diff --git a/src/phasicFlow/containers/Field/Field.hpp b/src/phasicFlow/containers/Field/Field.hpp
index 405cf68e..887b994d 100644
--- a/src/phasicFlow/containers/Field/Field.hpp
+++ b/src/phasicFlow/containers/Field/Field.hpp
@@ -188,6 +188,11 @@ public:
 		{
 			this->fill(span, val);
 		}
+
+		void fillField(const T& val)
+		{
+			this->fill(val);
+		}
 		
 	//// - IO operations 
 		
diff --git a/src/phasicFlow/containers/List/anyList/anyList.hpp b/src/phasicFlow/containers/List/anyList/anyList.hpp
index 9ed114b1..b0d39405 100644
--- a/src/phasicFlow/containers/List/anyList/anyList.hpp
+++ b/src/phasicFlow/containers/List/anyList/anyList.hpp
@@ -51,7 +51,9 @@ protected:
 	anyListType 	anyList_;
 
 	/// List of variable names in anyList_ 
-	wordList 		names_;	
+	wordList 		names_;
+
+	wordList 		types_;	
 
 public:
 
@@ -89,6 +91,7 @@ public:
 				fatalExit;
 			}
 			names_.push_back(name);
+			types_.push_back(getTypeName<T>());
 			return anyList_.emplace_back( 
 				std::in_place_type<T>, 
 				std::forward<Args>(args)...);
@@ -106,6 +109,7 @@ public:
 				fatalExit;
 			}
 			names_.push_back(name);
+			types_.push_back(getTypeName<T>());
 			return anyList_.emplace_back(std::in_place_type<T>, other);
 		}
 
@@ -121,6 +125,7 @@ public:
 				fatalExit;
 			}
 			names_.push_back(name);
+			types_.push_back(getTypeName<T>());
 			return anyList_.emplace_back(std::in_place_type<T>, std::move(other));
 		}
 
diff --git a/src/phasicFlow/containers/Map/hashMap/hashMap.hpp b/src/phasicFlow/containers/Map/hashMap/hashMap.hpp
index 1761b552..042800f5 100644
--- a/src/phasicFlow/containers/Map/hashMap/hashMap.hpp
+++ b/src/phasicFlow/containers/Map/hashMap/hashMap.hpp
@@ -43,6 +43,8 @@ public:
 	
 	using hashmapType 	= std::unordered_map<Key, T, Hash>;
 
+	using hasher 		= typename hashmapType::hasher;
+
 	using iterator 		= typename hashmapType::iterator;
 	
 	using constIterator = typename hashmapType::const_iterator;
@@ -75,46 +77,24 @@ public:
 		{}
 
 		// - Copy construct
-		hashMap(const hashMapType & src)
-		:
-			hashmapType(src)
-		{}
+		hashMap(const hashMapType & src) = default;
 
 		// - Move construct 
-		hashMap( hashMapType&& src)
-		:
-			hashmapType(std::move(src))
-		{}
+		hashMap( hashMapType&& src) = default;
 
 		// - Copy assignment
-		hashMapType& operator=(const hashMapType& rhs)
-		{
-			hashmapType::operator=(rhs);
-			return *this;
-		}
-
+		hashMapType& operator=(const hashMapType& rhs) = default;
+		
 		// - Move assignment
-		hashMapType& operator=(hashMapType&& rhs)
-		{
-			hashmapType::operator=( std::move(rhs));
-			return *this;
-		}
-
+		hashMapType& operator=(hashMapType&& rhs) = default;
+		
 		uniquePtr<hashMapType> clone()const
 		{
 			return makeUnique<hashMapType>(*this);
 		}
 
-		hashMapType* clonePtr()const
-		{
-			return new hashMapType(*this);
-		}	
-
-		~hashMap()
-		{
-			this->clear();
-		}
-
+		~hashMap() = default;
+	
 
