Boundary2DLinLayerAver.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  |
|                                                                             |
| Copyright (C) 2017-2026 I. Marchevsky, K. Sokol, E. Ryatina, A. Kolganova   |
*-----------------------------------------------------------------------------*
| File name: Boundary2DLinLayerAver.cpp                                       |
| Info: Source code of VM2D                                                   |
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\*---------------------------------------------------------------------------*/
 
 
#include "Boundary2DLinLayerAver.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;
 
 
//Пересчет решения на интенсивность вихревого слоя //Lin
void BoundaryLinLayerAver::SolutionToFreeVortexSheetAndVirtualVortex(const Eigen::VectorXd& sol)
{
    Vortex2D virtVort;
    Point2D midNorm;
 
    double delta = W.getPassport().wakeDiscretizationProperties.delta;
 
    int nVortPerPan = W.getPassport().wakeDiscretizationProperties.minVortexPerPanel;
 
    //Очистка и резервирование памяти
    virtualWake.vecHalfGamma.clear();
    virtualWake.vecHalfGamma.reserve(afl.getNumberOfPanels() * nVortPerPan);
 
    //Очистка и резервирование памяти
    virtualWake.aflPan.clear();
    virtualWake.aflPan.reserve(afl.getNumberOfPanels() * nVortPerPan);
 
    //Очистка и резервирование памяти
    virtualWake.vtx.clear();
    virtualWake.vtx.reserve(afl.getNumberOfPanels() * nVortPerPan);
 
    //Очистка и резервирование памяти
    vortexBeginEnd.clear();
    vortexBeginEnd.reserve(afl.getNumberOfPanels());
 
    double maxG = W.getPassport().wakeDiscretizationProperties.maxGamma;
 
    std::pair<int, int> pair;
 
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
    {
        midNorm = afl.nrm[i] * delta;
 
        //число участков, на которые разбивается панель для сброса вихрей
        //определяется через наибольшее значение решения на профиле, т.е. в крайней точке
         
 
        pair.first = (int)virtualWake.vtx.size();
 
        double a = sol(i) - 0.5 * sol(afl.getNumberOfPanels() + i);
        double b = sol(i) + 0.5 * sol(afl.getNumberOfPanels() + i);
 
        if (fabs(a - b) < 1e-10)
        {
            size_t NEWnVortPerPan = (size_t)std::max((int)std::ceil(fabs(sol(i)*afl.len[i]) / maxG), nVortPerPan);
            Point2D dr = 1.0 / NEWnVortPerPan * (afl.getR(i + 1) - afl.getR(i));
 
            for (size_t j = 0; j < NEWnVortPerPan; ++j)
            {
                virtVort.r() = afl.getR(i) + dr * (j * 1.0 + 0.5) + midNorm;
                virtVort.g() = sol(i) * afl.len[i] / NEWnVortPerPan;
                virtualWake.vtx.push_back(virtVort);
 
                virtualWake.vecHalfGamma.push_back(0.5 * sol(i)  * afl.tau[i]);
                virtualWake.aflPan.push_back({ numberInPassport, i });
            }
        }
        else if (a * b >= 0.0)
        {
            size_t NEWnVortPerPan = (size_t)std::max((int)std::ceil(fabs(0.5*(a+b)*afl.len[i]) / maxG), nVortPerPan);
            std::vector<double> ds(NEWnVortPerPan+1, 0.0);
            
            for (size_t k = 1; k <= NEWnVortPerPan; ++k)
            {
                if ((a > 0) || (b > 0))
                    ds[k] = afl.len[i] / (a - b) * (a - sqrt((b*b * k + a * a*(NEWnVortPerPan - k)) / NEWnVortPerPan));
                else
                    ds[k] = afl.len[i] / (a - b) * (a + sqrt((b*b * k + a * a*(NEWnVortPerPan - k)) / NEWnVortPerPan));
            }
 
            for (size_t j = 0; j < NEWnVortPerPan; ++j)
            {
                virtVort.r() = afl.getR(i) + 0.5*(ds[j]+ds[j+1])*afl.tau[i] + midNorm;
                virtVort.g() = 0.5 * (a+b) * afl.len[i] / NEWnVortPerPan;
                virtualWake.vtx.push_back(virtVort);
 
                virtualWake.vecHalfGamma.push_back(0.5 * (a + 0.5*(ds[j] + ds[j + 1]) * (b-a)/ afl.len[i])  * afl.tau[i]);
                virtualWake.aflPan.push_back({ numberInPassport, i });
            }
        }
        else
        {
            double sast = -a * afl.len[i] / (b - a);
 
