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Addition of gravity force in AC/DC module
Posted 9 nov. 2010, 15:23 UTC−5 Low-Frequency Electromagnetics 2 Replies
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Hello,
I need your help. I have to include the gravity force in my model of permanent ring magnet, which is stand on the iron surface. In my model I compute a magnetic force wchich I need to pull the iron surface to magnet.
Thank you for any help
Krystian
I need your help. I have to include the gravity force in my model of permanent ring magnet, which is stand on the iron surface. In my model I compute a magnetic force wchich I need to pull the iron surface to magnet.
Thank you for any help
Krystian
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2 Replies Last Post 11 nov. 2010, 11:40 UTC−5
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Posted:
1 decade ago
Hi
I'm not sue I understand, gravity forces exist in structural, but are not defined by default in ACDC, as F[N]=m[kg]*G[m/s^2] and the mass m is the sum over the domains of their densities, times the domain integral of 1*dVolume you should evaluate the mass and multiply by g_const, COMSOL internal value for G and add that to the correct coordinate direction, no?
Or you need to couple the structural physics, add a body load solid.rho*g_const, and add the magnetic forces as external imported forces
--
Good luck
Ivar
I'm not sue I understand, gravity forces exist in structural, but are not defined by default in ACDC, as F[N]=m[kg]*G[m/s^2] and the mass m is the sum over the domains of their densities, times the domain integral of 1*dVolume you should evaluate the mass and multiply by g_const, COMSOL internal value for G and add that to the correct coordinate direction, no?
Or you need to couple the structural physics, add a body load solid.rho*g_const, and add the magnetic forces as external imported forces
--
Good luck
Ivar
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Posted:
1 decade ago
Hello,
Ivar's advice is sound: the best idea is to set up your AC/DC model, then add a Solid Mechanics Physics Set. Now set a Volume Force to the appropriate domain where your force is the sum of the gravity and the other force calculated in the AC/DC physics set. You can look up the name of this force in the results node or under "View equations".
Good luck!
Ivar's advice is sound: the best idea is to set up your AC/DC model, then add a Solid Mechanics Physics Set. Now set a Volume Force to the appropriate domain where your force is the sum of the gravity and the other force calculated in the AC/DC physics set. You can look up the name of this force in the results node or under "View equations".
Good luck!