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[Getfem-users] Sign of model_pb - residual in Classical_Newton

From: Konstantinos Poulios
Subject: [Getfem-users] Sign of model_pb - residual in Classical_Newton
Date: Thu, 26 Nov 2009 19:40:17 +0100

I have found some difficulties in nonlinear solutions in combination
with the new brick system. For a very simple nonlinear model that I
have converted from the old brick system, the classical_Newton
subroutine diverges. Trying to trace down the problem I realized that
in the first iteration step the residual of the model_pb object used
in the classical_Newton subroutine, has a different sign as the
corresponding one in the old brick system. I my test case the residual
I have checked was exclusively due to a source_term. Perhaps the
following two screenshots could be helpful to understand:

Was this sign difference to expect? Should this sign difference be
taken into consideration when migrating bricks from the old system to
the new one? Could it be a bug? My question affects version 4.0.0.


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