 	//// - Methods	
 
diff --git a/src/phasicFlow/containers/VectorHD/VectorSingle.cpp b/src/phasicFlow/containers/VectorHD/VectorSingle.cpp
index 0f9e4638..1ea576d2 100644
--- a/src/phasicFlow/containers/VectorHD/VectorSingle.cpp
+++ b/src/phasicFlow/containers/VectorHD/VectorSingle.cpp
@@ -509,7 +509,7 @@ void pFlow::VectorSingle<T,MemorySpace>::assign
 
 template<typename T, typename MemorySpace>
 INLINE_FUNCTION_H 
-void pFlow::VectorSingle<T,MemorySpace>::assign(const VectorTypeHost& src)
+void pFlow::VectorSingle<T,MemorySpace>::assignFromHost(const VectorTypeHost& src)
 {
 	uint32 srcSize = src.size();
 	uint32 srcCap = src.capacity();
@@ -540,7 +540,45 @@ void pFlow::VectorSingle<T,MemorySpace>::assign(const VectorTypeHost& src)
     }
 }
 
+template<typename T, typename MemorySpace>
+INLINE_FUNCTION_H
+void pFlow::VectorSingle<T,MemorySpace>::assign
+(
+    const VectorType& src, 
+    bool srcCapacity
+)
+{
+    uint32 srcSize = src.size();
+	uint32 srcCap = src.capacity();
+
+    if(srcCapacity && srcCap != capacity())
+    {
+        reallocateCapacitySize(srcCap, srcSize);
+    }
+    else
+    {
+        setSize(srcSize);
+    }
+
+    if constexpr(isTriviallyCopyable_)
+    {
+        copy(deviceView(), src.deviceView());
+    }
+    else if constexpr( isHostAccessible_)
+    {
+        for(auto i=0u; i<src.size(); i++)
+        {
+            view_[i] = src.view_[i];
+        }
+    }
+    else
+    {
+        static_assert("Not a valid operation for this data type on device memory");
+    }
+}
+
 template <typename T, typename MemorySpace>
+INLINE_FUNCTION_H
 void pFlow::VectorSingle<T, MemorySpace>::append
 (
     const std::vector<T> &appVec
@@ -575,6 +613,41 @@ void pFlow::VectorSingle<T, MemorySpace>::append
     
 }
 
+template <typename T, typename MemorySpace>
+INLINE_FUNCTION_H
+void pFlow::VectorSingle<T, MemorySpace>::append
+(
+    const VectorType& appVec
+)
+{
+    uint32 appSize  = appVec.size();
+	if(appSize == 0) return;
+
+	uint32 oldS = size();
+	uint32 newSize = oldS + appSize; 
+
+	setSize(newSize);
+	auto appendView = Kokkos::subview(
+		view_,
+		Kokkos::make_pair<uint32>(oldS, newSize));
+	
+    if constexpr( isTriviallyCopyable_)
+    {
+        copy(appendView, appVec.deviceView());
+    }
+    else if constexpr( isHostAccessible_)
+    {
+        for(auto i=0u; i<appVec.size(); i++)
+        {
+            appendView[i] = appVec.view_[i];
+        }
+    }
+    else
+    {
+        static_assert("not a valid operation for this data type on device memory");
+    }
+}
+
 template <typename T, typename MemorySpace>
 INLINE_FUNCTION_H auto pFlow::VectorSingle<T, MemorySpace>::getSpan()
 {
diff --git a/src/phasicFlow/containers/VectorHD/VectorSingle.hpp b/src/phasicFlow/containers/VectorHD/VectorSingle.hpp
index 1461503f..1243d501 100644
--- a/src/phasicFlow/containers/VectorHD/VectorSingle.hpp
+++ b/src/phasicFlow/containers/VectorHD/VectorSingle.hpp
@@ -284,10 +284,16 @@ public:
 		/// The size of *this becomes the size of src. 
 		/// The capacity of *this becomes the capacity of src.
 		INLINE_FUNCTION_H
-		void assign(const VectorTypeHost& src);
+		void assignFromHost(const VectorTypeHost& src);
+
+		INLINE_FUNCTION_H
+		void assign(const VectorType& src, bool srcCapacity = true);
 
 		INLINE_FUNCTION_H
 		void append(const std::vector<T>& appVec);
+
+		INLINE_FUNCTION_H
+		void append(const VectorType& appVec);
 		
