Computational Fluid Dynamics An Introduction：计算流体动力学导论.ppt

* CFD Process Viscous Model Boundary Conditions Initial Conditions Convergent Limit Contours Precisions (single/ double) Numerical Scheme Vectors Streamlines Verification Geometry Select Geometry Geometry Parameters Physics Mesh Solve Post-Processing Compressible ON/OFF Flow properties Unstructured (automatic/ manual) Steady/ Unsteady Forces Report (lift/drag, shear stress, etc) XY Plot Domain Shape and Size Heat Transfer ON/OFF Structured (automatic/ manual) Iterations/ Steps Validation Reports * Geometry Selection of an appropriate coordinate Determine the domain size and shape Any simplifications needed? What kinds of shapes needed to be used to best resolve the geometry? (lines, circular, ovals, etc.) For commercial code, geometry is usually created using commercial software (either separated from the commercial code itself, like Gambit, or combined together, like FlowLab) For research code, commercial software (e.g. Gridgen) is used. * Physics Flow conditions and fluid properties 1. Flow conditions: inviscid, viscous, laminar, or turbulent, etc. 2. Fluid properties: density, viscosity, and thermal conductivity, etc. 3. Flow conditions and properties usually presented in dimensional form in industrial commercial CFD software, whereas in non-dimensional variables for research codes. Selection of models: different models usually fixed by codes, options for user to choose Initial and Boundary Conditions: not fixed by codes, user needs specify them for different applications. * Mesh Meshes should be well designed to resolve important flow features which are dependent upon flow condition parameters (e.g., Re), such as the grid refinement inside the wall boundary layer Mesh can be generated by either commercial codes (Gridgen, Gambit, etc.) or research code (using algebraic vs. PDE based, conformal mapping, etc.) The mesh, together with the boundary conditions need to be exported from commerci