NLBoundaryConvectiveHeatFluxIntegrator.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

#ifdef MOOSE_MFEM_ENABLED

#pragma once

#pragma once
#include "libmesh/ignore_warnings.h"
#include <mfem.hpp>
#include "libmesh/restore_warnings.h"

namespace Moose::MFEM
{
class NLBoundaryConvectiveHeatFluxIntegrator : public mfem::NonlinearFormIntegrator
{
public:
  NLBoundaryConvectiveHeatFluxIntegrator(mfem::Coefficient & k,
                                         mfem::Coefficient & dk_du,
                                         mfem::Coefficient & duinf_du,
                                         mfem::Coefficient & gf_offset,
                                         mfem::Coefficient & gf);

  virtual void AssembleElementVector(const mfem::FiniteElement & el,
                                     mfem::ElementTransformation & Tr,
                                     const mfem::Vector & elfun,
                                     mfem::Vector & elvect) override;
  virtual void AssembleElementGrad(const mfem::FiniteElement & el,
                                   mfem::ElementTransformation & Tr,
                                   const mfem::Vector & elfun,
                                   mfem::DenseMatrix & elmat) override;

protected:
  mfem::SumCoefficient _shifted_gf_coef;
  mfem::ProductCoefficient _k_uinf_coef;
  mfem::ProductCoefficient _net_flux_du_coef;
  mfem::ProductCoefficient _k_duinf_du_coef;
  mfem::ProductCoefficient _duinf_du_flux_coef;
  mfem::BoundaryLFIntegrator _inwards_flux;
  mfem::BoundaryMassIntegrator _outwards_flux;
  mfem::BoundaryMassIntegrator _jacobian_k_component;
  mfem::BoundaryMassIntegrator _jacobian_dk_du_component;
  mfem::BoundaryMassIntegrator _jacobian_duinf_du_component;
  mfem::SumIntegrator _jacobian_action{0};
};
}

#endif