 		INLINE_FUNCTION_H
 		auto getSpan();
diff --git a/src/phasicFlow/containers/pointField/boundaryField.cpp b/src/phasicFlow/containers/pointField/boundaryField/boundaryField.cpp
similarity index 100%
rename from src/phasicFlow/containers/pointField/boundaryField.cpp
rename to src/phasicFlow/containers/pointField/boundaryField/boundaryField.cpp
diff --git a/src/phasicFlow/containers/pointField/boundaryField.hpp b/src/phasicFlow/containers/pointField/boundaryField/boundaryField.hpp
similarity index 92%
rename from src/phasicFlow/containers/pointField/boundaryField.hpp
rename to src/phasicFlow/containers/pointField/boundaryField/boundaryField.hpp
index 9836599c..a0ad8a0e 100644
--- a/src/phasicFlow/containers/pointField/boundaryField.hpp
+++ b/src/phasicFlow/containers/pointField/boundaryField/boundaryField.hpp
@@ -52,10 +52,8 @@ protected:
 	static inline
 	const message defaultMessage_ = 
 	(
-		message::CAP_CHANGED+
-		message::SIZE_CHANGED+
-		message::ITEM_INSERT+
-		message::ITEM_DELETE
+		message::BNDR_RESET+
+		message::BNDR_REARRANGE		
 	);
 
 public:
@@ -95,8 +93,16 @@ public:
     	const anyList& varList
 	) override
     {
-		notImplementedFunction;
-		return false;
+		
+		if(msg.equivalentTo(message::BNDR_REARRANGE))
+		{
+			// do nothing
+		}
+		if(msg.equivalentTo(message::BNDR_RESET))
+		{
+			//do nothing
+		}
+		return true;
 	}
 
 	auto size()const
diff --git a/src/phasicFlow/containers/pointField/createBoundaryFields.hpp b/src/phasicFlow/containers/pointField/boundaryField/createBoundaryFields.hpp
similarity index 100%
rename from src/phasicFlow/containers/pointField/createBoundaryFields.hpp
rename to src/phasicFlow/containers/pointField/boundaryField/createBoundaryFields.hpp
diff --git a/src/phasicFlow/containers/pointField/exitBoundaryField.cpp b/src/phasicFlow/containers/pointField/boundaryField/exitBoundaryField.cpp
similarity index 100%
rename from src/phasicFlow/containers/pointField/exitBoundaryField.cpp
rename to src/phasicFlow/containers/pointField/boundaryField/exitBoundaryField.cpp
diff --git a/src/phasicFlow/containers/pointField/exitBoundaryField.hpp b/src/phasicFlow/containers/pointField/boundaryField/exitBoundaryField.hpp
similarity index 92%
rename from src/phasicFlow/containers/pointField/exitBoundaryField.hpp
rename to src/phasicFlow/containers/pointField/boundaryField/exitBoundaryField.hpp
index dbc942d7..8c5fcb57 100644
--- a/src/phasicFlow/containers/pointField/exitBoundaryField.hpp
+++ b/src/phasicFlow/containers/pointField/boundaryField/exitBoundaryField.hpp
@@ -70,8 +70,14 @@ public:
     	const anyList& varList
 	) override
     {
-		notImplementedFunction;
-		return false;
+		BoundaryFieldType::hearChanges(t,dt,iter, msg,varList);
+		
+		if(msg.equivalentTo(message::BNDR_DELETE))
+		{
+			// do nothing;
+		}
+		
+		return true;
 	}
 
