text: // @HEADER
  // ***********************************************************************
  //
  //           Panzer: A partial differential equation assembly
  //       engine for strongly coupled complex multiphysics systems
  //                 Copyright (2011) Sandia Corporation
  //
  // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  // the U.S. Government retains certain rights in this software.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  // 1. Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //
  // 2. Redistributions in binary form must reproduce the above copyright
  // notice, this list of conditions and the following disclaimer in the
  // documentation and/or other materials provided with the distribution.
  //
  // 3. Neither the name of the Corporation nor the names of the
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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  // Questions? Contact Roger P. Pawlowski (rppawlo@sandia.gov) and
  // Eric C. Cyr (eccyr@sandia.gov)
  // ***********************************************************************
  // @HEADER
  
  #ifndef PANZER_CONVECTION_T_HPP
  #define PANZER_CONVECTION_T_HPP
  
  #include "Panzer_Workset.hpp"
  #include "Panzer_IntegrationRule.hpp"
  
  namespace user_app {
  
  //**********************************************************************
  template<typename EvalT, typename Traits>
  Convection<EvalT, Traits>::
  Convection(
    const Teuchos::ParameterList& p)
  {
    using std::string;
    using Teuchos::RCP;
    using PHX::DataLayout;
    using PHX::MDField;
    using panzer::IntegrationRule;
  
    RCP<IntegrationRule> ir = p.get< RCP<IntegrationRule> >("IR");
  
    RCP<DataLayout> scalar = ir->dl_scalar;
    RCP<DataLayout> vector = ir->dl_vector;
    
    conv = MDField<ScalarT,Cell,Point>(p.get<string>("Operator Name"),scalar);
  
    a = MDField<const ScalarT,Cell,Point,Dim>(p.get<string>("A Name"),vector);
  
    grad_x = 
      MDField<const ScalarT,Cell,Point,Dim>(p.get<string>("Gradient Name"),vector);
  
    multiplier = p.get<double>("Multiplier");
  
    this->addEvaluatedField(conv);
  
    this->addDependentField(a);
    this->addDependentField(grad_x);
    
    std::string n = "Convection: " + conv.fieldTag().name();
    this->setName(n);
  }
  
  //**********************************************************************
  template<typename EvalT, typename Traits>
  void
  Convection<EvalT, Traits>::
  evaluateFields(
    typename Traits::EvalData workset)
  { 
    typedef typename PHX::MDField<ScalarT,Cell,Point>::size_type size_type;
    
    for (panzer::index_t cell = 0; cell < workset.num_cells; ++cell) {    
      for (size_type point = 0; point < conv.extent(1); ++point) {
        
        conv(cell,point) = 0.0;
  	
        for (size_type dim = 0; dim < a.extent(2); ++dim)
  	conv(cell,point) += a(cell,point,dim) * grad_x(cell,point,dim);
        
        conv(cell,point) *= multiplier;
        
      }
    }
  
  }
  
  //**********************************************************************
  
  }
  
  #endif
  