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# continuous looping in fkern

- To: femm@yahoogroups.com
- Subject: continuous looping in fkern
- From: "shazanaz2000" <smartmicro@hotmail.com>
- Date: Tue, 12 Nov 2002 06:46:54 -0000
- User-agent: eGroups-EW/0.82

    hi,

    I'm doing some small fea analysis. my pc is a celeron500 with 64mb
    memory. My problem is not more than 100mm x 100mm planar. mesh size
    varies from 0.1mm in some blocks to 5mm in air. total node count is
    around 18k to 30k (depending on mesh sizes).

    The problem I face is:
    sometimes..., fkern loops for an inordinately long time without
    upgrading the newton iteration counter while continuously looping
    in "matrix construction" and "conjugate solver". If I stop fkern and
    adjust my file (I move any one or two node points or change the mesh
    size -slightly- at any one place) the next time fkern completes. this
    I've noticed in not one problem but in many. Am I doing something
    wrong? is my computer slow? I've even seen the NI count decreasing!!
    Is that supposed to happen?

    One more question please.
    my project is like a permanent magnetgun. I need to apply an
    attractive force of 250 Newtons on a projectile (iron/steel) about
    100mg weight from a min. distance of 1mm away from the surface of the
    magnet. What would be the size, shape and any other properties of the
    permanent magnet (NdFeB) required to do the job? the shape (of both)
    is adjustable. The projectile is never less than 1mm away from the
    magnet.

    Thanks prem for enlightening me.

    Shiv

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