diff --git a/apps/gpu/LBM/MusselOyster/MusselOyster.cpp b/apps/gpu/LBM/MusselOyster/MusselOyster.cpp
index bd5b7fce83d0f97c3e105cac6a3ed3632fb524a5..e277fc835d44b6e886c1f89f4386792df0b0f4c9 100644
--- a/apps/gpu/LBM/MusselOyster/MusselOyster.cpp
+++ b/apps/gpu/LBM/MusselOyster/MusselOyster.cpp
@@ -117,7 +117,7 @@ void multipleLevel(const std::string& configPath)
     std::string bivalveType = "MUSSEL"; // "MUSSEL" "OYSTER"
     std::string gridPath(gridPathParent + bivalveType); // only for GridGenerator, for GridReader the gridPath needs to be set in the config file
 
-    real dxGrid = (real)2.0;
+    real dxGrid = (real)1.0;
     real vxLB = (real)0.051; // LB units
     real Re = (real)300.0;
     real viscosityLB = (vxLB * dxGrid) / Re;
@@ -131,9 +131,14 @@ void multipleLevel(const std::string& configPath)
     *logging::out << logging::Logger::INFO_HIGH << "viscosity LB [dx^2/dt] = " << viscosityLB << "\n";
     *logging::out << logging::Logger::INFO_HIGH << "velocity real [m/s] = " << vxLB * para->getVelocityRatio()<< " \n";
     *logging::out << logging::Logger::INFO_HIGH << "viscosity real [m^2/s] = " << viscosityLB * para->getViscosityRatio() << "\n";
+    *logging::out << logging::Logger::INFO_HIGH << "dxGrid = " << dxGrid << "\n";
+    *logging::out << logging::Logger::INFO_HIGH << "useGridGenerator = " << useGridGenerator << "\n";
+    *logging::out << logging::Logger::INFO_HIGH << "useMultiGPU = " << useMultiGPU << "\n";
+    *logging::out << logging::Logger::INFO_HIGH << "useStreams = " << useStreams << "\n";
 
-    para->setTOut(10);
-    para->setTEnd(10);
+    
+    para->setTOut(10000);
+    para->setTEnd(10000);
 
     para->setCalcDragLift(false);
     para->setUseWale(false);
@@ -242,8 +247,8 @@ void multipleLevel(const std::string& configPath)
                 gridBuilder->setVelocityBoundaryCondition(SideType::PY, vxLB, 0.0, 0.0);  
             gridBuilder->setVelocityBoundaryCondition(SideType::GEOMETRY, 0.0, 0.0, 0.0);
             //////////////////////////////////////////////////////////////////////////
-
-            gridBuilder->findFluidNodes(useStreams);
+            if (useStreams)
+                gridBuilder->findFluidNodes(useStreams);
 
             //gridBuilder->writeGridsToVtk(path + "/" + bivalveType + "/grid/part" + std::to_string(generatePart) + "_");
             //gridBuilder->writeGridsToVtk(path + "/" + bivalveType + "/" + std::to_string(generatePart) + "/grid/");
@@ -272,8 +277,8 @@ void multipleLevel(const std::string& configPath)
 
             gridBuilder->setVelocityBoundaryCondition(SideType::GEOMETRY, 0.0, 0.0, 0.0);
             //////////////////////////////////////////////////////////////////////////
-
-            gridBuilder->findFluidNodes(useStreams);
+            if (useStreams)
+                gridBuilder->findFluidNodes(useStreams);
 
             // gridBuilder->writeGridsToVtk("E:/temp/MusselOyster/" + bivalveType + "/grid/");
             // gridBuilder->writeArrows ("E:/temp/MusselOyster/" + bivalveType + "/arrow");
diff --git a/apps/gpu/LBM/MusselOyster/configMusselOyster.txt b/apps/gpu/LBM/MusselOyster/configMusselOyster.txt
index f80b80469fade6f3e50841af1c47f4eba7e1e890..1cc65164170b72566efd7c09a86b4d712edc9a86 100644
--- a/apps/gpu/LBM/MusselOyster/configMusselOyster.txt
+++ b/apps/gpu/LBM/MusselOyster/configMusselOyster.txt
@@ -7,14 +7,14 @@
 ##################################################
 #informations for Writing
 ##################################################
-Path="E:/MusselOyster/results"
+Path=E:/temp/MusselOysterResults
 #Path="F:/Work/Computations/out/MusselOyster/"
 #Prefix="MusselOyster" 
 #WriteGrid=true
 ##################################################
 #informations for reading
 ##################################################
-GridPath="E:/temp/GridMussel/MUSSEL"
+GridPath=E:/temp/GridMussel/MUSSEL
 #GridPath="C:"
 
 ##################################################
diff --git a/src/gpu/VirtualFluids_GPU/Communication/Communicator.cpp b/src/gpu/VirtualFluids_GPU/Communication/Communicator.cpp
index 23fe11666d0608dfc763a156d10dce5a50427b75..80823e8c14bc54c7db75f36012b539c6d3f68a77 100644
--- a/src/gpu/VirtualFluids_GPU/Communication/Communicator.cpp
+++ b/src/gpu/VirtualFluids_GPU/Communication/Communicator.cpp
@@ -208,7 +208,7 @@ int Communicator::mapCudaDevice(const int &rank, const int &size, const std::vec
 std::vector<double> Communicator::gatherNUPS(double processNups)
 { 
     double *buffer_send = &processNups;
-    double *buffer_recv = buffer_recv = (double *)malloc(sizeof(double) * this->numprocs);
+    double *buffer_recv = (double *)malloc(sizeof(double) * this->numprocs);
 
     MPI_Gather(buffer_send, 1, MPI_DOUBLE, buffer_recv, 1, MPI_DOUBLE, 0, commGPU);
 
diff --git a/src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp b/src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp
index 4985ab81b16207fe57e4caff20e6fccb924807f7..06f436f3ae9ce351ad49978cf0ce482d467bf694 100644
--- a/src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp
+++ b/src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp
@@ -87,8 +87,10 @@ void Simulation::init(SPtr<Parameter> para, SPtr<GridProvider> gridProvider, std
 
    gridProvider->allocAndCopyForcing();
    gridProvider->allocAndCopyQuadricLimiters();
-   gridProvider->allocArrays_fluidNodeIndices();
-   gridProvider->allocArrays_fluidNodeIndicesBorder();
+   if (para->getUseStreams()) {
+	   gridProvider->allocArrays_fluidNodeIndices();
+	   gridProvider->allocArrays_fluidNodeIndicesBorder();
+   }
    gridProvider->setDimensions();
    gridProvider->setBoundingBox();