[Getdp] ... non-linear iteration convergence ...

Matt Koch mattkoch at scitex.us
Tue Sep 29 00:59:54 CEST 2009


Hello All,

I have made some progress on my radiative heat exchange problem from a 
long time ago. This is true radiative heat exchange with configuration 
factors, not just a simple T^4 boundary condition. However, I am facing 
convergence problems in my non-linear iteration and have to go to 
relaxation factors as small as 0.01 and smaller in order to make things 
move, and even then it often fails to converge. Does anyone have any 
advice on such an issue? Are there other approaches to solving a 
non-linear problem in GetDP, i.e. other than "IterativeLoop[ItnCnt, 
ItnErr, ItnRlx]"? For example, I stumbled across a JacNL notation 
somewhere, but have no idea how to set this up?Any thoughts would be 
much appreciated.

Thanks,

Matt Koch, Ph.D., P.E.
Science & Technology Consultants (SciTeX)
www.scitex.us
mattkoch at scitex.us
(830)-249-9499 (o)
(830)-446-1839 (c)
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