 };
diff --git a/src/phasicFlow/containers/pointField/periodicBoundaryField.cpp b/src/phasicFlow/containers/pointField/boundaryField/periodicBoundaryField.cpp
similarity index 100%
rename from src/phasicFlow/containers/pointField/periodicBoundaryField.cpp
rename to src/phasicFlow/containers/pointField/boundaryField/periodicBoundaryField.cpp
diff --git a/src/phasicFlow/containers/pointField/periodicBoundaryField.hpp b/src/phasicFlow/containers/pointField/boundaryField/periodicBoundaryField.hpp
similarity index 100%
rename from src/phasicFlow/containers/pointField/periodicBoundaryField.hpp
rename to src/phasicFlow/containers/pointField/boundaryField/periodicBoundaryField.hpp
diff --git a/src/phasicFlow/containers/pointField/internalField.cpp b/src/phasicFlow/containers/pointField/internalField.cpp
index d75c6d5f..99bd7860 100644
--- a/src/phasicFlow/containers/pointField/internalField.cpp
+++ b/src/phasicFlow/containers/pointField/internalField.cpp
@@ -98,6 +98,46 @@ typename pFlow::internalField<T, MemorySpace>::FieldTypeHost
     return aField;
 }
 
+template <class T, class MemorySpace>
+bool pFlow::internalField<T, MemorySpace>:: hearChanges
+(
+	real t,
+	real dt,
+	uint32 iter,
+	const message& msg, 
+	const anyList& varList
+)
+{
+	if(msg.equivalentTo(message::CAP_CHANGED))
+	{
+		auto newCap = varList.getObject<uint32>(
+			message::eventName(message::CAP_CHANGED));
+
+		field_.reserve(newCap);
+	}
+	if(msg.equivalentTo(message::SIZE_CHANGED))
+	{
+		auto newSize = varList.getObject<uint32>(
+			message::eventName(message::SIZE_CHANGED));
+		field_.resize(newSize);
+	}
+	if(msg.equivalentTo(message::ITEM_DELETE))
+	{
+		// do nothing
+	}
+	if(msg.equivalentTo(message::ITEM_REARRANGE))
+	{
+		notImplementedFunction;
+		return false;
+	}
+	if(msg.equivalentTo(message::ITEM_INSERT))
+	{
+		notImplementedFunction;
+		return false;
+	}
+	return true;
+}
+
 template<class T, class MemorySpace>
 bool pFlow::internalField<T, MemorySpace>::write
 (
diff --git a/src/phasicFlow/containers/pointField/internalField.hpp b/src/phasicFlow/containers/pointField/internalField.hpp
index d92fff0f..92ba1bf6 100644
--- a/src/phasicFlow/containers/pointField/internalField.hpp
+++ b/src/phasicFlow/containers/pointField/internalField.hpp
@@ -24,6 +24,7 @@ Licence:
 #include "Field.hpp"
 #include "observer.hpp"
 #include "dataIO.hpp"
+#include "anyList.hpp"
 
 
 namespace pFlow
@@ -59,6 +60,7 @@ protected:
 	const message defaultMessage_ = 
 	(
 		message::CAP_CHANGED+
+		message::SIZE_CHANGED+
 		message::ITEM_INSERT+
 		message::ITEM_REARRANGE+
 		message::ITEM_DELETE
@@ -75,6 +77,11 @@ public:
 		const internalPoints& internal,
 		const T& val);
 	
+	inline 
+	const auto& deviceViewAll()const
+	{
+		return field_.deviceViewAll();
+	}
 	inline
 	auto deviceView()const
 	{
@@ -166,11 +173,8 @@ public:
 		uint32 iter,
 		const message& msg, 
 		const anyList& varList
-	) override
-	{
-		notImplementedFunction;
-		return false;
-	}
+	) override;
+	
 
 	//// - IO
 
diff --git a/src/phasicFlow/containers/pointField/internalFieldAlgorithms.hpp b/src/phasicFlow/containers/pointField/internalFieldAlgorithms.hpp
index 8f94bfb6..118fb21c 100644
--- a/src/phasicFlow/containers/pointField/internalFieldAlgorithms.hpp
+++ b/src/phasicFlow/containers/pointField/internalFieldAlgorithms.hpp
@@ -194,7 +194,58 @@ Pair<T,T> minMax(const internalField<T,MemorySpace>& iField)
     }
 }
 
+template<class T, class MemorySpace>
+inline 
+void fillSequence(internalField<T,MemorySpace>& iField, const T& startVal)
+{
+    using exeSpace = typename internalField<T,MemorySpace>::execution_space;
 
