StandardExtrapolate.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: StandardExtrapolate.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,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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//
// Description: Abstract base class for StandardExtrapolate.
//
///////////////////////////////////////////////////////////////////////////////
 
#include <IncNavierStokesSolver/EquationSystems/StandardExtrapolate.h>
#include <LibUtilities/Communication/Comm.h>
 
namespace Nektar
{
NekDouble StandardExtrapolate::DuDt_Coeffs[3][4] = {
    {1.0, -1., 0.0, 0.0},
    {2.5, -4.0, 1.5, 0.0},
    {13. / 3., -9.5, 7.0, -11.0 / 6.0}};
 
/**
 * Registers the class with the Factory.
 */
std::string StandardExtrapolate::className =
    GetExtrapolateFactory().RegisterCreatorFunction(
        "Standard", StandardExtrapolate::create, "Standard");
 
StandardExtrapolate::StandardExtrapolate(
    const LibUtilities::SessionReaderSharedPtr pSession,
    Array<OneD, MultiRegions::ExpListSharedPtr> pFields,
    MultiRegions::ExpListSharedPtr pPressure, const Array<OneD, int> pVel,
    const SolverUtils::AdvectionSharedPtr advObject)
    : Extrapolate(pSession, pFields, pPressure, pVel, advObject)
{
}
 
StandardExtrapolate::~StandardExtrapolate()
{
}
 
/**
 * Function to extrapolate the new pressure boundary condition.
 * Based on the velocity field and on the advection term.
 * Acceleration term is also computed.
 * This routine is a general one for 2d and 3D application and it can be called
 * directly from velocity correction scheme. Specialisation on dimensionality is
 * redirected to the CalcNeumannPressureBCs method.
 */
void StandardExtrapolate::v_EvaluatePressureBCs(
    const Array<OneD, const Array<OneD, NekDouble>> &fields,
    const Array<OneD, const Array<OneD, NekDouble>> &N, NekDouble kinvis)
{
    m_pressureCalls++;
    if (m_HBCnumber > 0)
    {
        // Calculate non-linear and viscous BCs at current level
        // and put in m_pressureHBCs[0]
        CalcNeumannPressureBCs(fields, N, kinvis);
 
        // Extrapolate to n+1
        ExtrapolateArray(m_pressureHBCs);
 
        // Add (phi,Du/Dt) term to m_presureHBC
        AddDuDt();
 
        // Copy m_pressureHBCs to m_PbndExp
        CopyPressureHBCsToPbndExp();
    }
 
    CalcOutflowBCs(fields, kinvis);
}
 
/**
 *
 */
void StandardExtrapolate::v_SubSteppingTimeIntegration(
    const LibUtilities::TimeIntegrationSchemeSharedPtr &IntegrationScheme)
{
    if (IntegrationScheme->GetName() == "IMEX" ||
        IntegrationScheme->GetName() == "IMEXGear")
    {
        m_intSteps = IntegrationScheme->GetOrder();
    }
    else
    {
        NEKERROR(ErrorUtil::efatal,
                 "Integration method not suitable: "
                 "Options include IMEXGear or IMEXOrder{1,2,3,4}");
    }
}
 
/**
 *
 */
void StandardExtrapolate::v_SubStepSetPressureBCs(
    const Array<OneD, const Array<OneD, NekDouble>> &inarray, NekDouble Aii_DT,
    NekDouble kinvis)
{
    boost::ignore_unused(inarray, Aii_DT, kinvis);
}
 
/**
 *
 */
void StandardExtrapolate::v_SubStepAdvance(int nstep, NekDouble time)
{
    boost::ignore_unused(nstep, time);
}
 
/**
 *
 */
void StandardExtrapolate::v_SubStepSaveFields(int nstep)
{
    boost::ignore_unused(nstep);
}
 
/**
 *
 */
void StandardExtrapolate::v_MountHOPBCs(int HBCdata, NekDouble kinvis,
                                        Array<OneD, NekDouble> &Q,
                                        Array<OneD, const NekDouble> &Advection)
{
    Vmath::Svtvp(HBCdata, -kinvis, Q, 1, Advection, 1, Q, 1);
}
 
/**
 *    At the start, the newest value is stored in array[nlevels-1]
 *        and the previous values in the first positions
 *    At the end, the acceleration from BDF is stored in array[nlevels-1]
 *        and the storage has been updated to included the new value
 */
void StandardExtrapolate::v_AccelerationBDF(
    Array<OneD, Array<OneD, NekDouble>> &array)
{
    int nlevels = array.size();
    int nPts    = array[0].size();
 
    if (nPts)
    {
        // Update array
        RollOver(array);
 
        // Calculate acceleration using Backward Differentiation Formula
        Array<OneD, NekDouble> accelerationTerm(nPts, 0.0);
        if (m_pressureCalls > 2)
        {
            int acc_order = std::min(m_pressureCalls - 2, m_intSteps);
            Vmath::Smul(nPts, DuDt_Coeffs[acc_order - 1][0], array[0], 1,
                        accelerationTerm, 1);
 
            for (int i = 0; i < acc_order; i++)
            {
                Vmath::Svtvp(nPts, DuDt_Coeffs[acc_order - 1][i + 1],
                             array[i + 1], 1, accelerationTerm, 1,
                             accelerationTerm, 1);
            }
        }
        array[nlevels - 1] = accelerationTerm;
    }
}
} // namespace Nektar