diff --git a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGenerator.cpp b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGenerator.cpp
index a41ed7b9a75dfd45c698dcbfad63e3f934b3d3c5..afb322267ab728fe8f373050296d7ed5a10d4b96 100644
--- a/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGenerator.cpp
+++ b/src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGenerator.cpp
@@ -960,6 +960,20 @@ void GridGenerator::allocArrays_OffsetScale()
 		cudaMemoryManager->cudaCopyInterfaceFC(level);
 		cudaMemoryManager->cudaCopyInterfaceOffCF(level);
 		cudaMemoryManager->cudaCopyInterfaceOffFC(level);
+        ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+        if (para->getUseStreams())
+            cudaMemoryManager->cudaCheckInterfaceFCBulk(level);
+
+        std::cout << "...Device " << std::endl;
+        std::cout << "old pointer " << para->getParD(level)->intFC.ICellFCC << std::endl;
+        std::cout << "border pointer (= old pointer) " << para->getParD(level)->intFCBorder.ICellFCC << std::endl;
+        std::cout << "bulk pointer new " << para->getParD(level)->intFCBulk.ICellFCC << std::endl;
+        std::cout << "sizeOld  " << para->getParD(level)->K_FC << std::endl;
+        std::cout << "sizeNew  " << para->getParD(level)->intFCBorder.kFC + para->getParD(level)->intFCBulk.kFC
+                  << " = border " << para->getParD(level)->intFCBorder.kFC << " + bulk "
+                  << para->getParD(level)->intFCBulk.kFC << std::endl;
     }
 }
 
diff --git a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp
index cf1314b1bffde1a38f016c7bc45b172757d22cdb..af937919aa1771733f711fdf5af5cae04c623f14 100644
--- a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp
+++ b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp
@@ -1063,6 +1063,14 @@ void CudaMemoryManager::cudaCopyInterfaceFC(int lev)
     checkCudaErrors( cudaMemcpy(parameter->getParD(lev)->intFC.ICellFCF, parameter->getParH(lev)->intFC.ICellFCF, parameter->getParH(lev)->mem_size_kFC, cudaMemcpyHostToDevice));
     checkCudaErrors( cudaMemcpy(parameter->getParD(lev)->intFC.ICellFCC, parameter->getParH(lev)->intFC.ICellFCC, parameter->getParH(lev)->mem_size_kFC, cudaMemcpyHostToDevice));
 }
+void CudaMemoryManager::cudaCheckInterfaceFCBulk(int lev)
+{
+    // only use for testing!
+    size_t memsize = sizeof(uint) * parameter->getParH(lev)->intFCBulk.kFC;
+    checkCudaErrors(cudaMemcpy(parameter->getParD(lev)->intFCBulk.ICellFCC, parameter->getParH(lev)->intFCBulk.ICellFCC, memsize, cudaMemcpyDeviceToDevice));
+    for (int i = 0; i < parameter->getParH(lev)->intFCBulk.kFC; i++)
+        printf("%d %d\n", i, parameter->getParH(lev)->intFCBulk.ICellFCC[i]);
+}
 void CudaMemoryManager::cudaFreeInterfaceFC(int lev)
 {
     checkCudaErrors( cudaFreeHost(parameter->getParH(lev)->intFC.ICellFCF));
diff --git a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
index e33b9c9ce68c34ffe382fbb0c6f1bc6ec5aa05e8..718cccbbb2cc3438a123406ba5abc53426e04ac4 100644
--- a/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
+++ b/src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h
@@ -149,6 +149,7 @@ public:
     
     void cudaAllocInterfaceFC(int lev);
     void cudaCopyInterfaceFC(int lev);
+    void cudaCheckInterfaceFCBulk(int lev);
     void cudaFreeInterfaceFC(int lev);
     
     void cudaAllocInterfaceOffCF(int lev);