ExplicitSSPRungeKutta.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "ExplicitTimeIntegrator.h"

class ExplicitSSPRungeKutta : public ExplicitTimeIntegrator
{
public:
  static InputParameters validParams();

  ExplicitSSPRungeKutta(const InputParameters & parameters);

  virtual void computeTimeDerivatives() override;
  virtual void computeADTimeDerivatives(ADReal & ad_u_dot,
                                        const dof_id_type & dof,
                                        ADReal & ad_u_dotdot) const override;
  virtual void solve() override;
  virtual void postResidual(NumericVector<Number> & residual) override;
  virtual int order() override { return _order; }
  virtual bool overridesSolve() const override { return true; }

protected:
  bool solveStage();

  virtual Real duDotDuCoeff() const override;

  const MooseEnum & _order;

  unsigned int _n_stages;
  std::vector<std::vector<Real>> _a;
  std::vector<Real> _b;
  std::vector<Real> _c;
  unsigned int _stage;
  std::vector<const NumericVector<Number> *> _solution_stage;

  NumericVector<Number> * _solution_intermediate_stage;
  NumericVector<Number> * _tmp_solution;
  NumericVector<Number> * _tmp_mass_solution_product;
};