[Getdp] Neuman boundary conditions for Electrostatic model

[Christophe Geuzaine]

Taras Danilchenko wrote:
> Dear friends,
> Sorry, for the stupid question (the book of A.Bossavit is on it's way to
> me):  how can I set non-homogeneous Neumann boundary condition to the
> Electrostatic model (from GetDP Manual)? 
> May be there is an examples? (I don't find any in mailing list and GetDP
> Wiki)

You didn't look hard enough ;-)

In the wiki, for example, http://geuz.org/getdp/wiki/ThermalProblem 
contains a formulation with a Neumann BC ("Galerkin{[-Flux[],{T}]...").

Two things to pay attention to:

1) the domain of integration has to be included in the FunctionSpace
(cf. Sur_The/Tot_The in the wiki example)

2) you need to specify the appropriate Jacobian for the boundary
integration (cf. JSur in the wiki example)

Take care,

Christophe

-- 
Christophe Geuzaine
Applied and Computational Mathematics, Caltech
geuzaine at acm.caltech.edu - http://geuz.org