Hi
With COMSOL you can really do about everything, but as with most thing you need to have some clear ideas about what you have, what you need, and where you want to go. Your explanations so far does not help me enough to understand really what you are trying to do, hence difficult to exchange and propose something.
Your sketch is a good starting point, I understand its ACDC with currents, but static, quasi static ... ? you talk about capacitive corrections, this gives me the feeling of RF but transient or harmonic needs, are we still in the ACDC domain, and what about skin effects ? (we could start without and in ACDC no?)
can you go with 2D, 2D-axi or must we work in 3D (I strongly suggest to start with 2D). What is constant and what is changing/moving ? Only ACDC coupling or also thermal ? ...
Note that electromagnetics is slightly tricky for your mind, as a current in one plane means magnetic field in the two perpendicular planes, therefore 2D is really a pseudo 3D but with distinguished in-plane or out of plane currents or fields
You talk about two coils, as I understand these are two/multi turns (?) then you can normally simulated them as a single turn by adapting area/volume and current. but if you want to couple between two separate coils you need to simulate them as two separate items
Personally I would start with 2D axisymmetry, Quasi static Magnetics azimutal current (emqa), the best I can guess from your text and sketches, then what next ?
that is coordonates r phi z, dependent variables: Aphi
This means the transform from 2D to 3D is throuigh the (2*pi*r) multiplicant.
This defines the physics (COMSOL shows the formulas nicely for ACDC) and you need either Vloop or Je_phi the current density to define subdomain variables.
To start with a 2-turn or a 2*one-turn is probably the same, in the sens you define Vloop = V_per_turn and/or Je_phy = N*I_wire/Area_wire*Fill_factor (typically Fill_factor is somehere between 55-66%) if you want to go to the "engineering" level immediatly.
Then if you want to move (physically along r,z) one coil w.r.t. the other one need to decide how, parametrised geometry (still lengthy in 3.5a, expecting nice simplfications in 4) with our without CAD link (?) or as ALE or with inequalities over the subdomain ?
How far to move, is it sensitivity analysis or really induction over large displacement ranges ?
Then which parameters to "measure" which output is the goal?
optimising coupling, metrology of motion through ACDC effects ?
Finally one need to introduce the surroundings, as mostly there are other materials around the coils that might introduce side effects, but this we can leave to the end.
My way is to write out as much as I can on paper, to sort/group the items and define an approch in 2-3 steps
Does this help you on the way ?
Hope so, good luck
Ivar
With COMSOL you can really do about everything, but as with most thing you need to have some clear ideas about what you have, what you need, and where you want to go. Your explanations so far does not help me enough to understand really what you are trying to do, hence difficult to exchange and propose something.
Your sketch is a good starting point, I understand its ACDC with currents, but static, quasi static ... ? you talk about capacitive corrections, this gives me the feeling of RF but transient or harmonic needs, are we still in the ACDC domain, and what about skin effects ? (we could start without and in ACDC no?)
can you go with 2D, 2D-axi or must we work in 3D (I strongly suggest to start with 2D). What is constant and what is changing/moving ? Only ACDC coupling or also thermal ? ...
Note that electromagnetics is slightly tricky for your mind, as a current in one plane means magnetic field in the two perpendicular planes, therefore 2D is really a pseudo 3D but with distinguished in-plane or out of plane currents or fields
You talk about two coils, as I understand these are two/multi turns (?) then you can normally simulated them as a single turn by adapting area/volume and current. but if you want to couple between two separate coils you need to simulate them as two separate items
Personally I would start with 2D axisymmetry, Quasi static Magnetics azimutal current (emqa), the best I can guess from your text and sketches, then what next ?
that is coordonates r phi z, dependent variables: Aphi
This means the transform from 2D to 3D is throuigh the (2*pi*r) multiplicant.
This defines the physics (COMSOL shows the formulas nicely for ACDC) and you need either Vloop or Je_phi the current density to define subdomain variables.
To start with a 2-turn or a 2*one-turn is probably the same, in the sens you define Vloop = V_per_turn and/or Je_phy = N*I_wire/Area_wire*Fill_factor (typically Fill_factor is somehere between 55-66%) if you want to go to the "engineering" level immediatly.
Then if you want to move (physically along r,z) one coil w.r.t. the other one need to decide how, parametrised geometry (still lengthy in 3.5a, expecting nice simplfications in 4) with our without CAD link (?) or as ALE or with inequalities over the subdomain ?
How far to move, is it sensitivity analysis or really induction over large displacement ranges ?
Then which parameters to "measure" which output is the goal?
optimising coupling, metrology of motion through ACDC effects ?
Finally one need to introduce the surroundings, as mostly there are other materials around the coils that might introduce side effects, but this we can leave to the end.
My way is to write out as much as I can on paper, to sort/group the items and define an approch in 2-3 steps
Does this help you on the way ?
Hope so, good luck
Ivar