diff --git a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGeneratorTest.cpp b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGeneratorTest.cpp
index 17185ef21a9a3aa459cd7c8ca8eb34cb1360fe62..3009bc4ae449b917f494cdf39145a2e94df2ddb8 100644
--- a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGeneratorTest.cpp
+++ b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGeneratorTest.cpp
@@ -22,7 +22,7 @@ private:
 public:
     uint numberOfSendIndices = 0;
 
-    LevelGridBuilderStub(SPtr<Grid> grid) : LevelGridBuilder(), grid(grid){};
+    explicit LevelGridBuilderStub(SPtr<Grid> grid) : LevelGridBuilder(), grid(grid){};
 
     uint getCommunicationProcess(int direction) override
     {
@@ -59,7 +59,7 @@ public:
 class CudaMemoryManagerDouble : public CudaMemoryManager
 {
 public:
-    CudaMemoryManagerDouble(std::shared_ptr<Parameter> parameter) : CudaMemoryManager(parameter){};
+    explicit CudaMemoryManagerDouble(std::shared_ptr<Parameter> parameter) : CudaMemoryManager(parameter){};
 
     void cudaAllocProcessNeighborX(int lev, unsigned int processNeighbor) override{};
     void cudaCopyProcessNeighborXIndex(int lev, unsigned int processNeighbor) override{};
diff --git a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreams.cpp b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreams.cpp
index 58e753b05153699ee93ee1e655ff21c742fe6e25..4cd8769407220ec97030489585009d435a6cce8e 100644
--- a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreams.cpp
+++ b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreams.cpp
@@ -493,7 +493,7 @@ void IndexRearrangementForStreams::reorderRecvIndicesForCommAfterFtoC(
     VF_LOG_INFO("Reorder recv indices for communication after fine to coarse: level: {} direction: {}", level,
                 direction);
 
-    if (sendIndicesForCommAfterFtoCPositions.size() <= 0)
+    if (sendIndicesForCommAfterFtoCPositions.size() == 0)
         VF_LOG_WARNING("ReorderRecvIndicesForCommAfterFtoC(): sendIndicesForCommAfterFtoCPositions is empty.");
 
     uint numberOfRecvIndices = builder->getNumberOfReceiveIndices(direction, level);
diff --git a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreamsTest.cpp b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreamsTest.cpp
index 5b8bd50bdebcbd4e37a240223b52b967f274d1ae..7bf534013ab68ba6a58fb3f33ca4ae03610cc12d 100644
--- a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreamsTest.cpp
+++ b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreamsTest.cpp
@@ -18,7 +18,7 @@
 namespace indexRearrangementTests
 {
 template <typename T>
-bool vectorsAreEqual(const T *vector1, const std::vector<T> vectorExpected)
+bool vectorsAreEqual(const T *vector1, const std::vector<T>& vectorExpected)
 {
     for (uint i = 0; i < vectorExpected.size(); i++) {
         if (vector1[i] != vectorExpected[i])
@@ -179,7 +179,7 @@ public:
         return 0;
     }
 
-    void setReceivedIndices(std::vector<uint> receivedIndices)
+    void setReceivedIndices(const std::vector<uint>& receivedIndices)
     {
         this->receivedIndices = receivedIndices;
     }
diff --git a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
index ca7a63244092f77ec398d830373197dfe385be26..d410340d2de7797cf23a781a64d11f592d62a6fb 100644
--- a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
+++ b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
@@ -99,20 +99,20 @@ public:
     virtual void cudaCopyProcessNeighborXIndex(int lev, unsigned int processNeighbor);
     void cudaFreeProcessNeighborX(int lev, unsigned int processNeighbor);
     //
-    void cudaAllocProcessNeighborY(int lev, unsigned int processNeighbor);
+    virtual void cudaAllocProcessNeighborY(int lev, unsigned int processNeighbor);
     void cudaCopyProcessNeighborYFsHD(int lev, unsigned int processNeighbor, const unsigned int &memsizeFsRecv,
                                       int streamIndex);
     void cudaCopyProcessNeighborYFsDH(int lev, unsigned int processNeighbor, const unsigned int &memsizeFsSend,
                                       int streamIndex);
-    void cudaCopyProcessNeighborYIndex(int lev, unsigned int processNeighbor);
+    virtual void cudaCopyProcessNeighborYIndex(int lev, unsigned int processNeighbor);
     void cudaFreeProcessNeighborY(int lev, unsigned int processNeighbor);
     //
-    void cudaAllocProcessNeighborZ(int lev, unsigned int processNeighbor);
+    virtual void cudaAllocProcessNeighborZ(int lev, unsigned int processNeighbor);
     void cudaCopyProcessNeighborZFsHD(int lev, unsigned int processNeighbor, const unsigned int &memsizeFsRecv,
                                       int streamIndex);
     void cudaCopyProcessNeighborZFsDH(int lev, unsigned int processNeighbor, const unsigned int &memsizeFsSend,
                                       int streamIndex);
-    void cudaCopyProcessNeighborZIndex(int lev, unsigned int processNeighbor);
+    virtual void cudaCopyProcessNeighborZIndex(int lev, unsigned int processNeighbor);
     void cudaFreeProcessNeighborZ(int lev, unsigned int processNeighbor);
 
     //////////////////////////////////////////////////////////////////////////