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A very, very simple problem, little help: calculating magnetic field due to two intensity spots.
Posted May 11, 2011, 11:27 a.m. EDT Low-Frequency Electromagnetics Version 4.1 2 Replies
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Hello everybody:
I have just bought COMSOL 4.1 with AC/DC Module.
To start to interact with the software, I would like to solve the following problem:
I would like to calculate the magnetic field (B oder H) in the air due to two intensities in a 2D plane.
1) To do this I have chosen as MODEL WIZARD a 2D axisymmetric as space dimension.
2) As GEOMETRY, I have a square with air and inside two points located near the central axis (r=0) and I want to set these two points with two different intensity values (in Ampères,[A]).
3) As MATERIALS, I have used air inside this square.
4) As PHYSICS, I have used the "Magnetic and Electric fields (mef) model".
Now, I need to put the values of these two intensity points and later the boundary values on the square's sides except the one that is located on the axi simmetry (r=0). But I don't have ide how to manage it.
|-----------------------------------------
| |
| |
| |
| |
| * * |
| |
| |
| |
| |
|_______________________|
(r=0)
Above it is represented my domain with the two points of intensity described by *.
Could someone help me, please?
I would be really grateful.
Thanks in advance.
I am looking forward to hearing from you.
Best regards,
Isabel.
I have just bought COMSOL 4.1 with AC/DC Module.
To start to interact with the software, I would like to solve the following problem:
I would like to calculate the magnetic field (B oder H) in the air due to two intensities in a 2D plane.
1) To do this I have chosen as MODEL WIZARD a 2D axisymmetric as space dimension.
2) As GEOMETRY, I have a square with air and inside two points located near the central axis (r=0) and I want to set these two points with two different intensity values (in Ampères,[A]).
3) As MATERIALS, I have used air inside this square.
4) As PHYSICS, I have used the "Magnetic and Electric fields (mef) model".
Now, I need to put the values of these two intensity points and later the boundary values on the square's sides except the one that is located on the axi simmetry (r=0). But I don't have ide how to manage it.
|-----------------------------------------
| |
| |
| |
| |
| * * |
| |
| |
| |
| |
|_______________________|
(r=0)
Above it is represented my domain with the two points of intensity described by *.
Could someone help me, please?
I would be really grateful.
Thanks in advance.
I am looking forward to hearing from you.
Best regards,
Isabel.
2 Replies Last Post May 11, 2011, 12:16 p.m. EDT
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Posted:
1 decade ago
Isabel,
an 'intensity' in Amperes would be a current I. So, you could define two circles at the location of those points and assign the external current density rhoI = I/a, with a being the area of the circles. This creates two ring currents.
But I am not completely sure if this is what you want.
Cheers
Edgar
an 'intensity' in Amperes would be a current I. So, you could define two circles at the location of those points and assign the external current density rhoI = I/a, with a being the area of the circles. This creates two ring currents.
But I am not completely sure if this is what you want.
Cheers
Edgar
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Posted:
1 decade ago
Thank-you for your reply.
sorry for having used the word "intensity" where I wanted to use "current". I have mixed up Spanish with English, sorry again.
Yes, I am trying to create two small circles and later to apply "Difference" from "Geometry->Boolean Operations" in order to remove the circles' areas from the square area, but I don't get the correct result, perhaps because the circles are two small... could it be possible?
Again, thanks and sorry!
Best regards,
Isabel.
sorry for having used the word "intensity" where I wanted to use "current". I have mixed up Spanish with English, sorry again.
Yes, I am trying to create two small circles and later to apply "Difference" from "Geometry->Boolean Operations" in order to remove the circles' areas from the square area, but I don't get the correct result, perhaps because the circles are two small... could it be possible?
Again, thanks and sorry!
Best regards,
Isabel.