            //from 0 to sast
            {
                size_t NEWnVortPerPan = (size_t)std::max((int)std::ceil(fabs(0.5*(a + 0.0)*sast) / maxG), (int)std::ceil(nVortPerPan * sast / afl.len[i]));
                std::vector<double> ds(NEWnVortPerPan + 1, 0.0);
 
                for (size_t k = 1; k <= NEWnVortPerPan; ++k)
                {
                    if (a > 0)
                        ds[k] = sast / (a - 0.0) * (a - sqrt((a * a*(NEWnVortPerPan - k)) / NEWnVortPerPan));
                    else
                        ds[k] = sast / (a - 0.0) * (a + sqrt((a * a*(NEWnVortPerPan - k)) / NEWnVortPerPan));
                }
 
                for (size_t j = 0; j < NEWnVortPerPan; ++j)
                {
                    virtVort.r() = afl.getR(i) + 0.5*(ds[j] + ds[j + 1])*afl.tau[i] + midNorm;
                    virtVort.g() = 0.5 * (a + 0.0) * sast / NEWnVortPerPan;
                    virtualWake.vtx.push_back(virtVort);
 
                    virtualWake.vecHalfGamma.push_back(0.5 * (a + 0.5*(ds[j] + ds[j + 1]) * (0.0 - a) / sast)  * afl.tau[i]);
                    virtualWake.aflPan.push_back({ numberInPassport, i });
                }
            }
 
            double sastast = afl.len[i] - sast;
 
            //from sats to len
            {
                size_t NEWnVortPerPan = (size_t)std::max((int)std::ceil(fabs(0.5*(0.0 + b)*sastast) / maxG), (int)std::ceil(nVortPerPan * sastast / afl.len[i]));
                std::vector<double> ds(NEWnVortPerPan + 1, 0.0);
 
                for (size_t k = 1; k <= NEWnVortPerPan; ++k)
                {
                    if (b > 0)
                        ds[k] = sastast / (0.0 - b) * (0.0 - sqrt((b*b * k) / NEWnVortPerPan));
                    else
                        ds[k] = sastast / (0.0 - b) * (0.0 + sqrt((b*b * k) / NEWnVortPerPan));
                }
 
                for (size_t j = 0; j < NEWnVortPerPan; ++j)
                {
                    virtVort.r() = afl.getR(i) + sast * afl.tau[i] + 0.5*(ds[j] + ds[j + 1])*afl.tau[i] + midNorm;
                    virtVort.g() = 0.5 * (0.0 + b) * sastast / NEWnVortPerPan;
                    virtualWake.vtx.push_back(virtVort);
 
                    virtualWake.vecHalfGamma.push_back(0.5 * (0.0 + 0.5*(ds[j] + ds[j + 1]) * (b - 0.0) / sastast)  * afl.tau[i]);
                    virtualWake.aflPan.push_back({ numberInPassport, i });
                }
 
            }
        }
 
        pair.second = (int)virtualWake.vtx.size();
        vortexBeginEnd.push_back(pair);
    }
 
 
    for (size_t j = 0; j < afl.getNumberOfPanels(); ++j)
    {
        sheets.freeVortexSheet(j, 0) = sol(j);
        sheets.freeVortexSheet(j, 1) = sol(afl.getNumberOfPanels() + j);
    }
 
}//SolutionToFreeVortexSheetAndVirtualVortex(...)
 
 
 
//Генерация блока матрицы //Lin
void BoundaryLinLayerAver::FillMatrixSelf(Eigen::MatrixXd& matr, Eigen::VectorXd& lastLine, Eigen::VectorXd& lastCol)
{
    size_t np = afl.getNumberOfPanels();
 
    std::vector<double> res(4, 0.0);
 
    for (size_t i = 0; i < np; ++i)
    {
        lastCol(i) = 1.0;
        lastLine(i) = afl.len[i];
        lastCol(np + i) = 0.0;
        lastLine(np + i) = 0.0;
    }
 
 
 
    for (size_t i = 0; i < np; ++i)
    for (size_t j = 0; j < np; ++j)
    {
        res = afl.getA(2, i, afl, j);
        matr(i, j) = res[0];
        matr(i, np + j) = res[1];
        matr(np + i, j) = res[2];
        matr(np + i, np + j) = res[3];
    }
}//FillMatrixSelf(...)
 
//Генерация блока матрицы //Lin
void BoundaryLinLayerAver::FillIQSelf(std::pair<Eigen::MatrixXd, Eigen::MatrixXd>& IQ)
{
    afl.calcIQ(2, afl, IQ);
}//FillIQSelf(...)
 
