Boundary2DVortexCollocN.cpp

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/*--------------------------------*- VM2D -*-----------------*---------------*\
| ##  ## ##   ##  ####  #####   |                            | Version 1.14   |
| ##  ## ### ### ##  ## ##  ##  |  VM2D: Vortex Method       | 2026/03/06     |
| ##  ## ## # ##    ##  ##  ##  |  for 2D Flow Simulation    *----------------*
|  ####  ##   ##   ##   ##  ##  |  Open Source Code                           |
|   ##   ##   ## ###### #####   |  https://www.github.com/vortexmethods/VM2D  |
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| Copyright (C) 2017-2026 I. Marchevsky, K. Sokol, E. Ryatina, A. Kolganova   |
*-----------------------------------------------------------------------------*
| File name: Boundary2DVortexCollocN.cpp                                      |
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\*---------------------------------------------------------------------------*/
 
 
#include "Boundary2DVortexCollocN.h"
 
#include "Airfoil2D.h"
#include "MeasureVP2D.h"
#include "Mechanics2D.h"
#include "StreamParser.h"
#include "Velocity2D.h"
#include "Wake2D.h"
#include "World2D.h"
 
using namespace VM2D;
 
//Конструктор
BoundaryVortexCollocN::BoundaryVortexCollocN(const World2D& W_, size_t numberInPassport_) :
    Boundary(W_, numberInPassport_, 1) 
    {
        c.reserve(afl.getNumberOfPanels());
        for (size_t i=0; i < afl.getNumberOfPanels(); ++i)
            c.push_back(0.5*(afl.getR(i)+afl.getR(i+1)));
    };
 
 
//Пересчет решения на интенсивность вихревого слоя
void BoundaryVortexCollocN::SolutionToFreeVortexSheetAndVirtualVortex(const Eigen::VectorXd& sol)
{
    Vortex2D virtVort;
    Point2D midNorm;
 
    size_t np = afl.getNumberOfPanels();
 
    double delta = W.getPassport().wakeDiscretizationProperties.delta;
    
    int nVortPerPan = W.getPassport().wakeDiscretizationProperties.minVortexPerPanel;
 
    //Очистка и резервирование памяти
    virtualWake.vecHalfGamma.clear();
    virtualWake.vecHalfGamma.reserve(np * nVortPerPan);
 
    //Очистка и резервирование памяти
    virtualWake.aflPan.clear();
    virtualWake.aflPan.reserve(np * nVortPerPan);
 
    //Резервирование памяти
    virtualWake.vtx.clear();
    virtualWake.vtx.reserve(np * nVortPerPan);
 
    //Очистка и резервирование памяти
    vortexBeginEnd.clear();
    vortexBeginEnd.reserve(np);
 
    double maxG = W.getPassport().wakeDiscretizationProperties.maxGamma;
 
    std::pair<int, int> pair; 
 
    for (size_t i = 0; i < np; ++i)
    {
        midNorm = afl.nrm[i] * delta;
        size_t iNext = (i < np-1) ? i + 1 : 0;
        size_t iPrev = (i > 0) ? i - 1 : np - 1;
 
        double Gamma = (sol(i) / (afl.len[iPrev] + afl.len[i]) + sol(iNext) / (afl.len[iNext] + afl.len[i])) * afl.len[i];
        
        size_t NEWnVortPerPan = std::max(static_cast<int>(std::ceil(fabs(Gamma) / W.getPassport().wakeDiscretizationProperties.maxGamma)), nVortPerPan);
        
        pair.first = (int)virtualWake.vtx.size();
 
 
        Point2D dr = 1.0 / NEWnVortPerPan * (afl.getR(i + 1) - afl.getR(i));
        virtVort.g() = Gamma / NEWnVortPerPan;
        
        for (size_t j = 0; j < NEWnVortPerPan; ++j)
        {
            virtVort.r() = afl.getR(i) + (0.5 + j) * dr + delta * afl.nrm[i]; 
            
            virtualWake.vtx.push_back(virtVort);
 
            virtualWake.vecHalfGamma.push_back(0.5 * Gamma / afl.len[i] * afl.tau[i]); 
            virtualWake.aflPan.push_back({ numberInPassport, i });
        }
 
        pair.second = (int)virtualWake.vtx.size();
        vortexBeginEnd.push_back(pair);
 
        sheets.freeVortexSheet(i, 0) = Gamma / afl.len[i];      
    }
    
 
}//SolutionToFreeVortexSheetAndVirtualVortex(...)
 
