KokkosRadiativeHeatFluxBCBase.h

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//* This file is part of the MOOSE framework
//* https://www.mooseframework.org
//*
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//* 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 "KokkosIntegratedBCValue.h"

class KokkosRadiativeHeatFluxBCBase : public Moose::Kokkos::IntegratedBCValue
{
public:
  static InputParameters validParams();
  KokkosRadiativeHeatFluxBCBase(const InputParameters & parameters);

  template <typename Derived>
  KOKKOS_FUNCTION Real precomputeQpResidual(const unsigned int qp, AssemblyDatum & datum) const;
  template <typename Derived>
  KOKKOS_FUNCTION Real precomputeQpJacobian(const unsigned int j,
                                            const unsigned int qp,
                                            AssemblyDatum & datum) const;

protected:
  const Real _sigma_stefan_boltzmann;

  const Real _tinf;
};

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosRadiativeHeatFluxBCBase::precomputeQpResidual(const unsigned int qp,
                                                    AssemblyDatum & datum) const
{
  auto bc = static_cast<const Derived *>(this);

  Real T = _u(datum, qp);
  Real T4 = T * T * T * T;
  Real T4inf = _tinf * _tinf * _tinf * _tinf;
  return _sigma_stefan_boltzmann * bc->coefficient() * (T4 - T4inf);
}

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosRadiativeHeatFluxBCBase::precomputeQpJacobian(const unsigned int j,
                                                    const unsigned int qp,
                                                    AssemblyDatum & datum) const
{
  auto bc = static_cast<const Derived *>(this);

  Real T = _u(datum, qp);
  Real T3 = T * T * T;
  return 4 * _sigma_stefan_boltzmann * bc->coefficient() * T3 * _phi(datum, j, qp);
}