Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

about error in value getting

Please login with a confirmed email address before reporting spam

Dear all ,
I am doing simulation on inductive coupling , taking two coils , one with six turns , another with single turn ,
I am exiciting my coil by voltage at 320 V , and i am observing the flux and mutual inductance and the magnetic field density , by derived value , under global evaluation , i got flux is around 1.11*10^-5
i derived this value by putting following expression , when i am deriving values from global derivation

real(((mf.VCoil_2/mf.ICoil_3/mf.iomega)*mf.ICoil_3)) = flux

from normal physical law , we know Flux = Inductance *current
If i want to find inductance , flux/current
i expressed this in terms of above expression

real(((mf.VCoil_2/mf.ICoil_3/mf.iomega))) = inductance
when i am dividing flux by current i am not getting exact answer , what i need to get , i need to get 2.59*10^-6 as a inductance
but i am getting around 8.99*10^-5

can you pls let me know where is the problem

ama ttaching the model

--
kishore Naik Mude


1 Reply Last Post 2012年11月12日 GMT-5 14:29
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年11月12日 GMT-5 14:29
Hi

I'm not by my WS just now so I cannot open your model, but have you checked the Knowledge Base (main COMSOL site) about flux derivations, and have you checked your mesh sensitivity ?
a factor about 3 could be such kind of effects playing you some games

--
Good luck
Ivar
Hi I'm not by my WS just now so I cannot open your model, but have you checked the Knowledge Base (main COMSOL site) about flux derivations, and have you checked your mesh sensitivity ? a factor about 3 could be such kind of effects playing you some games -- Good luck Ivar

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.