KokkosCoupledVarNeumannBC.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 "KokkosIntegratedBCValue.h"

class KokkosCoupledVarNeumannBC : public Moose::Kokkos::IntegratedBCValue
{
public:
  static InputParameters validParams();

  KokkosCoupledVarNeumannBC(const InputParameters & parameters);

  template <typename Derived>
  KOKKOS_FUNCTION Real computeQpResidual(const unsigned int qp, AssemblyDatum & datum) const;
  template <typename Derived>
  KOKKOS_FUNCTION Real computeQpOffDiagJacobian(const unsigned int j,
                                                const unsigned int jvar,
                                                const unsigned int qp,
                                                AssemblyDatum & datum) const;

protected:
  const Moose::Kokkos::VariableValue _coupled_var;

  const unsigned int _coupled_num;

  const Real _coef;

  const Moose::Kokkos::VariableValue _scale_factor;
};

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosCoupledVarNeumannBC::computeQpResidual(const unsigned int qp, AssemblyDatum & datum) const
{
  return -_scale_factor(datum, qp) * _coef * _coupled_var(datum, qp);
}

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosCoupledVarNeumannBC::computeQpOffDiagJacobian(const unsigned int j,
                                                    const unsigned int jvar,
                                                    const unsigned int qp,
                                                    AssemblyDatum & datum) const
{
  if (jvar == _coupled_num)
    return -_scale_factor(datum, qp) * _coef * _phi(datum, j, qp);
  else
    return 0;
}