diff --git a/intern/elbeem/intern/solver_class.h b/intern/elbeem/intern/solver_class.h
index 1548aaa19bc..1962e801a4e 100644
--- a/intern/elbeem/intern/solver_class.h
+++ b/intern/elbeem/intern/solver_class.h
@@ -765,19 +765,19 @@ class LbmFsgrSolver :
 
 // lbm testsolver get index define, note - ignores is (set) as flag
 // array is only a single entry
-#define _LBMGI(level, ii,ij,ik, is) ( (mLevel[level].lOffsy*(ik)) + (mLevel[level].lOffsx*(ij)) + (ii) )
+#define _LBMGI(level, ii,ij,ik, is) ( (LONGINT)((LONGINT)mLevel[level].lOffsy*(LONGINT)(ik)) + ((LONGINT)mLevel[level].lOffsx*(LONGINT)(ij)) + (LONGINT)(ii) )
 
 //! flag array acces macro
-#define _RFLAG(level,xx,yy,zz,set) mLevel[level].mprsFlags[set][ LBMGI((level),(xx),(yy),(zz),(set)) ]
-#define _RFLAG_NB(level,xx,yy,zz,set, dir) mLevel[level].mprsFlags[set][ LBMGI((level),(xx)+this->dfVecX[dir],(yy)+this->dfVecY[dir],(zz)+this->dfVecZ[dir],set) ]
-#define _RFLAG_NBINV(level,xx,yy,zz,set, dir) mLevel[level].mprsFlags[set][ LBMGI((level),(xx)+this->dfVecX[this->dfInv[dir]],(yy)+this->dfVecY[this->dfInv[dir]],(zz)+this->dfVecZ[this->dfInv[dir]],set) ]
+#define _RFLAG(level,xx,yy,zz,set) mLevel[level].mprsFlags[set][ (LONGINT)LBMGI((level),(xx),(yy),(zz),(set)) ]
+#define _RFLAG_NB(level,xx,yy,zz,set, dir) mLevel[level].mprsFlags[set][ (LONGINT)LBMGI((level),(xx)+this->dfVecX[dir],(yy)+this->dfVecY[dir],(zz)+this->dfVecZ[dir],set) ]
+#define _RFLAG_NBINV(level,xx,yy,zz,set, dir) mLevel[level].mprsFlags[set][ (LONGINT)LBMGI((level),(xx)+this->dfVecX[this->dfInv[dir]],(yy)+this->dfVecY[this->dfInv[dir]],(zz)+this->dfVecZ[this->dfInv[dir]],set) ]
 
 // array handling  -----------------------------------------------------------------------------------------------
 
-#define _LBMQI(level, ii,ij,ik, is, lunused) ( (mLevel[level].lOffsy*(ik)) + (mLevel[level].lOffsx*(ij)) + (ii) )
-#define _QCELL(level,xx,yy,zz,set,l) (mLevel[level].mprsCells[(set)][ LBMQI((level),(xx),(yy),(zz),(set), l)*dTotalNum +(l)])
-#define _QCELL_NB(level,xx,yy,zz,set, dir,l) (mLevel[level].mprsCells[(set)][ LBMQI((level),(xx)+this->dfVecX[dir],(yy)+this->dfVecY[dir],(zz)+this->dfVecZ[dir],set, l)*dTotalNum +(l)])
-#define _QCELL_NBINV(level,xx,yy,zz,set, dir,l) (mLevel[level].mprsCells[(set)][ LBMQI((level),(xx)+this->dfVecX[this->dfInv[dir]],(yy)+this->dfVecY[this->dfInv[dir]],(zz)+this->dfVecZ[this->dfInv[dir]],set, l)*dTotalNum +(l)])
+#define _LBMQI(level, ii,ij,ik, is, lunused) ( (LONGINT)((LONGINT)mLevel[level].lOffsy*(LONGINT)(ik)) + (LONGINT)((LONGINT)mLevel[level].lOffsx*(LONGINT)(ij)) + (LONGINT)(ii) )
+#define _QCELL(level,xx,yy,zz,set,l) (mLevel[level].mprsCells[(set)][ (LONGINT)LBMQI((level),(xx),(yy),(zz),(set), l)*(LONGINT)dTotalNum +(LONGINT)(l)])
+#define _QCELL_NB(level,xx,yy,zz,set, dir,l) (mLevel[level].mprsCells[(set)][ (LONGINT)LBMQI((level),(xx)+this->dfVecX[dir],(yy)+this->dfVecY[dir],(zz)+this->dfVecZ[dir],set, l)*dTotalNum +(l)])
+#define _QCELL_NBINV(level,xx,yy,zz,set, dir,l) (mLevel[level].mprsCells[(set)][ (LONGINT)LBMQI((level),(xx)+this->dfVecX[this->dfInv[dir]],(yy)+this->dfVecY[this->dfInv[dir]],(zz)+this->dfVecZ[this->dfInv[dir]],set, l)*dTotalNum +(l)])
 