+    using policy = Kokkos::RangePolicy<
+			exeSpace,
+			Kokkos::IndexType<uint32> >;
+
+    if constexpr(isDeviceAccessible<exeSpace>())
+    {               
+        auto maskD = iField.activePointsMaskDevice();
+        auto aRange = maskD.activeRange();
+        auto field = iField.field().deviceViewAll();
+        auto aPoints = maskD.getActivePoints();
+        exclusiveScan(aPoints,0, aRange.end(), aPoints,0);
+        
+        Kokkos::parallel_for(
+            "internalField::fillSequence",
+            policy(aRange.start(), aRange.end() ),
+            LAMBDA_HD(uint32 i)
+            {
+                if(maskD(i))
+                {
+                    field[i] = aPoints[i]+startVal;
+                }
+            });
+        Kokkos::fence();
+    }
+    else
+    {
+        // this is a host view 
+        auto maskH = iField.activePointsMaskHost();
+        auto aRange = maskH.activeRange();
+        auto field = iField.field().deviceViewAll();
+        auto aPoints = maskH.getActivePoints();
+        exclusiveScan(aPoints,0, aRange.end(), aPoints,0);
+        
+        Kokkos::parallel_for(
+            "internalField::fillSequence",
+            policy(aRange.start(), aRange.end() ),
+            LAMBDA_HD(uint32 i)
+            {
+                if(maskH(i))
+                {
+                    field[i] = aPoints[i]+startVal;
+                }
+            });
+        Kokkos::fence();
+    }
+}
 
 }
 
diff --git a/src/phasicFlow/containers/pointField/pointField.cpp b/src/phasicFlow/containers/pointField/pointField.cpp
index 5b444402..0a6315ab 100644
--- a/src/phasicFlow/containers/pointField/pointField.cpp
+++ b/src/phasicFlow/containers/pointField/pointField.cpp
@@ -274,7 +274,7 @@ bool pFlow::pointField<T, MemorySpace>::readPointField
         return false;
     }
 
-	this->field_.assign(internal);
+	this->field_.assignFromHost(internal);
 
 	return true;
 }
diff --git a/src/phasicFlow/containers/pointField/pointFields.cpp b/src/phasicFlow/containers/pointField/pointFields.cpp
index 09a979b1..f116e5ee 100644
--- a/src/phasicFlow/containers/pointField/pointFields.cpp
+++ b/src/phasicFlow/containers/pointField/pointFields.cpp
@@ -60,6 +60,14 @@ template class pFlow::pointField<pFlow::uint32>;
 createBaseBoundary(pFlow::uint32, void);
 createAllBoundary(pFlow::uint32, void);
 
+template class pFlow::pointField<pFlow::uint64, pFlow::HostSpace>; 
+createBaseBoundary(pFlow::uint64, pFlow::HostSpace);
+createAllBoundary(pFlow::uint64, pFlow::HostSpace);
+
+template class pFlow::pointField<pFlow::uint64>; 
+createBaseBoundary(pFlow::uint64, void);
+createAllBoundary(pFlow::uint64, void);
+
 template class pFlow::pointField<pFlow::real, pFlow::HostSpace>; 
 createBaseBoundary(pFlow::real, pFlow::HostSpace);
 createAllBoundary(pFlow::real, pFlow::HostSpace);
diff --git a/src/phasicFlow/containers/symArrayHD/symArrayHD.hpp b/src/phasicFlow/containers/symArrayHD/symArrayHD.hpp
index d1d0ddd7..9c7d1a67 100644
--- a/src/phasicFlow/containers/symArrayHD/symArrayHD.hpp
+++ b/src/phasicFlow/containers/symArrayHD/symArrayHD.hpp
@@ -23,22 +23,11 @@ Licence:
 
 #include "KokkosTypes.hpp"
 
-
 #include "types.hpp"
 #include "typeInfo.hpp"
 #include "Vector.hpp"
 
 
-/*
-stores the elemnt of a symetric array in the following order in a 1D vector
-
- 0  1  2  3
-    4  5  6
-       7  8  
-          9
-
-*/
-
 namespace pFlow
 {
 
