PHAL_LangevinNoiseTerm.hpp

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//*****************************************************************//
//    Albany 2.0:  Copyright 2012 Sandia Corporation               //
//    This Software is released under the BSD license detailed     //
//    in the file "license.txt" in the top-level Albany directory  //
//*****************************************************************//

#ifndef PHAL_LANGEVINNOISETERM_HPP
#define PHAL_LANGEVINNOISETERM_HPP

#include "Phalanx_ConfigDefs.hpp"
#include "Phalanx_Evaluator_WithBaseImpl.hpp"
#include "Phalanx_Evaluator_Derived.hpp"
#include "Phalanx_MDField.hpp"

#include "QCAD_EvaluatorTools.hpp"

// Random and Gaussian number distribution
#include <boost/random.hpp>
#include <boost/random/normal_distribution.hpp>
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/variate_generator.hpp>

namespace PHAL {

template<typename EvalT, typename Traits>
class LangevinNoiseTerm : public PHX::EvaluatorWithBaseImpl<Traits>,
       public PHX::EvaluatorDerived<EvalT, Traits>,
       public QCAD::EvaluatorTools<EvalT, Traits>
{

public:

  typedef typename EvalT::ScalarT ScalarT;

  LangevinNoiseTerm(const Teuchos::ParameterList& p);

  void postRegistrationSetup(typename Traits::SetupData d,
                      PHX::FieldManager<Traits>& vm);

  void evaluateFields(typename Traits::EvalData d);

  ScalarT& getValue(const std::string &n);


private:
 
  typedef typename EvalT::MeshScalarT MeshScalarT;

  // Input:
  PHX::MDField<ScalarT,Cell,QuadPoint> rho;
  
  // Output:
  PHX::MDField<ScalarT,Cell,QuadPoint> noiseTerm;

  unsigned int numQPs, numDims, numNodes;

  ScalarT sd;
  Teuchos::Array<int> duration;

  boost::mt19937 rng;
  Teuchos::RCP<boost::normal_distribution<double> > nd;
  Teuchos::RCP<boost::variate_generator<boost::mt19937&, boost::normal_distribution<double> > > var_nor;
//  Teuchos::RCP<boost::normal_distribution<ScalarT> > nd;
//  Teuchos::RCP<boost::variate_generator<boost::mt19937&, boost::normal_distribution<ScalarT> > > var_nor;

  // generate seed convenience function
  long seedgen();

};
}

#endif