I am studying some microfluidic flow problem. When I'm doing the analytical work, I can often simplify the problem under the assumption that one spatial coordinate is much smaller than the other one (say H/L<<1 where H is typical vertical scale, and L is typical horizontal scale). Now I want to study the problem without any approximation in COMSOL using the Laminar two-phase flow module , but it is still true that L is quite larger than H. The problem is that the geometry of the problem becomes very wide (width is usually more than 10x the height) while the actual variation rate in the horizontal direction looks quite small compared to the vertical direction, and I have a feeling that I'm using a lot more mesh elements (and time) without actually improving the simulation. Is it possible to scale the two spatial coordinates differently to make the size and typical variation in both dimenions comparable? (say x->x/10um, y->y/0.5um)
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