VacuumConcBC.h

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#pragma once
 
#include "IntegratedBC.h"
#include "ScalarTransportBase.h"
 
class VacuumConcBC : public IntegratedBC, public ScalarTransportBase
{
public:
  VacuumConcBC(const InputParameters & parameters);
 
  static InputParameters validParams();
 
protected:
  virtual Real computeQpResidual() override;
  virtual Real computeQpJacobian() override;
 
  enum BC_TYPE
  {
    MARSHAK,
    MARK,
    MILNE
  };
 
  // Ratio of u to du/dn
  Real _alpha;
 
  // Milne vacuum boundary extrapolation coefficient
  // Derived from the exact analytical solution to the Milne problem. See MooseDocs-based
  // documentation for more information.
  Real _milne_extrapolation_coefficient = 3 * 0.710446;
};