KokkosCoupledTimeDerivative.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 "KokkosKernelValue.h"

class KokkosCoupledTimeDerivative : public Moose::Kokkos::KernelValue
{
public:
  static InputParameters validParams();

  KokkosCoupledTimeDerivative(const InputParameters & parameters);

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

protected:
  const Moose::Kokkos::VariableValue _v_dot;
  const Moose::Kokkos::Scalar<const Real> _dv_dot;
  const unsigned int _v_var;
};

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosCoupledTimeDerivative::precomputeQpResidual(const unsigned int qp,
                                                  AssemblyDatum & datum) const
{
  return _v_dot(datum, qp);
}

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosCoupledTimeDerivative::precomputeQpOffDiagJacobian(const unsigned int j,
                                                         const unsigned int jvar,
                                                         const unsigned int qp,
                                                         AssemblyDatum & datum) const
{
  if (jvar == _v_var)
    return _phi(datum, j, qp) * _dv_dot;
  else
    return 0;
}