New Gradient Calculation Method for MUSCL Type CFD Schemes in Arbitrary Polyhedra

摘要: The gradient calculation in the reconstruction phase is key for spatial accuracy and robustness of MUSCL type CFD schemes. For calculation, which bears central role second order reconstruction, new method arbitrary polyhedra based on WLSQ (weighted least square) merging benefit G-G (Green-Gauss) presented. method, named GLSQ (G-G WLSQ), has non-orthogonal non-uniform linear mesh gives rigorous thin curved LSQ shows huge error. A geometrical monotonicity condition, should satisfy robustness, also introduced. Although originally developed hybrid meshes that combines octree layered meshes, it shown numerically better usual rectangle triangle meshes.