Mechanics2D.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: Mechanics2D.cpp                                                  |
| Info: Source code of VM2D                                                   |
|                                                                             |
| This file is part of VM2D.                                                  |
| VM2D is free software: you can redistribute it and/or modify it             |
| under the terms of the GNU General Public License as published by           |
| the Free Software Foundation, either version 3 of the License, or           |
| (at your option) any later version.                                         |
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| VM2D is distributed in the hope that it will be useful, but WITHOUT         |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       |
| FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License       |
| for more details.                                                           |
|                                                                             |
| You should have received a copy of the GNU General Public License           |
| along with VM2D.  If not, see <http://www.gnu.org/licenses/>.               |
\*---------------------------------------------------------------------------*/
 
 
#include "Mechanics2D.h"
 
#include "Airfoil2D.h"
#include "Boundary2D.h"
#include "MeasureVP2D.h"
#include "StreamParser.h"
#include "Velocity2D.h"
#include "Wake2D.h"
#include "World2D.h"
 
 
 
using namespace VM2D;
 
//Конструктор
Mechanics::Mechanics(const World2D& W_, size_t numberInPassport_, bool isMoves_, bool isDeform_)
    :
    W(W_),
    numberInPassport(numberInPassport_),
    afl(W_.getNonConstAirfoil(numberInPassport_)),
    boundary(W_.getBoundary(numberInPassport_)),
    virtVortParams(W_.getVelocity().virtualVortexesParams[numberInPassport_]),
 
    Vcm0({ 0.0, 0.0 }),
    Wcm0(0.0),
    Rcm0({ 0.0, 0.0 }),
    Phi0(0.0),
 
    Wcm(0.0),
    Phi(0.0),
 
    WcmOld(0.0),
    PhiOld(0.0),
 
    /*Vcm0(Vcm0_),
    Wcm0(Wcm0_),
    Rcm0(Rcm0_),
    Phi0(Phi0_),*/
 
    isMoves(isMoves_), 
    isDeform(isDeform_), 
 
    hydroDynamForce({0.0, 0.0}),
    hydroDynamMoment(0.0),
    viscousForce({ 0.0, 0.0 }),
    viscousMoment(0.0)
 
{
    ReadParametersFromDictionary();
}; 
 
//Задание начального положения и начальной скорости
void Mechanics::Initialize(Point2D Vcm0_, Point2D Rcm0_, double Wcm0_, double Phi0_)
{
    Vcm0 = Vcm0_;
    Wcm0 = Wcm0_;
    Rcm0 = Rcm0_;
    Phi0 = Phi0_;
 
    Vcm = Vcm0;
    Wcm = Wcm0;
    Rcm = Rcm0;
    Phi = Phi0;
    VcmOld = Vcm0;
    WcmOld = Wcm0;
    RcmOld = Rcm0;
    PhiOld = Phi0;
 
    circulation = 2.0 * afl.area * Wcm;
    circulationOld = circulation;
 
    afl.Move(Rcm - W.getAirfoil(numberInPassport).rcm);
    afl.Rotate(Phi - W.getAirfoil(numberInPassport).phiAfl);
}//Initialize(...)
 
//Парсинг списка параметров механической системы
void Mechanics::ReadParametersFromDictionary()
{
    std::stringstream ss(W.getPassport().airfoilParams[afl.numberInPassport].mechanicalSystemParameters);
    
    mechParamsParser.reset(new VMlib::StreamParser(W.getInfo(), "mechanical parser", ss));
}//ReadParametersFromDictionary()
 
 
// Генерация заголовка файла нагрузок
void Mechanics::GenerateForcesHeader()
{
    std::stringstream forceFileName, forceFileNameCsv;
    forceFileName << W.getPassport().dir << "forces-airfoil-" << numberInPassport;
    forceFileNameCsv << W.getPassport().dir << "forces-airfoil-" << numberInPassport << ".csv";
 
    std::ofstream newForcesFile(forceFileName.str());
    std::ofstream newForcesFileCsv(forceFileNameCsv.str());
 
    VMlib::PrintLogoToTextFile(newForcesFile, forceFileName.str(), "Hydrodynamic loads for the airfoil " + W.getPassport().airfoilParams[numberInPassport].fileAirfoil);
 
    if (!W.getPassport().calcCoefficients)
        VMlib::PrintHeaderToTextFile(newForcesFile, "currentStep     currentTime     Fx     Fy     Mz     Ftaux     Ftauy     Mtau");
    else
        VMlib::PrintHeaderToTextFile(newForcesFile, "currentStep     currentTime     CFx    CFy    CMz    CFtaux    CFtauy    CMtau");
 
    if (!W.getPassport().calcCoefficients)
        newForcesFileCsv << "step,time,Fx,Fy,Mz,Ftaux,Ftauy,Mtau";
    else
        newForcesFileCsv << "step,time,CFx,CFy,CMz,CFtaux,CFtauy,CMtau";
 
    newForcesFile.close();
    newForcesFile.clear();
 
    newForcesFileCsv.close();
    newForcesFileCsv.clear();
 
}//GenerateForcesHeader()
 
