Thank you Prof. Bangerth. I am always greatfull for your input. On Friday, March 10, 2023 at 10:27:49 PM UTC+1 Wolfgang Bangerth wrote:
> On 3/8/23 07:49, Abbas wrote: > > > > I am solving a nonlinear problem with DG and my BCs are in the weak > form. It > > would be helpful if I start with a solution vector that is closer to the > > prescribed solution so I won't have to do iterations otherwise would > have been > > unnecessary. > > For a purely linear problem, I need to do two non_linear iterations to > > converge instead of 1. > > If I can't use VectorTools::interpolate_boundary_values what are my > options? > > Does VectorTools::project_boundary_values work in that case? > > No, it also needs to know which DoFs are located on the boundary, but for > DG > elements no DoFs are logically on the boundary. > > I don't see a good solution to your problem that uses what's already in > the > library. I imagine that using code similar to what's in > interpolate_boundary_values() but using a different way of finding out > which > DoF's support point is physically (though not logically) located on the > boundary, this all could be implemented in 200 lines of code. But there is > nothing simple the obvious already provides you for this case. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > 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/4334127b-3826-404a-b4e4-8180b0def2b5n%40googlegroups.com.
