comsol help

dimanche 13 juillet 2014

hello everyone

is anybody here using comsol multiphysics?

i'm trying to model a tube which the inlet is a fully developed fluid

but the problem is how to enter a parabolic inlet profile for velocity

in 2d axisymmetric it is very simple. but my model is 3d

i've entered "r" as a variable in definitions{r=sqrt((x^2)+(y^2))} and another variable for velocity, using "r". but the solution is not converged

how can i give the correct parabolic inlet?





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