Gambit 中建立几何模型的方法.pptVIP

Creating Geometry in GAMBIT Outline Preliminaries General operations Real (ACIS) geometry Bottom-up creation tools Top-down creation tools Face Primitives Volume Primitives Boolean and Split Operations Preliminaries-1 Objective: Create and mesh the fluid region for flow problems and solid regions for heat transfer (and structrual analysis for Fidap Users). Typically accomplished by constructing and working with lower order entity objects and volume primitives. Terminology: Vertex - a point Edge - a curve that is defined by at least 2 vertices Face - a surface (not necessarily planar) bounded by at least 1 edge (in the case of 1 edge, the edge forms a loop) Volume - a geometric solid (as in a solids model), also can be thought of as an “air tight” set of bounding faces. Preliminaries-2 Identification: Standalone entities assume following color scheme: Vertex (white), Edge (yellow), Face (light blue), Volume (green), Group (dark green) When an entity is connected, it is taking the highest (dimensionally) entity color Undo/Redo: 10 levels of undo by default. Undoes geometry, meshing, and zoning commands. Description window provides command to be undone when mouse is passed over undo button. Left click to execute visible button operation. Right click to access options. General Operations: Coordinate System Coordinate system Located on the “Tool menu bar” Creation methods Cartesian, Cylindrical and Spherical systems Using Offset/Angle or Vertices for location/orientation “Active” coordinate system is default in all forms Grid creation with “snapping” of vertices -Recommended for simple geometries only Creation of rulers General Operations: Move/Copy Move/Copy Operations: Translate: Reflect: General Operations: Vector Definition Form Vector Definition form Accessible from: Rotate and Reflect (in Move/Copy) Sweep and Revolve (in Face/Volume Create) View Face/Vector Methods: Coordinate system axis: Uses