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Flow vector from a 3D solution into 2D

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Hello,

I have the following problem: I have a 3D simulation of a gas flow in Comsol 5.0. Now I want to add some heating effects, but as the geometry is cylindrical, a 2D axial symmetric model will do as well. How can I incorporate the resulting 3D flow solution (translated into cylindrical coordinates) into another study in 2D? I tried the "extrude" option, but I could not figure it out.

Thanks a lot!

George

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