 1 236 352 559
-1008 2 2 1 1 418 162 520
-1009 2 2 1 1 34 370 514
-1010 2 2 1 1 369 78 513
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-1016 2 2 1 1 196 482 593
-1017 2 2 1 1 214 389 488
-1018 2 2 1 1 205 408 525
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-1020 2 2 1 1 458 106 482
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-1023 2 2 1 1 358 209 568
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-1050 2 2 1 1 500 201 536
-1051 2 2 1 1 430 182 484
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-1061 2 2 1 1 280 462 565
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-1063 2 2 1 1 120 381 595
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-1081 2 2 1 1 425 279 567
-1082 2 2 1 1 205 403 542
-1083 2 2 1 1 233 400 543
-1084 2 2 1 1 427 300 517
-1085 2 2 1 1 163 427 517
-1086 2 2 1 1 197 407 549
-1087 2 2 1 1 151 398 576
-1088 2 2 1 1 261 467 537
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-1090 2 2 1 1 449 131 524
-1091 2 2 1 1 417 72 529
-1092 2 2 1 1 203 449 524
-1093 2 2 1 1 553 235 571
-1094 2 2 1 1 449 215 582
-1095 2 2 1 1 131 449 582
-1096 2 2 1 1 120 440 549
-1097 2 2 1 1 276 428 566
-1098 2 2 1 1 413 138 566
-1099 2 2 1 1 228 425 567
-1100 2 2 1 1 575 232 596
-1101 2 2 1 1 209 533 560
-1102 2 2 1 1 210 534 561
-1103 2 2 1 1 208 532 562
-1104 2 2 1 1 211 535 563
-1105 2 2 1 1 207 486 521
-1106 2 2 1 1 486 207 522
-1107 2 2 1 1 516 254 573
-1108 2 2 1 1 486 47 521
-1109 2 2 1 1 46 486 522
-1110 2 2 1 1 213 516 573
-1111 2 2 1 1 443 148 575
-1112 2 2 1 1 132 540 594
-1113 2 2 1 1 177 466 569
-1114 2 2 1 1 540 252 594
-1115 2 2 1 1 462 131 582
-1116 2 2 1 1 487 128 543
-1117 2 2 1 1 252 444 594
-1118 2 2 1 1 216 550 579
-1119 2 2 1 1 440 120 595
-1120 2 2 1 1 214 488 558
-1121 2 2 1 1 215 449 599
-1122 2 2 1 1 488 105 558
-1123 2 2 1 1 518 269 584
-1124 2 2 1 1 270 519 585
-1125 2 2 1 1 223 518 584
-1126 2 2 1 1 519 224 585
-1127 2 2 1 1 572 137 599
-1128 2 2 1 1 482 106 593
-1129 2 2 1 1 228 567 592
-1130 2 2 1 1 532 86 562
-1131 2 2 1 1 533 94 560
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-1134 2 2 1 1 573 132 594
-1135 2 2 1 1 550 140 579
-1136 2 2 1 1 567 141 592
-$EndElements
diff --git a/src/mmdg.cc b/src/mmdg.cc
index 503e4ebce7c4b368e2010fe15c9a98b483af26ef..20d7d6de0762ab0e1d9ae12edd65b5b65976439d 100644
--- a/src/mmdg.cc
+++ b/src/mmdg.cc
@@ -23,6 +23,7 @@
 #include <dune/mmdg/problems/mmdgproblem1.hh>
 #include <dune/mmdg/problems/mmdgproblem2.hh>
 #include <dune/mmdg/problems/mmdgproblem3.hh>
+#include <dune/mmdg/problems/mmdgproblem4.hh>
 
 int main(int argc, char** argv)
 {
@@ -54,6 +55,7 @@ int main(int argc, char** argv)
     //assume constant penalty parameter //TODO
     const double mu = std::stod(pt["mu"]);
     const double xi = std::stod(pt["xi"]); //coupling parameter
+    const double aperture = std::stod(pt["d"]);
 
     Problem* problem; //problem to be solved
 
@@ -62,18 +64,23 @@ int main(int argc, char** argv)
     //determine problem type
     if (pt["problem"] == "mmdg1")
     {
-      problem = new MMDGProblem1<Coordinate>();
-      gridType = "mmdg2";
+      problem = new MMDGProblem1<Coordinate>(aperture);
+      gridType = "mmdg2_5e-2";
     }
     else if (pt["problem"] == "mmdg2")
     {
       problem = new MMDGProblem2<Coordinate>();
-      gridType = "mmdg2";
+      gridType = "mmdg2_5e-2";
     }
     else if (pt["problem"] == "mmdg3")
     {
-      problem = new MMDGProblem3<Coordinate>();
-      gridType = "mmdg3";
+      problem = new MMDGProblem3<Coordinate>(aperture);
+      gridType = "mmdg3_5e-2";
+    }
+    else if (pt["problem"] == "mmdg4")
+    {
+      problem = new MMDGProblem4<Coordinate>(aperture);
+      gridType = "mmdg2_5e-2";
     }
     else
     {
diff --git a/src/mmdgAnalysis.py b/src/mmdgAnalysis.py
index ff746bd0a7b2e3e58779824cbe25e1e07af73f2b..c66dd514341f1a88a1b75593be2f175655f24a4b 100644
--- a/src/mmdgAnalysis.py
+++ b/src/mmdgAnalysis.py
@@ -62,6 +62,7 @@ numberOfMeans = 1
 
 # names of the grid files sorted by refinement
 gridfiles = ["mmdg2_1", "mmdg2_5e-1", "mmdg2_2e-1", "mmdg2_8e-2", "mmdg2_5e-2"]
+# gridfiles = ["mmdg3_1", "mmdg3_5e-1", "mmdg3_2e-1", "mmdg3_8e-2", "mmdg3_5e-2"]
 
 dim = 2
 
diff --git a/src/parameterMMDG.ini b/src/parameterMMDG.ini
index fb6290810e44ee0860375165a8e320bef7eea5d2..a6283fc3114613f0a0e3f66adc1fcb6338c5992e 100644
--- a/src/parameterMMDG.ini
+++ b/src/parameterMMDG.ini
@@ -1,4 +1,5 @@
 mu = 1000
 xi = 0.75
-problem = mmdg1
-gridfile = mmdg2_5e-2
\ No newline at end of file
+problem = mmdg2
+gridfile = mmdg2_5e-2
+d = 1