## COMSOL help

Hi everybody, newbie here...

im doing a modelling work with comsol and have a problem of solving using navier-stoke equation for the boundary. is it possible to discretize the boundary condition into several parts and apply different condition in each segment?

thank you beforehand,

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 Recognitions: Gold Member Science Advisor Hi gganendra, yes - that is possible. Probably the easiest way is to do it like you described, divide the (original) boundary to multiple new boundaries and apply different conditions to each new segment. Alternatively, in Comsol you can define the boundary condition as a function of coordinates along the boundary (you can use either a global coordinate system, or then a local coordinate system going along the boundary) which gives you freedom to define pretty much whatever kind of bcs you desire (non-piece-wise mean).
 oh so it is possible....because in comsol script (i prefer script rather than multiphysics, it gives more freedom), each boundary is given an indices (fem.bnd.ind field), and each indices apply to each line (2d, or face, 3d) for example in a rectangular geometry and i cant divide the line to several parts okay then i will try the coordinate system... thank you

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