MassFluxPenaltyBC.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
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//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
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//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "ADIntegratedBC.h"

class Function;

/*
 * The external face pair to the MassFluxPenalty DGKernel. The DGKernel adds a residual/Jacobian
 * contribution proportional to the jump in velocity at an internal face. This object running on the
 * external boundary adds a residual proportional to the jump between the finite element solution
 * and the Dirichlet value (which this object currently requires). These jump terms are added in
 * order to produce an augmented Lagrange like perturbation for DG discretizations
 */
class MassFluxPenaltyBC : public ADIntegratedBC
{
public:
  static InputParameters validParams();

  MassFluxPenaltyBC(const InputParameters & parameters);

  virtual void computeResidual() override;

protected:
  virtual ADReal computeQpResidual() override;

  const ADVariableValue & _vel_x;
  const ADVariableValue & _vel_y;
  const unsigned short _comp;
  const bool _matrix_only;
  const Real _gamma;
  const Function * const _dirichlet_func;
};