 
//Генерация блока матрицы влияния от другого профиля того же типа // Lin
void BoundaryLinLayerAver::FillMatrixFromOther(const Boundary& otherBoundary, Eigen::MatrixXd& matr)
{
    size_t np = afl.getNumberOfPanels();
    size_t npOther = otherBoundary.afl.getNumberOfPanels();
 
    std::vector<double> res(4, 0.0);
 
    for (size_t i = 0; i < np; ++i)
    for (size_t j = 0; j < npOther; ++j)
    {
        res = afl.getA(2, i, otherBoundary.afl, j);
 
        matr(i, j) = res[0];
        matr(i, npOther + j) = res[1];
        matr(np + i, j) = res[2];
        matr(np + i, npOther + j) = res[3];
    }
}//FillMatrixFromOther(...)
 
void BoundaryLinLayerAver::FillIQFromOther(const Boundary& otherBoundary, std::pair<Eigen::MatrixXd, Eigen::MatrixXd>& IQ)
{
    afl.calcIQ(2, otherBoundary.afl, IQ);
}//FillIQFromOther(...)
 
 
//Вычисление скоростей в наборе точек, вызываемых наличием слоев вихрей и источников на профиле
void BoundaryLinLayerAver::CalcConvVelocityToSetOfPointsFromSheets(const WakeDataBase& pointsDb, std::vector<Point2D>& velo) const
{
    std::vector<Point2D> selfVelo(pointsDb.vtx.size());
 
#pragma warning (push)
#pragma warning (disable: 4101)
    //Локальные переменные для цикла
    Point2D velI;
    Point2D tempVel;
#pragma warning (pop)
 
#pragma omp parallel for default(none) shared(selfVelo, pointsDb, std::cout, IDPI) 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 < afl.getNumberOfPanels(); ++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 = VMlib::Lambda(p, s);
 
            Point2D u1 = 0.5 / dj.length() * VMlib::Omega(p + s, tauj, tauj) ;
 
            Point2D skos0 = -a * tauj.kcross() + lambda * tauj;
            Point2D skos1 = -a * u1.kcross() + lambda * u1 - tauj;
 
            velI += sheets.freeVortexSheet(j, 0) * skos0.kcross() + sheets.freeVortexSheet(j, 1) * skos1.kcross();
            velI += sheets.attachedVortexSheet(j, 0) * skos0.kcross() + sheets.attachedVortexSheet(j, 1) * skos1.kcross();
            velI += sheets.attachedSourceSheet(j, 0) * skos0 + sheets.attachedSourceSheet(j, 1) * skos1;
        }//for j
 
        velI *= IDPI;
        selfVelo[i] = velI;
    }//for i
 
    for (size_t i = 0; i < velo.size(); ++i)
        velo[i] += selfVelo[i];
}//CalcConvVelocityToSetOfPointsFromSheets(...)
 
#if defined(USE_CUDA)
void BoundaryLinLayerAver::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;
 
        //const size_t npnl = afl.getNumberOfPanels(); //virtualWake.vtx.size();
 
        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)
        {
            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);
 
            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];
        }
 
        //tCUDAEND = omp_get_wtime();
 
        //W.getInfo('t') << "CONV_VIRT_GPU: " << (tCUDAEND - tCUDASTART) << std::endl;
    }
}
//GPUCalcConvVelocityToSetOfPointsFromSheets(...)
#endif
 
 
//Вычисление интенсивностей присоединенного вихревого слоя и присоединенного слоя источников
void BoundaryLinLayerAver::ComputeAttachedSheetsIntensity()
{
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
    {
        oldSheets.attachedVortexSheet(i, 0) = sheets.attachedVortexSheet(i, 0);
        oldSheets.attachedVortexSheet(i, 1) = sheets.attachedVortexSheet(i, 1);
        oldSheets.attachedSourceSheet(i, 0) = sheets.attachedSourceSheet(i, 0);
        oldSheets.attachedSourceSheet(i, 1) = sheets.attachedSourceSheet(i, 1);
    }
 
    const AirfoilGeometry* oldAfl = (W.getCurrentStep() == 0) ? &afl : &W.getOldAirfoil(numberInPassport);
 
