3 files changed, 12 insertions, 4 deletions
diff --git a/src/refinement/coupler2D.hh b/src/refinement/coupler2D.hh
index 5614d16..d599728 100644
--- a/src/refinement/coupler2D.hh
+++ b/src/refinement/coupler2D.hh
@@ -160,7 +160,7 @@ void FineCoupler2D<T,DESCRIPTOR>::interpolate()
 template <typename T, template<typename> class DESCRIPTOR>
 void FineCoupler2D<T,DESCRIPTOR>::couple()
 {
-  auto& coarseLattice = this->_coarse.getSuperLattice();
+  const auto& coarseLattice = this->_coarse.getSuperLattice();
   auto& fineLattice   = this->_fine.getSuperLattice();
 
   for (int y=0; y < this->_coarseSize; ++y) {
@@ -333,7 +333,7 @@ CoarseCoupler2D<T,DESCRIPTOR>::CoarseCoupler2D(
 template <typename T, template<typename> class DESCRIPTOR>
 void CoarseCoupler2D<T,DESCRIPTOR>::couple()
 {
-  auto& fineLattice = this->_fine.getSuperLattice();
+  const auto& fineLattice = this->_fine.getSuperLattice();
   auto& coarseLattice = this->_coarse.getSuperLattice();
 
   for (int y=0; y < this->_coarseSize; ++y) {
diff --git a/src/refinement/grid2D.h b/src/refinement/grid2D.h
index 6d3579c..cc6bb62 100644
--- a/src/refinement/grid2D.h
+++ b/src/refinement/grid2D.h
@@ -76,7 +76,8 @@ public:
   CoarseCoupler2D<T,DESCRIPTOR>& addCoarseCoupling(
     Grid2D<T,DESCRIPTOR>& fineGrid, Vector<T,2> origin, Vector<T,2> extend);
 
-  Vector<T,2> alignToGrid(Vector<T,2> physR) const;
+  Vector<T,2> alignLocationToGrid(Vector<T,2> physR) const;
+  Vector<T,2> alignExtendToGrid(Vector<T,2> physR) const;
 
   Grid2D<T,DESCRIPTOR>& refine(IndicatorF2D<T>& domainF);
   Grid2D<T,DESCRIPTOR>& refine(Vector<T,2> origin, Vector<T,2> extend);
diff --git a/src/refinement/grid2D.hh b/src/refinement/grid2D.hh
index 65dd84d..59e23ce 100644
--- a/src/refinement/grid2D.hh
+++ b/src/refinement/grid2D.hh
@@ -181,7 +181,7 @@ Grid2D<T,DESCRIPTOR>& Grid2D<T,DESCRIPTOR>::refine(IndicatorF2D<T>& domainF)
 }
 
 template <typename T, template<typename> class DESCRIPTOR>
-Vector<T,2> Grid2D<T,DESCRIPTOR>::alignToGrid(Vector<T,2> physR) const
+Vector<T,2> Grid2D<T,DESCRIPTOR>::alignLocationToGrid(Vector<T,2> physR) const
 {
   Vector<int,3> latticeR{};
   _cuboids->getLatticeR(physR, latticeR);
@@ -189,6 +189,13 @@ Vector<T,2> Grid2D<T,DESCRIPTOR>::alignToGrid(Vector<T,2> physR) const
 }
 
 template <typename T, template<typename> class DESCRIPTOR>
+Vector<T,2> Grid2D<T,DESCRIPTOR>::alignExtendToGrid(Vector<T,2> extend) const
+{
+  const T deltaX = _converter->getPhysDeltaX();
+  return floor(extend / deltaX) * deltaX;
+}
+
+template <typename T, template<typename> class DESCRIPTOR>
 Grid2D<T,DESCRIPTOR>& Grid2D<T,DESCRIPTOR>::refine(Vector<T,2> origin, Vector<T,2> extend)
 {
   IndicatorCuboid2D<T> fineCuboid(extend, origin);