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Uniform 2d Magnetic Field
Posted Oct 4, 2013, 9:32 a.m. EDT Low-Frequency Electromagnetics, Geometry Version 4.3b 1 Reply
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Hello,
I am trying to model the magnetic field around a pipeline in which an electric current flows. I want there to be a uniform magnetic field in the background in the y direction, if the pipeline and it's current are in the z direction.
I can get a nearly uniform field by drawing an air filled square around the cylinder and defining a magnetic field on the left and right boundaries (H0 in y dirn, so B.C. n x H = n1 x H1 are on L and R), and I have magnetic insulation on the top and bottom (Im working in 2D).
If i make the square large this approximates a uniform field around the region of the pipe in the centre but is there a way to improve this and have a perfectly uniform field? Please see the attached file made with COMSOL 4.3b if my description was not clear.
I am trying to model the magnetic field around a pipeline in which an electric current flows. I want there to be a uniform magnetic field in the background in the y direction, if the pipeline and it's current are in the z direction.
I can get a nearly uniform field by drawing an air filled square around the cylinder and defining a magnetic field on the left and right boundaries (H0 in y dirn, so B.C. n x H = n1 x H1 are on L and R), and I have magnetic insulation on the top and bottom (Im working in 2D).
If i make the square large this approximates a uniform field around the region of the pipe in the centre but is there a way to improve this and have a perfectly uniform field? Please see the attached file made with COMSOL 4.3b if my description was not clear.
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1 Reply Last Post Oct 7, 2013, 2:50 a.m. EDT
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Posted:
1 decade ago
Hi,
for a uniform flux density at the surface you can use boundary condition on the
vector potential like
Az = -Bexty*x
e.g. a as "Pointwise Constraint". This setting simulates a homogeneous flux
density in the the outside world.
Maybe this is already what you need.
Regards
Jens
for a uniform flux density at the surface you can use boundary condition on the
vector potential like
Az = -Bexty*x
e.g. a as "Pointwise Constraint". This setting simulates a homogeneous flux
density in the the outside world.
Maybe this is already what you need.
Regards
Jens