AN EFFICIENT HYBRID GRID SCHEME FOR CALCULATION OF VISCOUS FLOWS

A HYBRID GRID SCHEME WHICH UTILIZES AUTOMATICALLY GENERATED STRUCTURED MESHES GLUED TOGETHER BY UNSTRUCTURED MESHES IS PROPOSED FOR DEVELOPMENT. THE HYBRID METHOD PROMISES TO COMBINE THE EASE AND LOW MAN-HOUR REQUIREMENT FOR THE GENERATION OF UNSTRUCTURED MESHES WITH THE EFFICIENCY OF THE VISCOUS FLOW SOLVER ON STRUCTURED MESHES. THUS THE HYBRID SCHEME WILL COMBINE THE ADVANTAGES OF THE TWO IHESHES WITH MINIMAL DEGREDATION IN PERFORMANCE. WE PROPOSE THE DEVELOPMENT OF AN EFFICIENT HYBRID GRID SCHEME FOR USE IN OBTAINING VISCOUS CFD SOLUTIONS. THE GOAL IS TO DEVELOP A BALANCED SET OF GRID GENERATION AND FLOW SOLVER CODES WHICH WILL REDUCE THE PERSON HOURS REQUIRED TO GENERATE THE GRID WITH ONLY A MODEST INCREASE IN COMPUTER E)CECUTION TIMES FOR THE FLOW SOLVER. THE PROPOSED APPROACH IS TO GENERATE STRUCTURED GRIDS NEAR THE SURFACE OF THE GEOMETRY AND USE UNTRUCTURED GRIDS TO GLUE THESE STRUCTURED GRIDS TOGETHER. THIS APPROACH WILL ALLOW THE FLOW SOLVER TO E)CECUTE AT OPTIMAL EFFICIENCY ON THE STRUCTURED PORTION OF THE GRID. THE HYBRID GRID CAN BE GENERATED IN AN AUTOMATED FASHION WITHOUT REQUIRING SIGNIFICANT USER EXPERTISE OR TIME. THIS WILL ALLOW THE CFD ANALYSIS CAPABILITY TO BE PLACED IN THE HANDS OF ENGINEERS WITHOUT REQUIRING THEM TO BE CFD EXPERTS .