Creating Two Coils with Different Axes on Comsol 3.5

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SUMMARY

This discussion focuses on creating two coils with different axes in COMSOL Multiphysics 3.5, where the user initially attempts to use the 2D axisymmetric mode, which restricts coil alignment to a single axis. The solution proposed involves switching to a full 3D simulation to accommodate separate central axes for each coil. Additionally, the user addresses challenges related to drag force calculations in a cube geometry, specifically how to mitigate the influence of the cube's walls on drag measurements as the sphere approaches the center.

PREREQUISITES
  • Familiarity with COMSOL Multiphysics 3.5
  • Understanding of 3D simulation techniques
  • Knowledge of fluid dynamics, particularly low Reynolds number flow
  • Experience with boundary condition settings in computational simulations
NEXT STEPS
  • Research how to set up 3D simulations in COMSOL Multiphysics
  • Learn about implementing boundary conditions for infinite domain approximations in fluid dynamics
  • Explore drag force calculations in COMSOL for complex geometries
  • Investigate the effects of wall proximity on fluid flow behavior in simulations
USEFUL FOR

This discussion is beneficial for engineers and researchers working with COMSOL Multiphysics, particularly those involved in fluid dynamics simulations, coil design, and computational modeling of complex geometries.

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

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