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).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
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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,
    const SpatialDomains::MeshGraphSharedPtr &pGraph)
    : UnsteadySystem(pSession, pGraph)
{
}
 
void ShallowWaterSystem::v_InitObject(bool DeclareFields)
{
    UnsteadySystem::v_InitObject(DeclareFields);
 
    // 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)
{
    GetFunction("WaterDepth")->Evaluate("d", m_depth);
}
 
void ShallowWaterSystem::EvaluateCoriolis(void)
{
    GetFunction("Coriolis")->Evaluate("f", m_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().size();
         ++bcRegion)
    {
        if (m_fields[0]
                ->GetBndConditions()[bcRegion]
                ->GetBoundaryConditionType() == SpatialDomains::ePeriodic)
        {
            continue;
        }
 
        // 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()->GetBndCondIDToGlobalTraceID(cnt +
                                                                        e));
 
            Vmath::Vcopy(npts, &Fwd[id2], 1, &Bwd[id2], 1);
        }
 
        cnt += m_fields[0]->GetBndCondExpansions()[bcRegion]->GetExpSize();
    }
}
 
} // namespace Nektar