I'm wondering whether I've misunderstood how to use the FunctionMap
declaration. I'm needing it to use for
VectorTools::compute_nonzero_normal_flux_constraints
At the moment I am trying to apply nonzero normal component of the normal
stress in step-22 on a boundary id that is 2
I have tried
std::set<types::boundary_id> bottom_normal_flux_boundaries;
bottom_normal_flux_boundaries.insert (2);
typename FunctionMap<dim>::type bottom_normal_map;
RockBottomValues<dim> bottom_nonzero_normal_stress;
bottom_normal_map[0] = &bottom_nonzero_normal_stress;
VectorTools::compute_nonzero_normal_flux_constraints
(dof_handler, 0,
bottom_normal_flux_boundaries,
bottom_normal_map,
constraints);
with my nonzero function as
template <int dim>
class RockBottomValues : public Function<dim>
{
public:
RockBottomValues () : Function<dim>(1) {}
virtual double value (const Point<dim> &p,
const unsigned int component = 0) const;
};
template <int dim>
double RockBottomValues<dim>::value (const Point<dim> &p,
const unsigned int
/*component*/) const
{
return -10.0+p[1];
}
I'm not sure if I understand what I am doing when i write,
bottom_normal_map[0] = &bottom_nonzero_normal_stress;
I original had bottom_normal_map[2] = &bottom_nonzero_normal_stress;
as i thought it was to do with the boundary indicator.
The first gave me a segmentation fault error, something to do with memory
i'm guessing, and the second gave me a dimension mismatch error, even
though my normal component would just be a scalar value.
I've read the documentation numerous times, and step-16 seems to be the
only place where it is doing something similar, and I think I am getting
confused with different boundary ids or generally not understanding
FunctionMap properly. I'd appreciate if someone could point me into the
right direction as to where i'm using something incorrectly.
Many thanks for your help.
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