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# Revised development version

- To: femm mailing list <femm@yahoogroups.com>
- Subject: Revised development version
- From: David Meeker <dmeeker@ieee.org>
- Date: Thu, 02 Jan 2003 10:08:27 -0500
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826 MultiZilla/v1.1.22

`I've put up another revision of the development version of femm 3.3. This one is called 3.3alpha2. See:
http://femm.berlios.de/femm33src.zip
http://femm.berlios.de/femm33bin.exe`
`In the 3.3alpha1 release, I had inadvertently introduced a bug into the harmonic axisymmetric while changing it to do the nonlinear time harmonic solutions which made that solver give the wrong results (oh, well--3.3a1 /is/ an alpha version...) If you've been using this part of the 3.3a1 solver, you should definitely get the 3.3a2 version instead.`
`Several modifications have been made since the 3.3a1 version:`
`/Can now abort running lua scripts/. Any lua script or lua command entered from the console can be aborted by hitting the <Break> key. In addition, the pre- and post- processor don't "freeze up" anymore when a script is running (This means, for example, that any print statements in your lua scripts get immediately displayed in the lua console, rather than waiting until the end of the run). For those of you that are interested in how this works, I implemented a "linehook" function (a feature built in to lua) that gets called every time a line in a lua script or command gets processed. This linehook function processes any messages that might be on the queue, so that the display doesn't freeze up. If the linehook function detects that <Break> has been pressed, it calls the lua_error function, which aborts the evaluation in progress.`
`/Improved lamination model for nonlinear time harmonic problems./ Version 3.3a1 used a kludge where the permeability at the surface of a nonlinear lamination was simply plugged into the linear formula for effective lamination permeability. Version 3.3a2 instead solves a series of 1D nonlinear time harmonic finite element problems for each laminated, nonlinear material (one at each level of H defined in the B-H curve) to get the "right" effective BH curve for the laminated material, including the effects of hysteresis and eddy currents. If you're interested in checking out the 1D solution at each point, it's implemented in the function:
CComplex CMaterialProp::LaminatedBH(double w, int i)
at the end of matprop.cpp in the fkn source code.`
`/Now using the latest version of Triangle./ A new version of the Triangle mesh generator came out a couple of months ago. The 3.3a2 version included this latest version of the Triangle code.`
`Anyhow, I'd be curious as to comments and bug reports about this latest revised development version. Not that since I've been monkeying around with the way that the time harmonic solver works, there could again be bugs--if you value stability, stick to the 3.2 version for now.
--
David Meeker
email: dmeeker@ieee.org
www: http://femm.berlios.de/dmeeker`

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