Mechanics2DRigidRotatePart.cpp

Go to the documentation of this file.

/*--------------------------------*- 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: Mechanics2DRigidRotatePart.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.                                         |
|                                                                             |
| 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 "Mechanics2DRigidRotatePart.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;
 
 
MechanicsRigidRotatePart::MechanicsRigidRotatePart(const World2D& W_, size_t numberInPassport_)
    : Mechanics(W_, numberInPassport_, true, false)
    //w0(0.0), 
    //phi0(W_.getAirfoil(numberInPassport_).phiAfl)
{
    Vcm0 = { 0.0, 0.0 };
    Rcm0 = { W_.getAirfoil(numberInPassport_).rcm[0], W_.getAirfoil(numberInPassport_).rcm[1] };
    Vcm = Vcm0;
    Rcm = Rcm0;
    VcmOld = Vcm0;
    RcmOld = Rcm;
        
    MechanicsRigidRotatePart::ReadSpecificParametersFromDictionary();
    Initialize({ 0.0, 0.0 }, W_.getAirfoil(numberInPassport_).rcm, 0.0, W_.getAirfoil(numberInPassport_).phiAfl);
};
 
//Вычисление гидродинамической силы, действующей на профиль
void MechanicsRigidRotatePart::GetHydroDynamForce()
{
    W.getTimers().start("Force");
 
    const double& dt = W.getPassport().timeDiscretizationProperties.dt;
 
    hydroDynamForce = { 0.0, 0.0 };
    hydroDynamMoment = 0.0;
 
    viscousForce = { 0.0, 0.0 };
    viscousMoment = 0.0;
 
    Point2D hDFGam = { 0.0, 0.0 };      //гидродинамические силы, обусловленные присоед.завихренностью
    Point2D hDFdelta = { 0.0, 0.0 };    //гидродинамические силы, обусловленные приростом завихренности
    Point2D hDFQ = { 0.0, 0.0 };        //гидродинамические силы, обусловленные присоед.источниками
 
    double hDMGam = 0.0;                //гидродинамический момент, обусловленный присоед.завихренностью
    double hDMdelta = 0.0;              //гидродинамический момент, обусловленный приростом завихренности
    double hDMQ = 0.0;                  //гидродинамический момент, обусловленный присоед.источниками
 
 
    
 
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
    {
        Point2D rK = 0.5 * (afl.getR(i + 1) + afl.getR(i)) - afl.rcm;   
 
        Point2D velK = { -Wcm * rK[1], Wcm * rK[0] };
 
        double gAtt = Wcm * (rK ^ afl.tau[i]);
        double gAttOld = WcmOld * (rK ^ afl.tau[i]);
        double deltaGAtt = gAtt - gAttOld;
 
        double qAtt = Wcm * (rK ^ afl.nrm[i]);
 
        double deltaK = boundary.sheets.freeVortexSheet(i, 0) * afl.len[i] - afl.gammaThrough[i] + deltaGAtt * afl.len[i];
        
        /*1*/
        hDFdelta += deltaK * Point2D({ -rK[1], rK[0] });
        hDMdelta += 0.5 * deltaK * rK.length2();
 
        /*2*/
        hDFGam += 0.25 * (afl.getV(i) + afl.getV(i + 1)).kcross() * gAtt * afl.len[i];
        hDMGam += 0.25 * rK ^ (afl.getV(i) + afl.getV(i + 1)).kcross() * gAtt * afl.len[i];
 
        /*3*/
        hDFQ -= 0.25 * (afl.getV(i) + afl.getV(i + 1)) * qAtt * afl.len[i];
        hDMQ -= 0.25 * rK ^ (afl.getV(i) + afl.getV(i + 1)) * qAtt * afl.len[i];
    }
 
    const double rho = W.getPassport().physicalProperties.rho;
 
    hydroDynamForce = rho * (hDFGam + hDFdelta * (1.0 / dt) + hDFQ);
    hydroDynamMoment = rho * (hDMGam + hDMdelta / dt + hDMQ);
 
    if ((W.getPassport().physicalProperties.nu > 0.0)/* && (W.currentStep > 0)*/)
        for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
        {
            Point2D rK = 0.5 * (afl.getR(i + 1) + afl.getR(i)) - afl.rcm;
            viscousForce += rho * afl.viscousStress[i] * afl.tau[i];
            viscousMoment += rho * (afl.viscousStress[i] * afl.tau[i]) & rK;
        }
 
    W.getTimers().stop("Force");
}// GetHydroDynamForce()
 
// Вычисление скорости центра масс
Point2D MechanicsRigidRotatePart::VeloOfAirfoilRcm(double currTime)
{
    return Point2D{0.0, 0.0};
}//VeloOfAirfoilRcm(...)
 
