# mesh in gambit

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 February 11, 2003, 11:39 mesh in gambit #1 Jack Guest   Posts: n/a if we put a small object such as plane in to a big wind tunnel(3D), how can we mesh it so that the mesh around the plane is very dense and becomes coarser and coarser to the wall of wind tunnel. thanks!

 February 11, 2003, 14:27 Re: mesh in gambit #2 Marc Guest   Posts: n/a You probably don't want to use tetrahedrons. I would use a C-Grid, which is wrapped around the tip of the plane. Then you have the possibilies to change the density normal to the plane's surface. Also, because of the diverging element edges, you will not get too bad aspect ratios. Was it possible to understand this? Hope I did not confuse you. Greetings, Marc

 February 11, 2003, 21:51 Re: mesh in gambit #3 Jack Guest   Posts: n/a hi, marc, thanks for your response. I am still not very clear about how to mesh this 3D problem. what I did is like this. 1 creat the plane (volume 1 ) 2 creat the wind tunnel (Volume 2) 3 Subtract V1 from V2 4 Mesh plane's surfaces 5 mesh volume 2 but it turns out not the one I want. I want the grids around the plane refined, but it seems all the grids are uniform. I think it has nothing to do with the Shape of the grid. it has to be something with the mesh method. thanks! Jack

 February 12, 2003, 07:27 Re: mesh in gambit #4 Marc Guest   Posts: n/a Dear Jack, I am not a Gambit user, so maybe I got your question wrong. Do you like to mesh with tetraherdrons or hexaherdrons? If you want to create a hex mesh, one volume will not be enought. You will have to divide the region around the plane into so called blocks (which are each hexaherdrons) and then create a block struktured c-grid. Maybe there is another way in Gambit, which I don't know. Meshing with tetrahedrons will be much easier. Mesh the plane, as fine as you like (surface mesh - 2D) , then mesh the outer surface (wind tunnel) much coarser (also 2D). The 3D fluid mesh should then grow from inside (fine) to outside (coarse). Did that help? Greetings, Marc

 February 12, 2003, 10:47 Re: mesh in gambit #5 ff Guest   Posts: n/a Dear Jack, Look in gambit UM for "size functions". This will solve your problem. Regards, ff

 March 4, 2003, 07:40 Re: mesh in gambit #6 Mitja Guest   Posts: n/a I've got the same problem as Jack. I want mesh the Ahmed model in Gambit and I have meshed some extra edges that I have first created on the faces model, in order to refine the grid in particular zones, and second I have mesh the volume ( result of substracting the model from a bigger brick ) but the grid doesn't seem to be refined around the model as I wanted. How can I solve my problem? Have you alredy found the answer Jack?

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