 
//Генерация блока матрицы
void BoundaryVortexCollocN::FillMatrixSelf(Eigen::MatrixXd& matr, Eigen::VectorXd& lastLine, Eigen::VectorXd& lactCol)
{
    size_t np = afl.getNumberOfPanels();
        
    for (size_t i = 0; i < np; ++i)
    {
        lactCol(i) = 1.0;
        lastLine(i) = 1.0;
    }
 
    
#pragma omp parallel for shared(matr)
    for (int i = 0; i < np; ++i)
        for (size_t j = 0; j < np; ++j)
        {                       
            matr(i, j) = -(afl.tau[i] & (c[i]-afl.getR(j)) ) * IDPI / (c[i]-afl.getR(j)).length2();
        }
}//FillMatrixSelf(...)
 
void BoundaryVortexCollocN::FillIQSelf(std::pair<Eigen::MatrixXd, Eigen::MatrixXd>& IQ)
{
    //afl.calcIQ(1, afl, IQ);
}//FillIQSelf(...)
 
//Генерация блока матрицы влияния от другого профиля того же типа
void BoundaryVortexCollocN::FillMatrixFromOther(const Boundary& otherBoundary, Eigen::MatrixXd& matr)
{
#pragma omp parallel for shared(matr)
    for (int i = 0; i < afl.getNumberOfPanels(); ++i)
    for (size_t j = 0; j < otherBoundary.afl.getNumberOfPanels(); ++j)      
    {
        
        matr(i, j) = -(afl.tau[i] & (c[i]-otherBoundary.afl.getR(j)) ) * IDPI / (c[i]-otherBoundary.afl.getR(j)).length2();
    }       
}//FillMatrixFromOther(...)
 
 
void BoundaryVortexCollocN::FillIQFromOther(const Boundary& otherBoundary, std::pair<Eigen::MatrixXd, Eigen::MatrixXd>& IQ)
{
    //afl.calcIQ(1, otherBoundary.afl, IQ);
}//FillIQFromOther(...)
 
 
//Вычисление скоростей в наборе точек, вызываемых наличием слоев вихрей и источников на профиле
void BoundaryVortexCollocN::CalcConvVelocityToSetOfPointsFromSheets(const WakeDataBase& pointsDb, std::vector<Point2D>& velo) const
{   
    std::vector<Point2D> selfVelo(pointsDb.vtx.size()); 
 
    double cft = IDPI;   
 
#pragma warning (push)
#pragma warning (disable: 4101)
    //Локальные переменные для цикла
    Point2D velI;
    Point2D tempVel;
    //double dst2eps, dst2;
#pragma warning (pop)
 
#pragma omp parallel for default(none) shared(selfVelo, pointsDb, cft, std::cout) private(velI, tempVel)
    for (int i = 0; i < pointsDb.vtx.size(); ++i)
    {
        velI.toZero();
 
        const Point2D& posI = pointsDb.vtx[i].r();
        
        for (size_t j = 0; j < sheets.getSheetSize(); ++j)
        {
            Point2D dj = afl.getR(j + 1) - afl.getR(j);
            Point2D tauj = dj.unit();
 
            Point2D s = posI - afl.getR(j);
            Point2D p = posI - afl.getR(j + 1);
 
            double a = VMlib::Alpha(p, s);
 
            double lambda;
            if ( (s.length2() > 1e-16) && (p.length2() > 1e-16) )
                lambda = VMlib::Lambda(p, s);
            else
                lambda = 0.0;
 
            Point2D skos = -a * tauj.kcross() + lambda * tauj;
 
            velI += sheets.freeVortexSheet(j, 0) * skos.kcross();
            velI += sheets.attachedVortexSheet(j, 0) * skos.kcross();
            velI += sheets.attachedSourceSheet(j, 0) * skos;
        }//for j
        
        velI *= cft;
        selfVelo[i] = velI;
 
    }//for i
 
    for (size_t i = 0; i < velo.size(); ++i)
        velo[i] += selfVelo[i];
}//CalcConvVelocityToSetOfPointsFromSheets(...)
 