 
//Генерация заголовка файла положения профиля
void Mechanics::GeneratePositionHeader()
{
    if (isMoves)
    {
        std::stringstream positionFileName, positionFileNameCsv;
        positionFileName << W.getPassport().dir << "position-airfoil-" << numberInPassport;
        positionFileNameCsv << W.getPassport().dir << "position-airfoil-" << numberInPassport << ".csv";
 
        std::ofstream newPositionFile(positionFileName.str());
        std::ofstream newPositionFileCsv(positionFileNameCsv.str());
 
        VMlib::PrintLogoToTextFile(newPositionFile, positionFileName.str(), "Position of the airfoil " + W.getPassport().airfoilParams[numberInPassport].fileAirfoil);
 
        VMlib::PrintHeaderToTextFile(newPositionFile, "currentStep     currentTime     x     y     phi     Vx     Vy     w");
 
        newPositionFileCsv << "step,time,x,y,phi,Vx,Vy,w";
 
        newPositionFile.close();
        newPositionFile.clear();
 
        newPositionFileCsv.close();
        newPositionFileCsv.clear();
    }
}//GeneratePositionHeader()
 
 
//Сохранение строки со статистикой в файл нагрузок
void Mechanics::GenerateForcesString()
{
    std::stringstream forceFileName, forceFileNameCsv;
    forceFileName << W.getPassport().dir << "forces-airfoil-" << numberInPassport;
    forceFileNameCsv << W.getPassport().dir << "forces-airfoil-" << numberInPassport << ".csv";
 
    //double cShock = (W.getPassport().physicalProperties.getCurrTime() > W.getPassport().physicalProperties.timeAccel + 2.0 * W.getPassport().timeDiscretizationProperties.dt) ? 1.0 : 0.0;
    double cShock = 1.0;
 
    Point2D cartesianHydroForce = cShock * hydroDynamForce;
    Point2D cartesianViscoForce = cShock * viscousForce;
 
    double cartesianHydroMoment = cShock * hydroDynamMoment;
    double cartesianViscoMoment = cShock * viscousMoment;
 
    double rotationAngle = W.getPassport().airfoilParams[numberInPassport].angle;
    
    //Для обдува ветром, когда углы считаются по компасу
    //if (W.getPassport().geographicalAngles)
    //{
    //  cartesianHydroForce = cartesianHydroForce.rotated(-0.5 * PI - W.getPassport().airfoilParams[numberInPassport].angle);
    //  cartesianViscoForce = cartesianViscoForce.rotated(-0.5 * PI - W.getPassport().airfoilParams[numberInPassport].angle);
    //  //rotationAngle += 0.5 * PI;
    //}
 
    //if (W.getPassport().rotateForces)
    //{
    //  cartesianHydroForce = cartesianHydroForce.rotated(rotationAngle);
    //  cartesianViscoForce = cartesianViscoForce.rotated(rotationAngle);
    //}
 
    double flowPress = 0.5 * W.getPassport().physicalProperties.rho * sqr(W.getPassport().physicalProperties.vRef);
    if (W.getPassport().calcCoefficients)
    {
        const double& chord = W.getPassport().airfoilParams[numberInPassport].chord;
        cartesianHydroForce /= (flowPress * chord);
        cartesianViscoForce /= (flowPress * chord);
 
        cartesianHydroMoment /= (flowPress * sqr(chord));
        cartesianViscoMoment /= (flowPress * sqr(chord));
    }
 
 
    std::ofstream forcesFile(forceFileName.str(), std::ios::app);
    forcesFile << std::endl << W.getCurrentStep() << "  " << W.getCurrentTime() << "    " << cartesianHydroForce[0] << "    " << cartesianHydroForce[1] << "    " << cartesianHydroMoment << "  " << cartesianViscoForce[0] << "    " << cartesianViscoForce[1] << "    " << cartesianViscoMoment;
    forcesFile.close();
 
    std::ofstream forcesFileCsv(forceFileNameCsv.str(), std::ios::app);
    forcesFileCsv << std::endl << W.getCurrentStep() << "," << W.getCurrentTime() << "," << cartesianHydroForce[0] << "," << cartesianHydroForce[1] << "," << cartesianHydroMoment << "," << cartesianViscoForce[0] << "," << cartesianViscoForce[1] << "," << cartesianViscoMoment;
    forcesFileCsv.close();
 
}//GenerateForcesString()
 
 
//Сохранение строки со статистикой в файл положения
void Mechanics::GeneratePositionString()
{
    if (isMoves)
    {
        std::stringstream positionFileName, positionFileNameCsv;
        positionFileName << W.getPassport().dir << "position-airfoil-" << numberInPassport;
        positionFileNameCsv << W.getPassport().dir << "position-airfoil-" << numberInPassport << ".csv";
 
        std::ofstream positionFile(positionFileName.str(), std::ios::app);
        positionFile << std::endl << W.getCurrentStep() << "    " << W.getCurrentTime() << "    " << afl.rcm[0] << "    " << afl.rcm[1] << "    " << Phi << "   " << Vcm[0] << "    " << Vcm[1] << "    " << Wcm;
        positionFile.close();
 
        std::ofstream positionFileCsv(positionFileNameCsv.str(), std::ios::app);
        positionFileCsv << std::endl << W.getCurrentStep() << "," << W.getCurrentTime() << "," << afl.rcm[0] << "," << afl.rcm[1] << "," << Phi << "," << Vcm[0] << "," << Vcm[1] << "," << Wcm;
        positionFileCsv.close();
    }
}//GeneratePositionString()