 #define QCELLSTEP dTotalNum
 #define _RACPNT(level, ii,ij,ik, is )  &QCELL(level,ii,ij,ik,is,0)
diff --git a/intern/elbeem/intern/solver_init.cpp b/intern/elbeem/intern/solver_init.cpp
index aede617a4d3..63ce1570eea 100644
--- a/intern/elbeem/intern/solver_init.cpp
+++ b/intern/elbeem/intern/solver_init.cpp
@@ -817,16 +817,16 @@ bool LbmFsgrSolver::initializeSolverMemory()
 	mLevel[ mMaxRefine ].nodeSize = ((mvGeoEnd[0]-mvGeoStart[0]) / (LbmFloat)(mSizex));
 	mLevel[ mMaxRefine ].simCellSize = mpParam->getCellSize();
 	mLevel[ mMaxRefine ].lcellfactor = 1.0;
-	LONGINT rcellSize = ((mLevel[mMaxRefine].lSizex*mLevel[mMaxRefine].lSizey*mLevel[mMaxRefine].lSizez) *dTotalNum);
+	LONGINT rcellSize = (LONGINT)((LONGINT)((LONGINT)mLevel[mMaxRefine].lSizex*(LONGINT)mLevel[mMaxRefine].lSizey*(LONGINT)mLevel[mMaxRefine].lSizez) * (LONGINT)dTotalNum);
 
 #if COMPRESSGRIDS==0
 	mLevel[ mMaxRefine ].mprsCells[0] = new LbmFloat[ rcellSize +4 ];
 	mLevel[ mMaxRefine ].mprsCells[1] = new LbmFloat[ rcellSize +4 ];
 	ownMemCheck += 2 * sizeof(LbmFloat) * (rcellSize+4);
 #else // COMPRESSGRIDS==0
-	LONGINT compressOffset = (mLevel[mMaxRefine].lSizex*mLevel[mMaxRefine].lSizey*dTotalNum*2);
-	// D int tmp = ( (rcellSize +compressOffset +4)/(1024*1024) )*4;
-	// D printf("Debug MEMMMM excee: %d\n", tmp);
+	LONGINT compressOffset = (LONGINT)((LONGINT)mLevel[mMaxRefine].lSizex * (LONGINT)mLevel[mMaxRefine].lSizey * (LONGINT)dTotalNum * 2);
+	// LONGINT tmp = ( (rcellSize +compressOffset +4)/(1024*1024) )*sizeof(LbmFloat);
+	// printf("Debug MEMMMM excee: %I64d, %I64d, %I64d, %d, %d\n", tmp, compressOffset, rcellSize, mLevel[mMaxRefine].lSizex, mLevel[mMaxRefine].lSizey );
 	mLevel[ mMaxRefine ].mprsCells[1] = new LbmFloat[ rcellSize +compressOffset +4 ];
 	mLevel[ mMaxRefine ].mprsCells[0] = mLevel[ mMaxRefine ].mprsCells[1]+compressOffset;
 	ownMemCheck += sizeof(LbmFloat) * (rcellSize +compressOffset +4);