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# Re: [femm] [A few questions]

- To: femm@yahoogroups.com
- Subject: Re: [femm] [A few questions]
- From: "you se-ho" <sxy28@hotmail.com>
- Date: Wed, 08 Aug 2001 17:14:43
- Bcc:

`
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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