diff --git a/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.cpp b/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.cpp
index da66b8c2..93583714 100644
--- a/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.cpp
+++ b/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.cpp
@@ -60,16 +60,26 @@ bool pFlow::MPISimulationDomain::createBoundaryDicts()
 			"in dictionary "<< boundaries.globalName()<<endl;
 			return false;
 		}
-
-		if( neighbors[i] == -1 )
+        if( initialThisDomainActive() )
         {
-            bDict.add("mirrorProcessorNo", processors::globalRank());
+            if( neighbors[i] == -1 )
+            {
+                bDict.add("mirrorProcessorNo", processors::globalRank());
+            }
+            else
+            {
+                bDict.add("mirrorProcessorNo", neighbors[i]);
+                bDict.addOrReplace("type", "processor");
+            }
+            warningInFunction<<"replace the method initialThisDomainActive()"<<endl;
         }
         else
         {
-            bDict.add("mirrorProcessorNo", neighbors[i]);
-            bDict.addOrReplace("type", "processor");
+            bDict.add("mirrorProcessorNo", processors::globalRank());
+            bDict.addOrReplace("type", "none");
+            warningInFunction<<"None: replace the method initialThisDomainActive()"<<endl;
         }
+		
 	}
 
     return true;
@@ -229,7 +239,12 @@ pFlow::uint32 pFlow::MPISimulationDomain::initialNumberInThis() const
 {
     uint32 numImport = domainPartition_->numberImportThisProc();
     uint32 numExport = domainPartition_->numberExportThisProc();
-    return initialNumPoints_+ numImport - numExport;;
+    return max(initialNumPoints_+ numImport - numExport, 0u);
+}
+
+bool pFlow::MPISimulationDomain::initialThisDomainActive() const
+{
+    return initialNumberInThis()>0;
 }
 
 bool pFlow::MPISimulationDomain::initialTransferBlockData
diff --git a/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.hpp b/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.hpp
index b47a9201..feef591c 100644
--- a/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.hpp
+++ b/src/phasicFlow/MPIParallelization/domain/MPISimulationDomain.hpp
@@ -70,11 +70,14 @@ public:
     /// @param pointPos 
     /// @return 
     bool initialUpdateDomains(span<realx3> pointPos)override;
+    
 
     /// @brief 
     /// @return 
     uint32 initialNumberInThis()const override;
 
+    bool initialThisDomainActive()const override;
+
     bool initialTransferBlockData(
 		span<char> src, 
 		span<char> dst,
diff --git a/src/phasicFlow/MPIParallelization/rcb1DPartitioning.cpp b/src/phasicFlow/MPIParallelization/rcb1DPartitioning.cpp
index 3a22ae1f..c2345ab6 100644
--- a/src/phasicFlow/MPIParallelization/rcb1DPartitioning.cpp
+++ b/src/phasicFlow/MPIParallelization/rcb1DPartitioning.cpp
@@ -97,6 +97,12 @@ bool pFlow::rcb1DPartitioning::partition(pointCollection &points)
 
   	localBox_ = globalBox_;
 
+    if(equal(x0, x1))
+    {
+        x0 = x0 - 0.00001;
+        x1 = x1 + 0.00001;
+    }
+
     switch (direction_)
     {
     case Direction::X :
diff --git a/src/phasicFlow/MPIParallelization/rcb1DPartitioning.hpp b/src/phasicFlow/MPIParallelization/rcb1DPartitioning.hpp
index ad5f7693..b58532e3 100644
--- a/src/phasicFlow/MPIParallelization/rcb1DPartitioning.hpp
+++ b/src/phasicFlow/MPIParallelization/rcb1DPartitioning.hpp
@@ -60,9 +60,8 @@ public:
 		const dictionary& dict, 
 		const box& globalBox);
 	
-	
-	virtual 
-	~rcb1DPartitioning()=default;
+
+	~rcb1DPartitioning() override=default;
 
     span<int32> exportList(int procNo)const override
     {