MassFreeBC.C

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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

#include "MassFreeBC.h"
#include "MooseMesh.h"

registerMooseObject("NavierStokesApp", MassFreeBC);

InputParameters
MassFreeBC::validParams()
{
  InputParameters params = IntegratedBC::validParams();
  params.addRequiredCoupledVar("vel_x", "x-component of velocity");
  params.addCoupledVar("vel_y", "y-component of velocity");
  params.addCoupledVar("vel_z", "z-component of velocity");
  params.addClassDescription(
      "Implements free advective flow boundary conditions for the mass equation.");
  return params;
}

MassFreeBC::MassFreeBC(const InputParameters & parameters)
  : IntegratedBC(parameters),
    _vel_x(coupledValue("vel_x")),
    _vel_y(_mesh.dimension() >= 2 ? coupledValue("vel_y") : _zero),
    _vel_z(_mesh.dimension() >= 3 ? coupledValue("vel_z") : _zero)
{
}

Real
MassFreeBC::computeQpResidual()
{
  RealVectorValue vel_vec(_vel_x[_qp], _vel_y[_qp], _vel_z[_qp]);
  return _u[_qp] * vel_vec * _normals[_qp] * _test[_i][_qp];
}