Tutorial 1: Getting Started

Tutorial 1. Part 2. 3-D flow simulation around the model. Video

In most cases you will be working in 3-D to accurately simulate the flow around the model of interest. All of the concepts learned in 2- D can be directly applied to 3-D grid generation. In this case a grid of the geometry in Part I will be created in 3-D.

What you will learn

Step 1. Creating Geometry

To aide in grid generation, GridPro has functions to create an assortment of surfaces such as planes and ellipses. GridPro also allows the user to import a geometry created in an external CAD package. In this case, a sphere surrounded by a box will be created. Go to the surf sub-menu on the Top Pull Down Menu and click on the -ellip button to pull up the Ellipse Dialog Box.

Step 2. Display Modes

Surfaces can be displayed as lines, points or in shaded mode. Other combinations such as shaded with hidden line removal are also available. Let’s remove some of the display clutter by turning the default setting from lines to points. Go to the STYLE sub-panel and left click on the center button to pull down the display menu and choose points.

Step 3. Introducing Macros

Macros are a powerful tool used to automate GridPro functions. Macros reduce tedious and repetitive tasks and significantly improve productivity. They can be edited and used to design topology and speed up the grid generation process. GridPro comes with pre-made macros written specifically to reduce the time for grid generation. Place a six surface box with topology around the sphere by going to the topo sub-menu and choosing the read MACRO option.

Step 4. Creating the Wrap

The same technique for creating the wrap in 2D of Part I will be used to create a 3D wrap around the sphere. Turn off the S button so the whole topology is displayed and, as in the 2D case, insert Edge Sheets around the sphere by pressing and holding down I on the keyboard and clicking on the topology edges. Put the first Edge Sheet at about 20% of the distance from the left most wall.

Step 5. Mesh Generation

As in Part I, go to the topo sub-menu and click on Ggrid:Start to begin the mesh generation process. Allow the mesh to run for a few minutes and load it up by going to the grid sub-menu to choose load new and click on the blk.tmp file.

Step 6. Introducing the Grid Viewer

One of the must useful tools inside GridPro is the Grid Viewer. GridPro incorporates the most advanced viewing technologies on the market. Go into the Grid Viewer panel and the blocks of the grid are displayed.