@@ -52,6 +41,15 @@ void SWAP(Type &x, Type& y)
 	x = temp;
 }
 
+/*
+stores the elemnt of a symetric array in the following order in a 1D vector
+
+ 0  1  2  3
+    4  5  6
+       7  8  
+          9
+
+*/
 template<typename T, typename MemorySpace=void>
 class symArray
 {
@@ -82,14 +80,14 @@ class symArray
   	using execution_space 	= typename ViewType::execution_space;
 
   	
-protected:
+private:
 
-	uint32 			n_=0;
+	uint32 			n_= 0;
 
 	ViewType 		view_;
 
 
-	constexpr static inline const char* memoerySpaceName()
+	constexpr static const char* memoerySpaceName()
   	{
   		return memory_space::name();
   	}
@@ -97,14 +95,14 @@ protected:
 public:
 
 	// - type info
-	TypeInfoTemplateNV2("symArray", T, memoerySpaceName());
+	TypeInfoTemplateNV111("symArray", T, memoerySpaceName());
 
 	//// constructors 
 	INLINE_FUNCTION_H
 	symArray();
 
 	INLINE_FUNCTION_H
-	symArray(uint32 n)
+	explicit symArray(uint32 n)
 	:
 		symArray("symArray",n)
 	{}
@@ -125,7 +123,7 @@ public:
 	}
 
 	INLINE_FUNCTION_H
-	symArray(word name, Vector<T> src)
+	symArray(word name, const Vector<T>& src)
 	:
 		view_(name)
 	{
@@ -137,19 +135,19 @@ public:
 		}
 	}
 
-	INLINE_FUNCTION_H
+	INLINE_FUNCTION_HD
 	symArray(const symArray&) = default;
 
-	INLINE_FUNCTION_H
+	INLINE_FUNCTION_HD
 	symArray& operator=(const symArray&) = default;
 
-	INLINE_FUNCTION_H
-	symArray(symArray&&) = delete;
+	INLINE_FUNCTION_HD
+	symArray(symArray&&) = default;
 
-	INLINE_FUNCTION_H
-	symArray& operator=(symArray&&) = delete;
+	INLINE_FUNCTION_HD
+	symArray& operator=(symArray&&) = default;
 
-	INLINE_FUNCTION_H
+	INLINE_FUNCTION_HD
 	~symArray()=default;
 
 	
@@ -219,10 +217,10 @@ public:
 		bool write(iOstream& os)const
 		{
 			
-			int32 s = numElem(n_);
-			Vector<T, noConstructAllocator<T>> vecToFile(s);
+			uint32 s = numElem(n_);
+			Vector<T> vecToFile(view_.label(),s);
 			
-			const auto dVec = Kokkos::subview(view_, kPair<int32,int32>(0, s));
+			const auto dVec = Kokkos::subview(view_, Pair<uint32,uint32>(0, s));
 			hostViewType1D<T> mirror(vecToFile.data(), vecToFile.size());
 			Kokkos::deep_copy(mirror,dVec);
 
diff --git a/src/phasicFlow/containers/triSurfaceField/triSurfaceField.hpp b/src/phasicFlow/containers/triSurfaceField/triSurfaceField.hpp
index 9659ab66..54c4c0db 100644
--- a/src/phasicFlow/containers/triSurfaceField/triSurfaceField.hpp
+++ b/src/phasicFlow/containers/triSurfaceField/triSurfaceField.hpp
@@ -130,6 +130,41 @@ public:
 			field_.assign(vals, surface_.capacity());
 		}
 		
+		inline 
+		const auto& deviceViewAll()const
+		{
+			return field_.deviceViewAll();
+		}
+		inline
+		auto deviceView()const
+		{
+			return field_.deviceView();
+		}
+
+		inline
+		auto hostView()const
+		{
+			return field_.hostView();
+		}
+
+		inline
+		const FieldType& field()const
+		{
+			return field_;
+		}
+
+		inline
+		FieldType& field()
+		{
+			return field_;
+		}
+
+		inline 
+		void fill(const T& val)
+		{
+			field_.fillField(val);
+		}
+
 		bool hearChanges(
 		real t,
 		real dt,