FELIX_Viscosity.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 FELIX_VISCOSITY_HPP
#define FELIX_VISCOSITY_HPP

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

namespace FELIX {
template<typename EvalT, typename Traits>
class Viscosity : public PHX::EvaluatorWithBaseImpl<Traits>,
        public PHX::EvaluatorDerived<EvalT, Traits>,
        public Sacado::ParameterAccessor<EvalT, SPL_Traits> {

public:

  typedef typename EvalT::ScalarT ScalarT;

  Viscosity(const Teuchos::ParameterList& p,
            const Teuchos::RCP<Albany::Layouts>& dl);

  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;

  ScalarT homotopyParam;

  //coefficients for Glen's law
  double A; 
  double n; 

  // Input:
  PHX::MDField<ScalarT,Cell,QuadPoint,Dim,Dim> VGrad;
  PHX::MDField<MeshScalarT,Cell,QuadPoint, Dim> coordVec;

  // Output:
  PHX::MDField<ScalarT,Cell,QuadPoint> mu;

  unsigned int numQPs, numDims, numNodes;
  
  enum VISCTYPE {CONSTANT, GLENSLAW};
  VISCTYPE visc_type;
 
};
}

#endif