 
#if defined(USE_CUDA)
void BoundaryVortexCollocN::GPUCalcConvVelocityToSetOfPointsFromSheets(const WakeDataBase& pointsDb, std::vector<Point2D>& velo) const
{   
    if (afl.numberInPassport == 0)
    {
        const size_t npt = pointsDb.vtx.size();
        double*& dev_ptr_pt = pointsDb.devVtxPtr;
 
        size_t npnl = afl.getNumberOfPanels();
        for (size_t q = 1; q < W.getNumberOfAirfoil(); ++q)
            npnl += W.getAirfoil(q).getNumberOfPanels();
 
        double*& dev_ptr_r = afl.devRPtr;
        double*& dev_ptr_freeVortexSheet = afl.devFreeVortexSheetPtr;
        double*& dev_ptr_attachedVortexSheet = afl.devAttachedVortexSheetPtr;
        double*& dev_ptr_attachedSourceSheet = afl.devAttachedSourceSheetPtr;
 
        double*& dev_ptr_freeVortexSheetLin = afl.devFreeVortexSheetLinPtr;
        double*& dev_ptr_attachedVortexSheetLin = afl.devAttachedVortexSheetLinPtr;
        double*& dev_ptr_attachedSourceSheetLin = afl.devAttachedSourceSheetLinPtr;
 
        std::vector<Point2D>& Vel = velo;       
        std::vector<Point2D> newV(npt);
        double*& dev_ptr_vel = pointsDb.devVelPtr;
        double eps2 = W.getPassport().wakeDiscretizationProperties.eps2;
 
        //Явная синхронизация слоев не нужна, т.к. она выполняется в Gpu::RefreshAfls() 
        if (npt > 0)
        {
            //double tt1 = omp_get_wtime();
            cuCalculateConvVeloWakeFromVirtual(npt, dev_ptr_pt, npnl, dev_ptr_r, \
                dev_ptr_freeVortexSheet, dev_ptr_freeVortexSheetLin, \
                dev_ptr_attachedVortexSheet, dev_ptr_attachedVortexSheetLin, \
                dev_ptr_attachedSourceSheet, dev_ptr_attachedSourceSheetLin, \
                dev_ptr_vel, eps2);         
            //double tt2 = omp_get_wtime();
            //std::cout << "SHEET: " << tt2 - tt1 << std::endl;
 
            W.getCuda().CopyMemFromDev<double, 2>(npt, dev_ptr_vel, (double*)newV.data());
 
 
            for (size_t q = 0; q < Vel.size(); ++q)
                Vel[q] += newV[q];
        }
    }
}
//GPUCalcConvVelocityToSetOfPointsFromSheets(...)
#endif
 
 
//Вычисление интенсивностей присоединенного вихревого слоя и присоединенного слоя источников
void BoundaryVortexCollocN::ComputeAttachedSheetsIntensity()
{
 
    for (size_t i = 0; i < sheets.getSheetSize(); ++i)
    {
        oldSheets.attachedVortexSheet(i, 0) = sheets.attachedVortexSheet(i, 0);
        oldSheets.attachedSourceSheet(i, 0) = sheets.attachedSourceSheet(i, 0);
    }
 
    for (size_t i = 0; i < sheets.getSheetSize(); ++i)
    {
        sheets.attachedVortexSheet(i, 0) = 0.5 * (afl.getV(i) + afl.getV(i + 1)) & afl.tau[i];
        sheets.attachedSourceSheet(i, 0) = 0.5 * (afl.getV(i) + afl.getV(i + 1)) & afl.nrm[i];
    }   
}//ComputeAttachedSheetsIntensity()
 
 
//Вычисляет влияния части подряд идущих вихрей из вихревого следа на прямолинейную панель для правой части
void BoundaryVortexCollocN::GetInfluenceFromVorticesToRectPanel(size_t panel, const Vortex2D* ptr, ptrdiff_t count, std::vector<double>& wakeRhs) const
{
    double& velI = wakeRhs[0];
 
    const Point2D& posI = c[panel];
    
    for (size_t it = 0; it != count; ++it)
    {
        const Vortex2D& vt = ptr[it];
 
        const Point2D& posJ = vt.r();
        const double& gamJ = vt.g();
 
        Point2D d = posI - posJ;
        //std::cout << "d = " << d << std::endl;
 
        velI -= (gamJ * afl.len[panel] / std::max(d.length2(), W.getPassport().wakeDiscretizationProperties.eps2)) * (afl.tau[panel] & d);
    }
}// GetInfluenceFromVorticesToRectPanel(...)
 
