I've been trying to use VectorTools::project_boundary_values_div_conforming 
in a similar model to what Jane Lee is working on. I get a seg fault 
however when I run it on multiple processes with a 
parallel::distributed::Triangulation. Is it meant to work for distributed 
triangulations? 

I don't see any if (cell->is_locally_owned()) checks in the implementation, 
so I'm suspecting not. 

Thanks,
Jonathan

On Thursday, August 30, 2018 at 9:41:51 AM UTC-7, Wolfgang Bangerth wrote:
>
> On 08/30/2018 04:35 AM, Jane Lee wrote: 
> > I believe the Neumann conditions are strongly imposed. 
> > 
> > And yes - I realised that inhomogeneous Neumann bc is ambiguous 
> phrasing. 
> > 
> > I mean that I have a conditions k grad p.n =g, or u.n = g equivalently, 
> > I think this is in point 3 in my notes in my original post but i think 
> > it was unclear what u was. I want to impose a nonzero condition on the 
> > normal derivative of the pressure. 
>
> Jane: Konrad already gave the correct answer. There is also the function 
> VectorTools::project_boundary_values_div_conforming: 
>
> https://www.dealii.org/9.0.0/doxygen/deal.II/group__constraints.html#ga86427a4e8b3a7e580dabb4e473005288
>  
>
> Best 
>   W. 
>
> -- 
> ------------------------------------------------------------------------ 
> Wolfgang Bangerth          email:                 bang...@colostate.edu 
> <javascript:> 
>                             www: http://www.math.colostate.edu/~bangerth/ 
>

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