Re: [femm] [A few questions]

["you se-ho" <sxy28@xxxxxxxxxxx>]

To Dear Dr. Meeker and All:

How are you? I try to implement to ABC since I think it is more exact
compared to truncation of outer boundaries.

I am comparing the equation (46) and equation (21) in FEMM manual. I am 
almost sure that mu_r disappeared because in outer spaced the domain should 
be air or free space, so mu_r = 1. (I think even if domain is not air, it is 
not difficult to include this term.) However, if I multiply mu_r and mu_0 in 
equation (21) to both side, I think the term should be in the numerator. I 
think equation (46) is correct from last e-mail. My guesses are

(1) mu_0 and mu_r coefficients should move to the 2nd term in equation (21). 
or

(2) Equation (21) is correct, too. The equation (46) and (21) are different 
books. Therefore, they are not consistent each other.

When applying the BC, I believe that I should apply the solution of equation 
(45), which is A=r*exp(-(n/(mu*r)) on the boundary. By somehow, it started 
from mixed boundary condition, but ended up with Dirichlet condition. Am I 
Ok ?

Thanks.
Sincerely,
SE-HO YOU








> > To Dear All:
> >
> > How are you? I have a few questions.
> >
> > (1) In the manual, denominator in equation (44) should be r^(n+1). It is
> > obvious mistake, but it did not change from previous manual.
>
> Whoops--I'll correct this equation.
>
>
>
> > The thing I wanted to ask is
> > How I can use the mixed boundary condition. If I check the axi1.fem 
> file,
> > the c0 coefficient is 6962160. Is this from (1/(mu_0*4.5 inch * 0.0254) 
> ? I
> > would like to make sure that I know correctly. If the problem is the 
> planar
> > in rectangular coordinate, Can I still use same equation (from the 
> center
> > of
> > area of interest to most outside boundary) ?
> >


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