Transcription of Lecture 7 - Meshing Applied Computational Fluid …
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Lecture 7 - Meshing Applied Computational Fluid …
1 Lecture 7 - MeshingApplied Computational Fluid DynamicsInstructor: Andr Andr Bakker (2002-2006) Fluent Inc. (2002)2 Outline Why is a grid needed? Element types. Grid types. Grid design guidelines. Geometry. Solution adaption. Grid is a grid needed? The grid: Designates the cells or elements on which the flow is solved. Is a discrete representation of the geometry of the problem. Has cells grouped into boundary zones where s are Applied . The grid has a significant impact on: Rate of convergence (or even lack of convergence). Solution accuracy. CPU time required. Importance of mesh quality for good solutions . Grid density. Adjacent cell length/volume ratios. Skewness. Tet vs. hex. Boundary layer mesh. Mesh refinement through can be very or more complexgeometry for a cube Geometry The starting point for all problems is a geometry. The geometry describes the shape of the problem to be analyzed. Can consist of volumes, faces (surfaces), edges (curves) and vertices (points).
2 Outline • Why is a grid needed? • Element types. • Grid types. • Grid design guidelines. • Geometry. • Solution adaption. • Grid import.
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