Hi Dr. Bangerth, Thanks so much for the suggestion! My code works after applying the constraint on the Newton update!
Best, Jimmy On Monday, September 7, 2020 at 11:01:53 PM UTC-5, Wolfgang Bangerth wrote: > > On 9/7/20 6:40 PM, Jimmy Ho wrote: > > > > I have a general question regarding the application of periodic boundary > > conditions in Newton's method when solving nonlinear equations. Should > the > > periodic constraint be applied to the incremental Newton update, or > directly > > to the total solution vector? > > Periodicity constraints are not too different from the way you would deal > with > Dirichlet boundary conditions. step-15 discusses this in great length, and > the > solution is to make sure that your first iteration satisfies the > periodicity > constraints and that all updates do as well -- which ensures that all > iterates > do so, too. > > Best > W. > > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/ad19b669-acb2-422a-9b1a-e4e08c01ed69o%40googlegroups.com.
