ElementDamper.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
 
#pragma once
 
// Moose Includes
#include "Damper.h"
#include "MaterialPropertyInterface.h"
#include "MooseTypes.h"
 
class SubProblem;
class SystemBase;
template <typename>
class MooseVariableFE;
typedef MooseVariableFE<Real> MooseVariable;
typedef MooseVariableFE<VectorValue<Real>> VectorMooseVariable;
class Assembly;
 
namespace libMesh
{
class QBase;
}
 
class ElementDamper : public Damper, public MaterialPropertyInterface
{
public:
  static InputParameters validParams();
 
  ElementDamper(const InputParameters & parameters);
 
  Real computeDamping();
 
  bool variableDefinedOnElement(const Elem * elem) const;
 
  MooseVariable * getVariable() { return &_var; }
 
protected:
  virtual Real computeQpDamping() = 0;
 
  THREAD_ID _tid;
  Assembly & _assembly;
 
  const Moose::CoordinateSystemType & _coord_sys;
 
  MooseVariable & _var;
 
  const Elem * const & _current_elem;
 
  unsigned int _qp;
  const MooseArray<Point> & _q_point;
  const libMesh::QBase * const & _qrule;
  const MooseArray<Real> & _JxW;
 
  const VariableValue & _u_increment;
  const VariableValue & _u;
  const VariableGradient & _grad_u;
};