KokkosLowerBoundNodalKernel.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 "KokkosBoundNodalKernel.h"

class KokkosLowerBoundNodalKernel final : public KokkosBoundNodalKernel<KokkosLowerBoundNodalKernel>
{
public:
  static InputParameters validParams();

  KokkosLowerBoundNodalKernel(const InputParameters & parameters);

  KOKKOS_FUNCTION Real getResidual(const unsigned int qp, ResidualDatum & datum) const;
  KOKKOS_FUNCTION Real getJacobian(const unsigned int qp, ResidualDatum & datum) const;
  KOKKOS_FUNCTION Real getOffDiagJacobian(const unsigned int jvar,
                                          const unsigned int qp,
                                          ResidualDatum & datum) const;

private:
  const Real _lower_bound;
};

KOKKOS_FUNCTION inline Real
KokkosLowerBoundNodalKernel::getResidual(const unsigned int qp, ResidualDatum & datum) const
{
  return ::Kokkos::min(_u(datum, qp), _v(datum, qp) - _lower_bound);
}

KOKKOS_FUNCTION inline Real
KokkosLowerBoundNodalKernel::getJacobian(const unsigned int qp, ResidualDatum & datum) const
{
  if (_u(datum, qp) <= _v(datum, qp) - _lower_bound)
    return 1;

  return 0;
}

KOKKOS_FUNCTION inline Real
KokkosLowerBoundNodalKernel::getOffDiagJacobian(const unsigned int jvar,
                                                const unsigned int qp,
                                                ResidualDatum & datum) const
{
  if (jvar == _v_var)
    if (_v(datum, qp) - _lower_bound < _u(datum, qp))
      return 1;

  return 0;
}