# HELP!

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 December 19, 1998, 05:16 HELP! #1 a CFD student Guest   Posts: n/a I am a begineer in CFD. Currently, I am trying to use the SIMPLE's method to do the calculation of a flow past a sphere. Could somebody kindly tell me where I can get(download) the corresponding free codes written in Fortran? Another problem I am considering to solve is like this: a flow passes a sphere while the computational domain is a hexahedron with slip boundary. How can I handle this problem? It seems I have to use two different coordinate(Cartesian and spherical) system to do the calculation, am I right? Is there any mesh generator which is straightforward to use for this problem? By the way, I only have some knowledge and experience on FD and FV, mainly on FD. Some people told me FEM is more appropriate for this problem but I would like to use the method I am more familiar with. Thanks a lot in advance!

 December 21, 1998, 10:02 Re: HELP! #2 x Guest   Posts: n/a xx

 December 21, 1998, 13:00 Re: HELP! #3 John C. Chien Guest   Posts: n/a I don't know where to find a SIMPLE code which can handle the general coordinate transformation. If can visulize the sphere as if it is a cube, then you can use H-type mesh to cover the flow field. In the case of O-type mesh, you can transform the outer boundary into a cube ( or rectangular shape. This type could be a better choice, if you are mainly interested in the flow near the surface of the sphere. The adaptive unstructured mesh would be ideal for the whole flow field. Regardless of what you used, as long as you have enough mesh points to cover the high gradient flow region, the selectionof mesh type is not a critical issue. Especially, if you are computing unsteady wake flow, your mesh also need to follow it ( or use a very fine mesh).