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# Re: [femm] Updated femm30 beta

- To: femm@egroups.com
- Subject: Re: [femm] Updated femm30 beta
- From: "you se-ho" <sxy28@hotmail.com>
- Date: Fri, 27 Oct 2000 22:57:38 GMT

``

> `From: David Meeker <dmeeker@foster-miller.com>
> Reply-To: femm@egroups.com
> To: femm@egroups.com
> Subject: [femm] Updated femm30 beta
> Date: Tue, 24 Oct 2000 14:02:30 -0400
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> > `From sentto-1333690-144-972411148-sxy28 Tue Oct 24 11:16:13 2000`

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> `All--`

>     I've uploaded an updated version of femm 3.0 beta to the files section
>     of egroups at:
>     http://www.egroups.com/files/femm/

>     For those who are interested in this sort of thing, I've also uploaded
>     the full source to the 3.0 version at the same place. You'll need
>     Microsoft Visual C++ version 4 or later if you are interested in
>     compiling it on your own. The 3.0 version executable and source are
>     released under the Aladdin Free Public License. The short version of
>     AFPL is use the source and program, modify it and/or redistribute it if
>     you want, but don't sell the program and don't sue the author.

> `Anyhow, this updated version has the following changes:`

>     1) It was brought to my attention that the way that the program
>     computed stored energy worked right only for linear materials. It has
>     been modified to give the correct results for energy with nonlinear
>     materials. I have also added the calculation of coenergy, which is
>     useful for determining forces via energy methods in nonlinear problems.

>     2) I've modified the flux line plots so that the range over which the
>     lines are plotted is user-specifiable. This one has been a frequent
>     request.

>     3) I've added in a new property called "Solver Precision", that you
>     define in the same dialog as frequency and length units. The default,
>     1.e-8, was the limit hard-coded into previous version of femm. You can
>     decrease this down as far as 1.e-16 if you feel like it. This number
>     sort of specifies the number of significant digits in the solution to
>     the magnetic vector potential, A. For example, roughly 1.e-08
>     corresponds to 8 digits, 1.e-16 to 16 digits. Some people had asked for
>     this ability.

>     4) The methods for interpolating potential and calculating flux density
>     in axisymmetric problems were modified. The modifications yields a few
>     more decimal places of accuracy in some specialized problems. The
>     answers to most axisymmetric problems won't be noticably affected by
>     these changes.

> `Dave.`
> `<< dmeeker.vcf >>`

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