Re: NEC-LIST: NEC 4.1 Anomaly

Dear Frank,
at first I ignored your post as mere NEC4 bragging, just like "look Ma, no
hands" thing, but on the other look, there are some details I noted on NEC2
before. (please note that I have no access to NEC4 so far) I've noted the
same anomaly when rotating meshes using MSexcel. Too often some segments
get detached due to rounding, and mutual distances seem negligible. Segment
currents are the only method of verification.
There is another one I found funny, and often useful: zigzagging wires with
odd numbers of segments, in a way that there is no nod in a middle acts as
the wires are mutually insulated - great tool for simplifying crossed loops.
I've lost some edge with NEC as I did not run a single simulation for over
a year now, but I am still waiting for NEC4 to become available. Any news?
Davor

At 19.03.2006, 10:33, you wrote:

>I have been trying to model an inductor in NEC 4.1, (code shown below)
>single precision (NEC4S600). I have observed a disconnect of 55
>micro-meters between segments 300 and 301 -- which is treated as an open
>circuit (>0.001 of a segment length at 44 micro-meters).
>
>Changing the number of segments, or the number of turns, by one or more,
>corrects
>the problem. Typically the segment end-points are within < 3 micro-meters.
>I have not identified all conditions when this occurs, but some other
>combinations
>of segments, and turns, do produce a disconnect. I have not completely
>investigated NEC 4.1, double precision, but it does run the code below with
>no disconnect evident.
>
>I have used Excel to compute the segment end points from the NEC output
>file.
>
>I would be very interested if anybody else has observed such an anomaly.
>
>
>Frank Meredith
>
>CM Inductor Calculation (NEC 4.1)
>CE
>GH 1 300 15 12 6 6 0.02015 0.02015 0
>GW 2 3 6 0 12 0 0 12 0.02015
>GW 3 6 0 0 12 0 0 0 0.02015
>GW 4 3 0 0 0 6 0 0 0.02015
>GS 0 0 0.025400
>GE 0
>EX 0 3 3 00 1 0
>FR 0 5 0 0 3.7 0.02
>LD 5 1 1 312 5.7001E7
>RP 0 181 1 1000 -90 90 1.00000 1.00000
>EN
>
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