ShallowWaterSystem.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File ShallowWaterSystem.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
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// Description: Generic timestepping for shallow water solvers
//
///////////////////////////////////////////////////////////////////////////////

#include <iostream>

#include <ShallowWaterSolver/EquationSystems/ShallowWaterSystem.h>

using namespace std;

namespace Nektar
{
    /**
     * @class ShallowWaterSystem
     *
     * Provides the underlying timestepping framework for shallow water flow solvers
     * including the general timestepping routines. This class is not intended
     * to be directly instantiated, but rather is a base class on which to
     * define shallow water solvers, e.g. SWE, Boussinesq, linear and nonlinear versions.
     *
     * For details on implementing unsteady solvers see
     * \ref sectionADRSolverModuleImplementation 
     */

    /**
     * Processes SolverInfo parameters from the session file and sets up
     * timestepping-specific code.
     * @param   pSession        Session object to read parameters from.
     */

   string ShallowWaterSystem::className = 
        SolverUtils::GetEquationSystemFactory().RegisterCreatorFunction(
            "ShallowWaterSystem", 
            ShallowWaterSystem::create, 
            "Auxiliary functions for the shallow water system.");
    

    ShallowWaterSystem::ShallowWaterSystem(
            const LibUtilities::SessionReaderSharedPtr& pSession)
        : UnsteadySystem(pSession)
    {
    }

    void ShallowWaterSystem::v_InitObject()
    {
        UnsteadySystem::v_InitObject();

        // if discontinuous Galerkin determine numerical flux to use
    if (m_projectionType == MultiRegions::eDiscontinuous)
      {
        ASSERTL0(m_session->DefinesSolverInfo("UPWINDTYPE"),
             "No UPWINDTYPE defined in session.");
      }
           
     // Set up locations of velocity vector.
     m_vecLocs = Array<OneD, Array<OneD, NekDouble> >(1);
     m_vecLocs[0] = Array<OneD, NekDouble>(m_spacedim);
     for (int i = 0; i < m_spacedim; ++i)
     {
            m_vecLocs[0][i] = 1 + i;
     }

    // Load generic input parameters
        m_session->LoadParameter("IO_InfoSteps", m_infosteps, 0);

    // Load acceleration of gravity
    m_session->LoadParameter("Gravity", m_g, 9.81);

    // input/output in primitive variables
    m_primitive = true;

        EvaluateWaterDepth();
    
    m_constantDepth = true;
    NekDouble depth = m_depth[0];
    for (int i = 0; i < GetTotPoints(); ++i)
      {
        if (m_depth[i] != depth)
          {
        m_constantDepth = false;
        break;
          }
      }

    // Compute the bottom slopes
    int nq = GetTotPoints();
    if (m_constantDepth != true)
      {
        m_bottomSlope = Array<OneD, Array<OneD, NekDouble> >(m_spacedim);
        for (int i = 0; i < m_spacedim; ++i)
          {
        m_bottomSlope[i] = Array<OneD, NekDouble>(nq);
        m_fields[0]->PhysDeriv(MultiRegions::DirCartesianMap[i],m_depth,m_bottomSlope[i]);
        Vmath::Neg(nq,m_bottomSlope[i],1);
          }
      }

    EvaluateCoriolis();

    }


    /**
     *
     */
    ShallowWaterSystem::~ShallowWaterSystem()
    {
    }


    void ShallowWaterSystem::v_GenerateSummary(SolverUtils::SummaryList& s)
    {
        UnsteadySystem::v_GenerateSummary(s);
    if (m_constantDepth == true)
      {
        SolverUtils::AddSummaryItem(s, "Depth", "constant");
      }
    else
      {
        SolverUtils::AddSummaryItem(s, "Depth", "variable");
      }

    
    }

   void ShallowWaterSystem::v_PrimitiveToConservative()
  {
    ASSERTL0(false, "This function is not implemented for this equation.");
  }
  
  void ShallowWaterSystem::v_ConservativeToPrimitive()
  {
    ASSERTL0(false, "This function is not implemented for this equation.");
  }

  void ShallowWaterSystem::EvaluateWaterDepth(void)
  {
    EvaluateFunction("d",m_depth,"WaterDepth");
  }
  
  
  void ShallowWaterSystem::EvaluateCoriolis(void)
  {
    EvaluateFunction("f",m_coriolis,"Coriolis");
  }

  void ShallowWaterSystem::CopyBoundaryTrace(const Array<OneD, NekDouble>&Fwd, Array<OneD, NekDouble>&Bwd)
  {

    int cnt = 0;
    // loop over Boundary Regions
    for(int bcRegion = 0; bcRegion < m_fields[0]->GetBndConditions().num_elements(); ++bcRegion)
      { 
    
    // Copy the forward trace of the field to the backward trace
        int e, id2, npts;
        
        for (e = 0; e < m_fields[0]->GetBndCondExpansions()[bcRegion]
                 ->GetExpSize(); ++e)
        {
            npts = m_fields[0]->GetBndCondExpansions()[bcRegion]->
                GetExp(e)->GetTotPoints();
            id2  = m_fields[0]->GetTrace()->GetPhys_Offset(
                        m_fields[0]->GetTraceMap()->
                                    GetBndCondCoeffsToGlobalCoeffsMap(cnt+e));
    
        Vmath::Vcopy(npts, &Fwd[id2], 1, &Bwd[id2], 1);
    }

    cnt +=m_fields[0]->GetBndCondExpansions()[bcRegion]->GetExpSize();
      }
  }

}