LinearFVPressureFluxBC.C

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

#include "LinearFVPressureFluxBC.h"

registerMooseObject("NavierStokesApp", LinearFVPressureFluxBC);

InputParameters
LinearFVPressureFluxBC::validParams()
{
  InputParameters params = LinearFVAdvectionDiffusionBC::validParams();
  params.addClassDescription(
      "Adds a fixed diffusive flux BC which can be used for the assembly of linear "
      "finite volume system and whose normal face gradient values are determined "
      "using the H/A flux. This kernel is only designed to work with advection-diffusion "
      "problems.");
  params.addRequiredParam<MooseFunctorName>("HbyA_flux", "The total HbyA face flux value.");
  params.addRequiredParam<MooseFunctorName>(
      "Ainv", "The 1/A where A is the momentum system diagonal vector.");
  return params;
}

LinearFVPressureFluxBC::LinearFVPressureFluxBC(const InputParameters & parameters)
  : LinearFVAdvectionDiffusionBC(parameters),
    _HbyA_flux(getFunctor<Real>("HbyA_flux")),
    _Ainv(getFunctor<RealVectorValue>("Ainv"))
{
}

Real
LinearFVPressureFluxBC::computeBoundaryValue() const
{
  const auto face_arg = makeCDFace(*_current_face_info);
  const auto elem_info = _current_face_type == FaceInfo::VarFaceNeighbors::ELEM
                             ? _current_face_info->elemInfo()
                             : _current_face_info->neighborInfo();
  const Real distance = computeCellToFaceDistance();

  return _var.getElemValue(*elem_info, determineState()) -
         _HbyA_flux(singleSidedFaceArg(_current_face_info), determineState()) /
             std::max(_Ainv(face_arg, determineState())(0), 1e-8) *
             distance; // We use the 0th component of Ainv. Components of Ainv are
                       // equal for most applications, and Ainv(0) has a value for 1D,2D,3D.
}

Real
LinearFVPressureFluxBC::computeBoundaryNormalGradient() const
{
  const auto face_arg = singleSidedFaceArg(_current_face_info);
  return -_HbyA_flux(face_arg, determineState()) /
         std::max(_Ainv(face_arg, determineState())(0), 1e-8);
}

Real
LinearFVPressureFluxBC::computeBoundaryValueMatrixContribution() const
{
  return 1.0;
}

Real
LinearFVPressureFluxBC::computeBoundaryValueRHSContribution() const
{
  const auto face_arg = singleSidedFaceArg(_current_face_info);
  const Real distance = computeCellToFaceDistance();

  return -_HbyA_flux(face_arg, determineState()) /
         std::max(_Ainv(face_arg, determineState())(0), 1e-8) * distance;
}

Real
LinearFVPressureFluxBC::computeBoundaryGradientMatrixContribution() const
{
  return 0.0;
}

Real
LinearFVPressureFluxBC::computeBoundaryGradientRHSContribution() const
{
  return -_HbyA_flux(singleSidedFaceArg(_current_face_info), determineState());
}