Real
AB2PredictorCorrector::estimateTimeError(NumericVector<Number> & solution)
{
_pred1 = _fe_problem.getNonlinearSystemBase().getPredictor()->solutionPredictor();
TimeIntegrator * ti = _fe_problem.getNonlinearSystemBase().getTimeIntegrator();
std::string scheme = ti->name();
Real dt_old = _my_dt_old;
if (dt_old == 0)
dt_old = _dt;
switch (stringtoint(scheme))
{
case 1:
{
// NOTE: this is never called, since stringtoint does not return 1 - EVER!
//I am not sure this is actually correct.
_pred1 *= -1;
_pred1 += solution;
Real calc = _dt * _dt * .5;
_pred1 *= calc;
return _pred1.l2_norm();
}
case 2:
{
// Crank Nicolson
_pred1 -= solution;
_pred1 *= (_dt) / (3.0 * (_dt + dt_old));
return _pred1.l2_norm();
}
case 3:
{
// BDF2
_pred1 *= -1.0;
_pred1 += solution;
Real topcalc = 2.0 * (_dt + dt_old) * (_dt + dt_old);
Real bottomcalc = 6.0 * _dt * _dt + 12.0 * _dt * dt_old + 5.0 * dt_old * dt_old;
_pred1 *= topcalc / bottomcalc;
return _pred1.l2_norm();
}
default:
break;
}
return -1;
}
Real
AB2PredictorCorrector::estimateTimeError(NumericVector<Number> & solution)
{
_pred1 = _fe_problem.getNonlinearSystemBase().getPredictor()->solutionPredictor();
TimeIntegrator * ti = _fe_problem.getNonlinearSystemBase().getTimeIntegrator();
auto scheme = Moose::stringToEnum<Moose::TimeIntegratorType>(ti->name());
Real dt_old = _my_dt_old;
if (dt_old == 0)
dt_old = _dt;
switch (scheme)
{
case Moose::TI_IMPLICIT_EULER:
{
_pred1 *= -1;
_pred1 += solution;
Real calc = _dt * _dt * .5;
_pred1 *= calc;
return _pred1.l2_norm();
}
case Moose::TI_CRANK_NICOLSON:
{
_pred1 -= solution;
_pred1 *= (_dt) / (3.0 * (_dt + dt_old));
return _pred1.l2_norm();
}
case Moose::TI_BDF2:
{
_pred1 *= -1.0;
_pred1 += solution;
Real topcalc = 2.0 * (_dt + dt_old) * (_dt + dt_old);
Real bottomcalc = 6.0 * _dt * _dt + 12.0 * _dt * dt_old + 5.0 * dt_old * dt_old;
_pred1 *= topcalc / bottomcalc;
return _pred1.l2_norm();
}
default:
break;
}
return -1;
}
