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[Andy R Terrel <question92522@xxxxxxxxxxxxxxxxxxxxx>]

Question #92522 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/92522

Andy R Terrel posted a new comment:
I believe this comes from the fact that the pointwise call always sets
on_boundary to be false:

http://bazaar.launchpad.net/~dolfin-
core/dolfin/main/annotate/head%3A/dolfin/fem/DirichletBC.cpp#L653

Also this method for a pinpoint will constrain more of the pressure than
you want, for better results do:

class Corner : public SubDomain
  {
  public:
    bool inside(const double* x, bool on_boundary) const
    {
      return (std::abs(x[0] - 1.0) <  DOLFIN_EPS ) &&
                (std::abs(x[1] - 1.0) <  DOLFIN_EPS);
    }
  };

Of course you have to apply this as pointwise because the geometric and
topological searches only look at facets and this is only hitting one
point.

-- Andy

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