# grid generation help

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 November 12, 1999, 18:22 grid generation help #1 zhe zhang Guest   Posts: n/a hello, everyone: My research work is to generate the grid used for computation for a flow over the propellor. But I never did the work about the grid generation although I complete some computational work before. I don't know where can I start and what paper should I read at first. Can people who has the experience on the grid generation give me any suggestions? Thank you very much.

 November 12, 1999, 19:34 Re: grid generation help #2 Joern Beilke Guest   Posts: n/a Have a look at http://www.cle.de/cfd/index.html GridPro is able to create high quality hex-meshes and works very good for propeller-like cases. Watching the pictures might give you a good impression for starting )

 November 12, 1999, 23:48 Re: grid generation help #3 John Chien Guest   Posts: n/a (1). You can visit the resources section, there are many websites on grid generation. (2). First of all, you need to take a look at a real propeller. There are propellers for aircrafts, for ships, for small boat,..., you must know what you are going to work on. (3). Once you have passed this step, you can use a cylindrical coordinates fixed to the propeller, and make many constant radius cut through the blade to give you the cross-sectional shape. That will be the propeller blade geometry shape definition. This blade surface and mesh will be rotating with the rotating system. (4). On any cylindrical surface, it is basically 2-D on curved surface. You can define the upstream inlet station, and the downstream exit station. In between, there is your blade section. Depending on the number of blades, you can define the extent of your periodic boundary. (5). It is easier to work on this problem with a 2-D problem, that is the flow over an airfoil. Once you have learned how to deal with the 2-D problem and mesh generation, you can easily extend it in the third dimension (the radial direction). (6). The mesh for 2-D problem can be H-grid, C-grid, O-grid, unstructured grid, and it can be extended to 3-D. (7). It is easier to review the AIAA Journals, and study the various meshes used for airfoil calculation. I think you also would like to know how to define the airfoil section.

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