Number CoupledFEMFunctionsy::operator()(const FEMContext& c, const Point& p,
const Real /* time */)
{
Real weight = 0.0;
switch(var)
{
case 1:
{
Gradient grad_C = c.point_gradient(3, p);
weight = grad_C(1);
}
break;
case 3:
{
Number v = c.point_value(1, p);
weight = v;
}
break;
default:
{
std::cout<<"Wrong variable number "<<var<<" passed to CoupledFEMFunctionsy object ! Quitting !"<<std::endl;
libmesh_error();
}
}
return weight;
}
// These functions supply the nonlinear weighting for the adjoint residual error estimate which
// arise due to the convection term in the convection-diffusion equation:
// ||e((u_1)_h C,1)||_{L2} ||e(C^*)||_{L2} + ||e(u1 C,1_h)||_{L2} ||e(C^*)||_{L2}
// ||e((u_2)_h C,2)||_{L2} ||e(C^*)||_{L2} + ||e(u2 C,2_h)||_{L2} ||e(C^*)||_{L2}
// These functions compute (u_1)_h or C,1_h , and (u_2)_h or C,2_h , and supply it to the weighted patch recovery error estimator
// In CoupledFEMFunctionsx, the object built with var = 0, returns the (u_1)_h weight, while
// the object built with var = 1, returns the C,1_h weight. The switch statment
// distinguishes the behavior of the two objects
// Same thing for CoupledFEMFunctionsy
Number CoupledFEMFunctionsx::operator()(const FEMContext& c, const Point& p,
const Real /* time */)
{
Number weight = 0.0;
switch(var)
{
case 0:
{
Gradient grad_C = c.point_gradient(3, p);
weight = grad_C(0);
}
break;
case 3:
{
Number u = c.point_value(0, p);
weight = u;
}
break;
default:
libmesh_error_msg("Wrong variable number " \
<< var \
<< " passed to CoupledFEMFunctionsx object! Quitting!");
}
return weight;
}
