Mechanics2DRigidImmovable.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: Mechanics2DRigidImmovable.cpp                                    |
| Info: Source code of VM2D                                                   |
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\*---------------------------------------------------------------------------*/
 
 
#include "Mechanics2DRigidImmovable.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;
 
 
MechanicsRigidImmovable::MechanicsRigidImmovable(const World2D & W_, size_t numberInPassport_)
    : Mechanics(W_, numberInPassport_, false, false)
{
    MechanicsRigidImmovable::ReadSpecificParametersFromDictionary();
    Initialize({ 0.0, 0.0 }, W_.getAirfoil(numberInPassport_).rcm, 0.0, W_.getAirfoil(numberInPassport_).phiAfl);
};
 
//Вычисление скорости центра масс профиля
Point2D MechanicsRigidImmovable::VeloOfAirfoilRcm(double currTime)
{
    return{ 0.0, 0.0 };
}//VeloOfAirfoilRcm(...)
 
//Вычисление положения центра масс профиля
Point2D MechanicsRigidImmovable::PositionOfAirfoilRcm(double currTime)
{
    return afl.rcm;
}//PositionOfAirfoilRcm(...)
 
double MechanicsRigidImmovable::AngularVelocityOfAirfoil(double currTime)
{
    return 0.0;
}//AngularVelocityOfAirfoil(...)
 
//Вычисление угла поворота профиля
double MechanicsRigidImmovable::AngleOfAirfoil(double currTime)
{
    return afl.phiAfl;
}//AngleOfAirfoil(...)
 
// Вычисление скоростей начал панелей
void MechanicsRigidImmovable::VeloOfAirfoilPanels(double currTime)
{
    Point2D veloRcm = VeloOfAirfoilRcm(currTime);
    afl.setV(veloRcm);  
}//VeloOfAirfoilPanels(...)
 
//Вычисление гидродинамической силы, действующей на профиль
void MechanicsRigidImmovable::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 Gamma_k
    Point2D hDFdelta = { 0.0, 0.0 };    //гидродинамические силы, обусловленные delta_k
    double hDMdelta = 0.0;
 
    for (size_t i = 0; i < afl.getNumberOfPanels(); ++i)
    {
        double deltaK =  boundary.sheets.freeVortexSheet(i, 0) * afl.len[i] - afl.gammaThrough[i];
        Point2D rK = 0.5 * (afl.getR(i + 1) + afl.getR(i)) - afl.rcm;
 
        hDFdelta += deltaK * Point2D({ -rK[1], rK[0] });
        hDMdelta += 0.5 * deltaK * rK.length2();    
    }
 
    const double rho = W.getPassport().physicalProperties.rho;
 
    hydroDynamForce = (rho / dt) * hDFdelta;
    hydroDynamMoment = (rho / dt) * hDMdelta;
        
    if ((W.getPassport().physicalProperties.nu > 0.0) && (afl.viscousStress.size() > 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()