Hi dear Magnus Olsson
I wanted to simulate a time dependent current carrying wire for determining magnetic field around the wire.
So in the first step, I simulated my wire in mfh, and feed time dependent current to the wire with "external current density", but it doesn't work correctly.
So I simulate my 3D infinite wire with coupling "magnetic field" and "electric current" in time dependent study. Then I feed current into wire with "terminal" and "ground" in "electric current". Then couple it with "magnetic field" by "external current density" and "ec.Jx, ec.Jy, ec.Jz" variables or couple it with "linear multi turn coil" and "ec.normJ*1[mm^2]". But again result of magnetic field isn't correct and result of this according to finite wire.
I attached figure of my simulation for you. Please check it and inform me how can I change result according to infinite wire?
If I want to say clearly difference between magnetic field of finite wire and infinite wire, I should to nudge formulation of them.
in finite wire magnetic field determine with:
H=I/(2*pi*R)
but in infinite wire:
H=(I/4*pi*R)*(sin a2 - sin a1)
where:
I: wire current.
R: distance between wire and point that I want to see magnetic field.
a1 & a2: see the attache file please.
but the all result of comsol is according to the first formulation. could you please tell me how can I change the formulation or how I get the correct result from comsol for infinite wire?
Thank you so much and with best regards,
I wanted to simulate a time dependent current carrying wire for determining magnetic field around the wire.
So in the first step, I simulated my wire in mfh, and feed time dependent current to the wire with "external current density", but it doesn't work correctly.
So I simulate my 3D infinite wire with coupling "magnetic field" and "electric current" in time dependent study. Then I feed current into wire with "terminal" and "ground" in "electric current". Then couple it with "magnetic field" by "external current density" and "ec.Jx, ec.Jy, ec.Jz" variables or couple it with "linear multi turn coil" and "ec.normJ*1[mm^2]". But again result of magnetic field isn't correct and result of this according to finite wire.
I attached figure of my simulation for you. Please check it and inform me how can I change result according to infinite wire?
If I want to say clearly difference between magnetic field of finite wire and infinite wire, I should to nudge formulation of them.
in finite wire magnetic field determine with:
H=I/(2*pi*R)
but in infinite wire:
H=(I/4*pi*R)*(sin a2 - sin a1)
where:
I: wire current.
R: distance between wire and point that I want to see magnetic field.
a1 & a2: see the attache file please.
but the all result of comsol is according to the first formulation. could you please tell me how can I change the formulation or how I get the correct result from comsol for infinite wire?
Thank you so much and with best regards,
