Hello,
I am currently implementing something that makes use of TRI3SUBDIVISION
elements, and one of the initial things that I want to do is to compute the
nodal coordinates for each deformed element. I am trying to avoid the use of
MeshFunction to do this. Of course since subdivision shape functions are not
interpolatory, I can’t just use the solution of the coordinate system directly
as the coordinates of the element vertices. So what I am trying to use QTrap
that uses nodal quadrature points and evaluating the shape functions at the
quadrature points for a given element to get something like
std::unique_ptr<libMesh::FEBase> fe(libMesh::FEBase::build(2,
libMesh::SUBDIVISION));
std::unique_ptr<libMesh::QBase> qrule = libMesh::QBase::build(libMesh::QTRAP,
2, libMesh::FIRST);
fe->attach_quadrature_rule(qrule.get());
fe->reinit(elem);
for (unsigned int qp = 0; qp < qrule->n_points(); ++qp)
{
for (unsigned int d = 0; d < 3; ++d)
{
for (unsigned int i = 0; i < phi.size(); ++i)
{
X_node[qp][d] += X_solution[i][d] * phi[i][qp];
}
}
}
X_solution is where the solution of the coordinate system has been stored.
Does this seem reasonable?
But quadrature_trap_2D.C complained because TRI3SUBDIVISION is not supported.
Is it safe to hardcode TRI3SUBDIVISION as a case in the code? Or is there a
different way to go about it (e.g. is there a different nodal quadrature rule
that supports TRI3SUBDIVISION)?
Thank you,
Mike
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