WallRotationalBC.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: WallRotationalBC.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.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// DEALINGS IN THE SOFTWARE.
//
// Description: No-slip wall boundary condition
//
///////////////////////////////////////////////////////////////////////////////
 
#include <boost/core/ignore_unused.hpp>
 
#include "WallRotationalBC.h"
 
using namespace std;
 
namespace Nektar
{
 
std::string WallRotationalBC::classNameRotational =
    GetCFSBndCondFactory().RegisterCreatorFunction(
        "WallRotational", WallRotationalBC::create,
        "Adiabatic rotational wall boundary condition.");
 
WallRotationalBC::WallRotationalBC(
    const LibUtilities::SessionReaderSharedPtr &pSession,
    const Array<OneD, MultiRegions::ExpListSharedPtr> &pFields,
    const Array<OneD, Array<OneD, NekDouble>> &pTraceNormals,
    const Array<OneD, Array<OneD, NekDouble>> &pGridVelocity,
    const int pSpaceDim, const int bcRegion, const int cnt)
    : CFSBndCond(pSession, pFields, pTraceNormals, pGridVelocity, pSpaceDim,
                 bcRegion, cnt)
{
    m_diffusionAveWeight = 0.5;
 
    // Set up rotational boundary edge velocities
    const Array<OneD, const int> &traceBndMap = m_fields[0]->GetTraceBndMap();
 
    int eMax = m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetExpSize();
    for (int e = 0; e < eMax; ++e)
    {
        int nBCEdgePts = m_fields[0]
                             ->GetBndCondExpansions()[m_bcRegion]
                             ->GetExp(e)
                             ->GetTotPoints();
        int id2 =
            m_fields[0]->GetTrace()->GetPhys_Offset(traceBndMap[m_offset + e]);
 
        Array<OneD, NekDouble> x(nBCEdgePts, 0.0);
        Array<OneD, NekDouble> y(nBCEdgePts, 0.0);
        m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetExp(e)->GetCoords(
            x, y);
        for (int j = 0; j < nBCEdgePts; ++j)
        {
            m_gridVelocityTrace[0][id2 + j] = m_angVel * -y[j];
            m_gridVelocityTrace[1][id2 + j] = m_angVel * x[j];
        }
    }
}
 
void WallRotationalBC::v_Apply(Array<OneD, Array<OneD, NekDouble>> &Fwd,
                               Array<OneD, Array<OneD, NekDouble>> &physarray,
                               const NekDouble &time)
{
    boost::ignore_unused(time);
    int nVariables = physarray.size();
 
    // @TODO: ALE we subtract the grid velocity ? "Set u = to ug for this one" -
    // Dave
 
    int i;
    const Array<OneD, const int> &traceBndMap = m_fields[0]->GetTraceBndMap();
 
    // Take into account that for PDE based shock capturing, eps = 0 at the
    // wall. Adjust the physical values of the trace to take user defined
    // boundaries into account
    int e, id1, id2, nBCEdgePts, eMax;
 
    eMax = m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetExpSize();
 
    for (e = 0; e < eMax; ++e)
    {
        nBCEdgePts = m_fields[0]
                         ->GetBndCondExpansions()[m_bcRegion]
                         ->GetExp(e)
                         ->GetTotPoints();
        id1 =
            m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetPhys_Offset(e);
        id2 =
            m_fields[0]->GetTrace()->GetPhys_Offset(traceBndMap[m_offset + e]);
 
        // Boundary condition for epsilon term. @TODO: Is this correct, or
        // should I do E = p/(gamma -1) + 1/2*rho(u^2 +v^2 + w^2)... or
        if (nVariables == m_spacedim + 3)
        {
            Vmath::Zero(nBCEdgePts, &Fwd[nVariables - 1][id2], 1);
        }
 
        for (i = 0; i < m_spacedim; i++)
        {
            // V = -Vin
            // Vmath::Neg(nBCEdgePts, &Fwd[i+1][id2], 1);
 
            // This now does Vg * rho + Vin
            // Vmath::Vvtvp(nBCEdgePts, &m_gridVelocityTrace[i][id2], 1,
            // &Fwd[0][id2], 1, &Fwd[i+1][id2], 1, &Fwd[i+1][id2], 1);
 
            for (int j = 0; j < nBCEdgePts; ++j)
            {
                // Fwd[i+1][id2 + j] = 2 * m_gridVelocityTrace[i][id2 + j] *
                // Fwd[0][id2 + j] - Fwd[i+1][id2 + j];
                Fwd[i + 1][id2 + j] =
                    2 * m_gridVelocityTrace[i][id2 + j] * Fwd[0][id2 + j] -
                    Fwd[i + 1][id2 + j];
            }
        }
 
        // Copy boundary adjusted values into the boundary expansion
        for (i = 0; i < nVariables; ++i)
        {
            Vmath::Vcopy(nBCEdgePts, &Fwd[i][id2], 1,
                         &(m_fields[i]
                               ->GetBndCondExpansions()[m_bcRegion]
                               ->UpdatePhys())[id1],
                         1);
        }
    }
}
 
} // namespace Nektar