# model dimension: 10-100 mikrometers

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 September 28, 2001, 06:01 model dimension: 10-100 mikrometers #1 LEGO Guest   Posts: n/a Hello! I would like to get some help on my new work. I going to calculate convective heat transfer at a surface of a CHIP. The geometry is complicated and has an about 10-100 mikrometer of dimension. The medium is air, it cools the surface. The velocity far away from the surface is some cm/s. We need the detailed temperature and velocity fields. I would like to get some advices or publications on meshing and the wall treatments. Till now I dealed with problems of great geometries. Thanks for your help: Gabor LEGRADI, Budapest University of Technology

 September 28, 2001, 14:35 Re: model dimension: 10-100 mikrometers #2 John C. Chien Guest   Posts: n/a (1). When you do CFD simulation, you need to know the Reynolds number of your problem. It looks like that the Reynolds number of your problem is relatively low. (2). It is good from numerical analysis point of view. Perhaps, you don't have to worry about the turbulence modeling right from the begining. You can treat the problem as a laminar flow problem. (3). For the complex geometry, you can try to use Cartesian grid approach with approximation to the real geometry, if the geometry is mainly straight lines and flat surfaces.

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