 
 
//Вычисляет влияния части подряд идущих источников в области течения на прямолинейную панель для правой части
void BoundaryVortexCollocN::GetInfluenceFromSourcesToRectPanel(size_t panel, const Vortex2D* ptr, ptrdiff_t count, std::vector<double>& wakeRhs) const
{
    double& velI = wakeRhs[0];
 
    const Point2D& posI = 0.5 * (afl.getR(panel) + afl.getR(panel + 1));
 
    for (size_t it = 0; it != count; ++it)
    {
        const Vortex2D& vt = ptr[it];
 
        const Point2D& posJ = vt.r();
        const double& gamJ = vt.g();
 
        Point2D d = posI - posJ;
 
        velI += (gamJ * afl.len[panel] / std::max(d.length2(), W.getPassport().wakeDiscretizationProperties.eps2)) * (afl.nrm[panel] & d);
    }   
}// GetInfluenceFromSourcesToRectPanel(...)
 
 
//Вычисление влияния слоя источников конкретной прямолинейной панели на вихрь в области течения
void BoundaryVortexCollocN::GetInfluenceFromSourceSheetAtRectPanelToVortex(size_t panel, const Vortex2D& ptr, Point2D& vel) const
{       
    vel.toZero();
 
    const Point2D& posI = ptr.r();
 
    Point2D dj = afl.getR(panel + 1) - afl.getR(panel);
    Point2D tauj = dj.unit();
 
    Point2D s = posI - afl.getR(panel);
    Point2D p = posI - afl.getR(panel + 1);
 
    double a = VMlib::Alpha(p, s);
 
    double lambda;
    if ((s.length2() > 1e-16) && (p.length2() > 1e-16))
        lambda = VMlib::Lambda(p, s);
    else
        lambda = 0.0;
 
    vel += sheets.attachedSourceSheet(panel, 0) * (-a * tauj.kcross() + lambda * tauj);
}// GetInfluenceFromSourceSheetAtRectPanelToVortex(...)
 
//Вычисление влияния вихревых слоев (свободный + присоединенный) конкретной прямолинейной панели на вихрь в области течения
void BoundaryVortexCollocN::GetInfluenceFromVortexSheetAtRectPanelToVortex(size_t panel, const Vortex2D& ptr, Point2D& vel) const
{
    vel.toZero();
 
    const Point2D& posI = ptr.r();
 
    Point2D dj = afl.getR(panel + 1) - afl.getR(panel);
    Point2D tauj = dj.unit();
 
    Point2D s = posI - afl.getR(panel);
    Point2D p = posI - afl.getR(panel + 1);
    double a = VMlib::Alpha(p, s);
 
    double lambda;
    if ((s.length2() > 1e-16) && (p.length2() > 1e-16))
        lambda = VMlib::Lambda(p, s);
    else
        lambda = 0.0;
 
    Point2D skos = -a * tauj.kcross() + lambda * tauj;
 
    vel += sheets.freeVortexSheet(panel, 0) * skos.kcross();
    vel += sheets.attachedVortexSheet(panel, 0) * skos.kcross();
 
}// GetInfluenceFromVortexSheetAtRectPanelToVortex(...)
 
 
//Вычисляет влияния набегающего потока на прямолинейную панель для правой части
void BoundaryVortexCollocN::GetInfluenceFromVInfToRectPanel(std::vector<double>& vInfRhs) const
{
    size_t np = afl.getNumberOfPanels();
 
#pragma omp parallel for default(none) shared(vInfRhs, np)
    for (int i = 0; i < np; ++i)    
        vInfRhs[i] = afl.nrm[i] & W.getV0();
    
}// GetInfluenceFromVInfToRectPanel(...)