void DriftTransport::operator() ( const std::array<double,2> &x , std::array<double,2> &dxdt , const double /* t */ )
{
// FIXME: avoid temporal creation overhead
Array<double> e_field((std::size_t) 2); // temp wrap for e. field
double e_field_mod;
Point eval_point(x[0],x[1],0.0);
(*_d_f_grad)(e_field, eval_point);
e_field_mod = sqrt(e_field[0]*e_field[0] + e_field[1]*e_field[1]);
dxdt[0] = _sign*_mu.obtain_mobility(e_field_mod) * e_field[0];
dxdt[1] = _sign*_mu.obtain_mobility(e_field_mod) * e_field[1];
}
error_map<scalar> run_boris_sdc()
{
pfasst::SDC<> sdc;
const size_t nsteps = pfasst::config::get_value<size_t>("num_steps", 10);
const double dt = pfasst::config::get_value<double>("delta_step", 0.015625);
const size_t nnodes = pfasst::config::get_value<size_t>("num_nodes", 5);
// const size_t nparticles = 1;
const size_t niters = pfasst::config::get_value<size_t>("num_iter", 7);
const double mass = 1.0;
const double charge = 1.0;
const double epsilon = pfasst::config::get_value<scalar>("epsilon", -1.0);
auto quad = pfasst::quadrature::quadrature_factory<double>(nnodes, pfasst::quadrature::QuadratureType::GaussLobatto);
auto factory = make_shared<Particle3DFactory<double, double>>(mass, charge);
typedef SimplePhysicsEnergyOperator<double, double, Particle3DEncapsulation,
IdealQuadrupolePotential, ConstantMagneticField> energy_operator_type;
energy_operator_type::e_field_type e_field(epsilon);
energy_operator_type::b_field_type b_field;
energy_operator_type e_operator(e_field, b_field, epsilon);
auto sweeper = make_shared<pfasst::examples::boris::BorisSweeper<double, double, energy_operator_type>>(e_operator, epsilon);
sweeper->set_energy_operator(e_operator);
sweeper->set_quadrature(quad);
sweeper->set_factory(factory);
sdc.add_level(sweeper);
sdc.set_duration(0.0, nsteps*dt, dt, niters);
sdc.setup();
auto p0 = dynamic_pointer_cast<Particle3DEncapsulation<double, double>>(sweeper->get_state(0));
p0->pos().x = 10;
p0->vel().u = 100;
p0->vel().w = 100;
sweeper->set_initial_energy();
cout << "Initial Particle: " << *(dynamic_pointer_cast<Particle3DEncapsulation<double, double>>(sweeper->get_state(0))) << endl;
sdc.run();
return sweeper->get_errors();
}
