Hi, all

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I am always thank you for all guys here in this community.
I have a question on the use of VectorTools::interpolate_boundary_values
functions
Typically we use this function in when we set-up system as in the form
VectorTools::interpolate_boundary_values (dof_handler,
1,
*Original**_VelBndValues<dim>(),*
constraints,
fe.component_mask(velocities));
The red lined functions are usually declared out side of main class.
One problem I am interested in now is to (Part A) solve stokes flow with no
slip boundary condition on every boundary one time (as step-22), -
and then to (Part B) solve same system again with slightly different
boundary condition comes from the straight problem
If I finish Part A, i have numerical solution of (u,p) linked with dot
handler.
In (Part B), I post process solutions part A, e.g. I calculated stress
value and I calculated tangential velocity of a boundary using Navier slip
condition,
So, I need to use
VectorTools::interpolate_boundary_values (dof_handler,
1,
*New_VelBndValues<dim>(),*
constraints,
fe.component_mask(velocities));
such that
template<intdim>
double
New_VelBndValues<dim>::value (constPoint<dim> &p,
constunsignedintcomponent) const
{
Assert (component < this->n_components,
ExcIndexRange (component, 0, this->n_components));
if(component == 0)
*return calc_tangential_velocity (); (Error Here!!)*
else
return0;
}
where '*calc_tangential_velocity ();' *is declared in main class, since I
should have information of dot_handler and solution vectors.
template<intdim>
classStokesProblem
{
public:
StokesProblem (constunsignedintdegree);
voidrun ();
private:
……
*double calc_tangential_velocity ();*
BlockVector<double> solution;
};
////////
Obviously, this method does not work, I mean I cannot compile the code and
it shows 'use of undeclared identifier 'calc_tangential_velocity' on the
line *(Error Here!!)*
I would appreciate any one who comment it. It seems that complier has to
know what is that before.
Will this be possible in a certain way? How can I go around this problem ?
Thanks,
Jaekwang
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