Mechanics2DDeformable.h

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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: Mechanics2DDeformable.h                                          |
| Info: Source code of VM2D                                                   |
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| This file is part of VM2D.                                                  |
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\*---------------------------------------------------------------------------*/
 
 
#ifndef MECHANICS2DDEFORMABLE_H
#define MECHANICS2DDEFORMABLE_H
 
#include "Mechanics2D.h"
 
namespace VM2D
{
 
    class World2D;
 
    class Beam
    {
    public:
        const bool fsi;
        
        const World2D& W;
 
        double x0; //абсцисса начала балки
        double L;  //длина балки
 
        double rho, F, EJ;
 
        int R;
        
        //соб.частоты для единичной консольной балки
        const std::vector<double> unitLambda = { 1.87510407, 4.69409113, 7.854757, 10.99554073, 14.1371683 };
        std::vector<double> qCoeff;
 
        //Интегралы от квадратов собственных форм
        const double intSqUnitShape = 0.25;
 
        //Собств.формы
        double shape(int n, double x) const
        {
            double lam = unitLambda[n] / L;
            double C4 = (sin(unitLambda[n]) - sinh(unitLambda[n])) / (cos(unitLambda[n]) + cosh(unitLambda[n]));
 
            return 0.5 * (-cos(lam * (x - x0)) + cosh(lam * (x - x0)) - C4 * sin(lam * (x - x0)) + C4 * sinh(lam * (x - x0)));
        }
 
        std::vector<double> currentPhi, currentDPhi;
 
        const size_t nLastSteps = 1;
        std::vector<std::vector<double>> presLastSteps;
 
    public:
        Beam(const World2D& W_, bool fsi_, double x0_, double L_, int R_);
        double phi(int n, double t) const;
        void solveDU(int n, double dt);
        void solveDU_RK(int n, double dt);
        double getTotalDisp(double x, double t) const;
        double getGivenLaw(double x, double t, double deformParam) const; //имитатор деформации упругой линии
    };
 
 
    struct ChordPanel //Хорда балки (упругая линия)
    {
        Point2D beg, end;                    //начало и конец
        std::pair<size_t, size_t> infPanels; //индексы панелей на обтекаемой поверхности балки под хордой и над хордой
        double rightSemiWidth;               //полутолщина балки на правом конце
    };
 
 
 
    class MechanicsDeformable :
        public Mechanics
    {
    private:
        double deformParam;
        bool fsi; //false for fish, true for turek
        
 
    public:
        Point2D& getVcm() { return Vcm; };      
 
        Point2D& getRcm() { return Rcm; };
 
        double& getWcm() { return Wcm; };
 
        double& getPhicm() { return Phi; };
 
        //bool getFsi() const { return fsi; }; //false for fish, true for turek
 
        MechanicsDeformable(const World2D& W_, size_t numberInPassport_);
 
        ~MechanicsDeformable() {};
 
        //далее -- реализации виртуальных функций
        virtual void GetHydroDynamForce() override;
        virtual Point2D VeloOfAirfoilRcm(double currTime) override;
        virtual Point2D PositionOfAirfoilRcm(double currTime) override;
        virtual double AngularVelocityOfAirfoil(double currTime) override;
        virtual double AngleOfAirfoil(double currTime) override;
        virtual void VeloOfAirfoilPanels(double currTime) override;
        virtual void ReadSpecificParametersFromDictionary() override;
        virtual void Move() override;
 
        size_t indexOfUpperRightAngle;
        size_t indexOfUpperLeftAngle;
        size_t indexOfLowerRightAngle;
        size_t indexOfLowerLeftAngle;
 
        std::vector<ChordPanel> initialChord;    //геометрия упругой линии в начальном состоянии
        std::vector<ChordPanel> chord;    //геометрия упругой линии
        std::vector<double> upperShifts;  //превышения (по вертикали) точек верхней половины торца балки над хордой
        std::vector<double> lowerShifts;  //превышения (по вертикали) точек нижней половины торца балки над хордой
 
        std::unique_ptr<Beam> beam;       //сама балка
 
        std::vector<std::vector<Point2D>> initialPossibleWays;
 
    };
 
}//namespace VM2D
 
#endif