// Вычисление положения центра масс
Point2D MechanicsRigidRotatePart::PositionOfAirfoilRcm(double currTime)
{
    return Rcm;
}//PositionOfAirfoilRcm(...)
 
double MechanicsRigidRotatePart::AngularVelocityOfAirfoil(double currTime)
{
    return Wcm;
}//AngularVelocityOfAirfoil(...)
 
double MechanicsRigidRotatePart::AngleOfAirfoil(double currTime)
{
    return afl.phiAfl;
}//AngleOfAirfoil(...)
 
// Вычисление скоростей начал панелей
void MechanicsRigidRotatePart::VeloOfAirfoilPanels(double currTime)
{
    Point2D veloRcm = VeloOfAirfoilRcm(currTime);
 
    std::vector<Point2D> veloW(afl.getNumberOfPanels());
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
        veloW[i] = veloRcm + Wcm * (afl.getR(i) - Rcm).kcross();
 
    afl.setV(veloW);
 
    circulationOld = circulation;
    circulation = 2.0 * afl.area * Wcm;
}//VeloOfAirfoilPanels(...)
 
 
void MechanicsRigidRotatePart::Move()
{
    double Jeff = J;
 
    PhiOld = Phi;
    WcmOld = Wcm;
    
 
    Point2D dr, dV;
    double dphi, dw;
 
    //W.getInfo('t') << "k = " << k << std::endl;
 
 
    dr[1] = 0.0;
    dV[1] = 0.0;
 
    dr[0] = 0.0;
    dV[0] = 0.0;
    
    double bw = 0.0;
    double kw = 0.0;
        
 
    double dt = W.getPassport().timeDiscretizationProperties.dt;
    double t = W.getCurrentTime();
    
    
    double addMom = (t > 3.0 * tAccel) ? externalTorque : 0.0;
 
    if (t > 1.0 * tAccel)
    {
        Point2D kk[4];
        kk[0] = { Wcm, (hydroDynamMoment - 2.0 * bw * Wcm - kw * Phi - addMom) / Jeff };
        kk[1] = { Wcm + 0.5 * dt * kk[0][1], (hydroDynamMoment - 2.0 * bw * (Wcm + 0.5 * dt * kk[0][1]) - kw * (Phi + 0.5 * dt * kk[0][0]) - addMom) / Jeff };
        kk[2] = { Wcm + 0.5 * dt * kk[1][1], (hydroDynamMoment - 2.0 * bw * (Wcm + 0.5 * dt * kk[1][1]) - kw * (Phi + 0.5 * dt * kk[1][0]) - addMom) / Jeff };
        kk[3] = { Wcm + dt * kk[2][1], (hydroDynamMoment - 2.0 * bw * (Wcm + dt * kk[2][1]) - kw * (Phi + dt * kk[2][0]) - addMom) / Jeff };
 
        dphi = dt * (kk[0][0] + 2. * kk[1][0] + 2. * kk[2][0] + kk[3][0]) / 6.0;
        dw = dt * (kk[0][1] + 2. * kk[1][1] + 2. * kk[2][1] + kk[3][1]) / 6.0;
    }
    else 
    {
        double a = wAccel / tAccel;
        dw = dt * a;
        dphi = 0.5 * a * sqr(t) - 0.5 * a * sqr(t - dt);
    }
 
    
    afl.Move(dr);
    afl.Rotate(dphi);
 
    Rcm += dr;
    Vcm += dV;
 
    Phi += dphi;
 
    //std::cout << "Phi = " << Phi << ", afl.Phi = " << afl.phiAfl << std::endl;
 
    Wcm += dw;
 
}//Move()
 
 
 
void MechanicsRigidRotatePart::ReadSpecificParametersFromDictionary()
{
    mechParamsParser->get("J", J);
 
    W.getInfo('i') << "moment of inertia " << "J = " << J << std::endl;
 
    mechParamsParser->get("wAccel", wAccel);
 
    W.getInfo('i') << "wAccel = " << wAccel << std::endl;
 
    mechParamsParser->get("tAccel", tAccel);
 
    W.getInfo('i') << "tAccel = " << tAccel << std::endl;
 
    mechParamsParser->get("externalTorque", externalTorque);
 
    W.getInfo('i') << "externalTorque = " << externalTorque << std::endl;
 
}//ReadSpecificParametersFromDictionary()