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1、mIn this session: mGridgen Terminology. mGUI Components. mGridgen Help. mBuilding 2D Structured Grids. mBuilding 2D Unstructured Grids. mTutorial: “2D Bump: Basic Skills.” GridgenTraining Overview 1 Whats an Entity? An entity is any individual element that makes up part of a grid or geometry. Gridge
2、n Terminology DomainsBlocksConnectors Examples of Gridgen entities 2 Connectors Gridgen Terminology Connectors are the curve entities that define all grid edges. Connectors contain one or more segments. Nodes mark connector endpoints. Control Points let user define segment shape. Connectors are dime
3、nsioned by number of grid points with a distribution describing how they are placed. 3 Domains Gridgen Terminology A Domain is a surface grid entity bounded by edges. Structured Domains consist solely of quadrilateral elements. Unstructured Domains consist solely of triangular elements. Structured D
4、omains have exactly four edges. Unstructured Domains generally have one edge (more if they the encompass holes). Each edge contains one or more connector(s). 4 Blocks Gridgen Terminology A Block is a volume grid entity bounded by faces. Structured Blocks consist solely of hexahedral elements. Unstru
5、ctured Blocks can consist of tetrahedral, pyramidal, and/or prismatic elements. Structured Blocks are bounded by exactly six faces. Unstructured Blocks generally have one face (more if they encompass holes). Each face contains one or more domain(s). 5 Grids A Grid is composed of volume and/or surfac
6、e grid blocks. Structured Grids contain only quadrilateral and hexahedral elements. Unstructured Grids contain only triangular and tetrahedral elements. Hybrid Grids (such as that shown here) contain both structured and unstructured grid elements (quads, triangles, hexes, and tets) and can also have
7、 prismatic and pyramidal elements. Gridgen Terminology 6 Databases mIn Gridgen, databases refer to collections of geometry information that can be used to define the shape to which the grid is to be built and typically come from computer aided design (CAD) software: mAnalytic curve and surface infor
8、mation from a CAD file. mShell discrete unstructured database surface entity, generally imported from stereolithography (STL) formatted files. mNetwork bilinear (non-slope continuous) database surface entity, generally imported from Plot3D formatted files. mOf course, databases are not necessary to
9、build grids with Gridgen, but are often needed for importing complex geometries. Gridgen Terminology 7 The Gridgen Screen GUI Components Version Lists Gridgen version number Status Tallies number of grid entities Message Provides instructions and prompts for text input Text Input Echoes data entered
10、 via keyboard Blackboard Displays context-sensitive graphical and tabular data (aka Diagnostic or Browser window) Command Menu Lists Gridgen Commands (aka Button Menu) Display Shows graphical image of grid and database 8 The Mouse: Pan, Zoom, and Pick Left Mouse Button: Pan Press and hold the left m
11、ouse button to pan the model image in the display window. While panning, the mouse cursor changes to: Center Mouse Button: Zoom Press and hold the center mouse button to change the model images size, pushing the mouse away from you zooms out while pulling it towards you zooms in. For mice with a cen
12、ter wheel, the wheel can be rolled or held down to control zoom. On two button mice, zooming is accomplished by holding both buttons down. While zooming, the mouse cursor changes to: Right Mouse Button: Pick Press and release the right mouse button to select commands from the command menu or pick en
13、tities in the display window or browser list. While picking, the mouse cursor changes to: GUI Components 9 Some Mouse Options GUI Components The functions of the left and right mouse buttons can be reversed, so that left is for picking and right is for panning. This can be done by selecting LeftPk.
14、When dealing with smaller geometric entities, it may also be desirable to reduce the mouse sensitivity in panning, zooming, and rotating the screen image. This can be done by clicking on the button (more clicks, less sensitivity). You may wish to change some of the default mouse settings. These can
15、be accessed by selecting the Display or Disp submenu from Gridgens MAIN MENU. 10 Model Rotations Y X Z Screen Coordinates Body Coordinates GUI Components mGridgen has two distinct coordinate systems: screen coordinates and body coordinates. mIn addition to panning, zooming, and picking, the mouse bu
16、ttons can also be used to rotate the model screen image. This is done by combining the left and center mouse buttons with the Ctrl key: mCtrl + left mouse button: screen x and y rotations. mCtrl + center mouse button: screen z rotations. 11 Model Rotations (Continued) mFor more precise rotation control, the following numpad keys can be used: m7 rotates about the x screen axis. m8 rotates about the y screen axis. m9 rotates about the z screen axis. mNum