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
    {
        sheets.attachedVortexSheet(i, 0) = 0.5 * (afl.getV(i + 1) + afl.getV(i)) & afl.tau[i];
        sheets.attachedVortexSheet(i, 1) = (afl.len[i] - oldAfl->len[i]) / W.getPassport().timeDiscretizationProperties.dt;         
            
        sheets.attachedSourceSheet(i, 0) = 0.5 * (afl.getV(i + 1) + afl.getV(i)) & afl.nrm[i];
        sheets.attachedSourceSheet(i, 1) = -afl.len[i] * (afl.phiAfl - oldAfl->phiAfl) / W.getPassport().timeDiscretizationProperties.dt;
                
                 
    }
}//ComputeAttachedSheetsIntensity()
 
 
void BoundaryLinLayerAver::GetInfluenceFromVorticesToRectPanel(size_t panel, const Vortex2D* ptr, ptrdiff_t count, std::vector<double>& wakeRhs) const
{
    double& velI = wakeRhs[0];
    double& velILin = wakeRhs[1];
 
    const Point2D& posI0 = afl.getR(panel);
    const Point2D& posI1 = afl.getR(panel + 1);
    Point2D di = posI1 - posI0;
    const Point2D& taui = afl.tau[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 s = posJ - posI0;
        Point2D p = posJ - posI1;
 
        Point2D u1 = 0.5 / di.length() * VMlib::Omega(p + s, taui, taui);
 
        double alpha = VMlib::Alpha(p, s);
        double lambda = VMlib::Lambda(p, s);
 
        velI -= gamJ * alpha;
 
        velILin -= gamJ * (alpha * (u1 & taui) + lambda * (u1 & (-taui.kcross())));
    }
}//GetInfluenceFromVorticesToRectPanel(...)
 
 
//Вычисляет влияния части подряд идущих источников в области течения на прямолинейную панель для правой части
void BoundaryLinLayerAver::GetInfluenceFromSourcesToRectPanel(size_t panel, const Vortex2D* ptr, ptrdiff_t count, std::vector<double>& wakeRhs) const
{
    double& velI = wakeRhs[0];
    double& velILin = wakeRhs[1];
 
    const Point2D& posI0 = afl.getR(panel);
    const Point2D& posI1 = afl.getR(panel + 1);
    Point2D di = posI1 - posI0;
    const Point2D& taui = afl.tau[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 s = posJ - posI0;
        Point2D p = posJ - posI1;
 
        Point2D u1 = 0.5 / di.length() * VMlib::Omega(p + s, taui, taui);
 
        double alpha = VMlib::Alpha(p, s);
        double lambda = VMlib::Lambda(p, s);
 
        velI -= gamJ * lambda;
 
        velILin -= gamJ * (alpha * (u1 &  taui.kcross()) + lambda * (u1 & taui) - 1.0);
    }
 
}//GetInfluenceFromSourcesToRectPanel(...)
 
//Вычисление влияния слоя источников конкретной прямолинейной панели на вихрь в области течения
void BoundaryLinLayerAver::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);
 
    Point2D u1 = 0.5 / dj.length()* VMlib::Omega(p + s, tauj, tauj);
 
    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 * u1.kcross() + lambda * u1 - tauj);
    vel *= IDPI;
}// GetInfluenceFromSourceSheetAtRectPanelToVortex(...)
 
//Вычисление влияния вихревых слоев (свободный + присоединенный) конкретной прямолинейной панели на вихрь в области течения
void BoundaryLinLayerAver::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);
 
    Point2D u1 = 0.5 / dj.length()* VMlib::Omega(p + s, tauj, tauj);
 
    double lambda;
    if ((s.length2() > 1e-16) && (p.length2() > 1e-16))
        lambda = VMlib::Lambda(p, s);
    else
        lambda = 0.0;
 
    vel += sheets.freeVortexSheet(panel, 0) * (lambda * u1.kcross() - tauj.kcross());
    vel += sheets.attachedVortexSheet(panel, 0) * (lambda * u1.kcross() - tauj.kcross());
    vel *= IDPI;
}// GetInfluenceFromVortexSheetAtRectPanelToVortex(...)
 
//Вычисляет влияния набегающего потока на прямолинейную панель для правой части
void BoundaryLinLayerAver::GetInfluenceFromVInfToRectPanel(std::vector<double>& vInfRhs) const
{
    size_t np = afl.getNumberOfPanels();
 
    vInfRhs.resize(2 * np);
 
#pragma omp parallel for default(none) shared(vInfRhs, np)
    for (int i = 0; i < np; ++i)
    {
        vInfRhs[i] = afl.tau[i] & W.getV0();
        vInfRhs[np + i] = 0;
    }
}// GetInfluenceFromVInfToRectPanel(...)