Modelling with Comsol

[FunWarrior]

Hi,

I am trying to create two coils with different axes on Comsol Multiphysics 3.5. I use the 2D axisymetric mode but it allows to create only coils with the same axe.

Can somebody help me ?

Thanks in advance.

[NeoDevin]

If you need the two coils to be on separate central axes, then you'll have to use a full 3D simulation.

[cathalcummins]

I'm modelling low Re flow of liquid past a sphere close to a sliding wall with COMSOL. I'm trying to extract the drag dependence on distance from the wall.

Problem: The other walls of cube are causing noticeable effects on drag (even though Cube length = O(10*r)) as I get closer to the centre of the cube. I have an inlet on the top of the cube, an outlet on the bottom and the other four walls are sliding with unit velocity -- there is no slip on the surface of the sphere.

Question: Does anyone have any ideas how to trick COMSOL into believing there's an infinite domain? I was thinking about maybe some sort of "no viscous forces" boundary on the three other walls or something; any thoughts?

Cheers,