On Thu, Oct 30, 2014 at 3:40 PM, Xujun Zhao <[email protected]> wrote:
> In all the Libmesh examples, only scalar-field exact solutions are attached
> to the ExactSolution by its member functions attach_exact_value() and
> attach_exact_deriv(), for example, poisson problem and convection-diffusion
> problem. I am curious how to attach the exact solution for a vector field
> problem, such as elasticity and fluid flows? I noticed there are member
> functions attach_exact_values() and attach_exact_derivs(), but their
> arguments are std::vector<FunctionBase<Number> *>, which is a container for
> multiple "system"s. If I only have one "system", but two variables:
> system.add_variable ("u", SECOND);
> system.add_variable ("v", SECOND);
The function pointer prototype is:
Number exact_solution(const Point& p,
const Parameters&, // EquationSystem
parameters, not needed
const std::string& sys_name,
const std::string& var_name);
var_name is an input parameter, so in the body of the function you
check what it is, i.e. "u", "v", "w", etc. and return the
corresponding exact solution for that component.
--
John
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