FiniteAxisSymmetricWall.h

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#ifndef FINITEAXISSYMETRICWALL_H
#define FINITEAXISSYMETRICWALL_H

#include "FiniteWall.h"

class FiniteAxisSymmetricWall : public FiniteWall
{
    public:
    FiniteAxisSymmetricWall() : FiniteWall()
    {
        CartesianVelocity.set_zero();
        axisOrigin.set_zero();
        axisOrientation.set_zero();     
        #ifdef CONSTUCTOR_OUTPUT
            std::cout<<"FiniteAxisSymmetricWall() finished"<<std::endl;
        #endif
    }
    
    FiniteAxisSymmetricWall (const FiniteAxisSymmetricWall &p) : FiniteWall(p)
    {
        CartesianVelocity=p.CartesianVelocity;
        axisOrigin=p.axisOrigin;
        axisOrientation=p.axisOrientation;
        #ifdef CONSTUCTOR_OUTPUT
            std::cout<<"FiniteAxisSymmetricWall(const FiniteAxisSymmetricWall &p) finished"<<std::endl;
        #endif
    }   

    FiniteAxisSymmetricWall* copy() const
    {
        return new FiniteAxisSymmetricWall(*this);
    } 

    bool get_distance_and_normal(BaseParticle &P, Mdouble &distance, Vec3D &normal_return)
    { 
        //transform to axisymmetric coordinates
        Vec3D PO = P.get_Position() - axisOrigin; //move the coordinate system to the axis origin, so P0=(xhat,yhat,zhat) 
        Vec3D tangential = PO-P.get_Position().Z*axisOrientation; //tangential is the projection into the (xhat,yhat) plane
        P.set_Position(Vec3D(tangential.GetLength(),0.0,Dot(axisOrientation,PO))); //now P=(r,phi,zhat) is cylindrical
        tangential /= P.get_Position().X;
        Vec3D normal_axisymmetric_coordinates;
        //determine wall distance, normal and contact in axissymmetric coordinates
        //and transform from axisymmetric coordinates
        if(!FiniteWall::get_distance_and_normal(P, distance, normal_axisymmetric_coordinates))
        {
            //if not in contact
            P.set_Position(PO + axisOrigin);
            return false;
        } else {
            //if in contact
            normal_return = normal_axisymmetric_coordinates.Z * axisOrientation + tangential*normal_axisymmetric_coordinates.X;     
            if (!velocity.is_zero()) { //assuming most walls have zero velocity, this if statement saves time
                Vec3D angular = Cross(axisOrientation,tangential);
                CartesianVelocity = Vec3D(velocity.Z*axisOrientation + tangential*velocity.X + angular*P.get_Position().X*velocity.Y);
            }
            P.set_Position(PO + axisOrigin);
            //std::cout << P.get_Position() << " v " << get_Velocity() << " cv " << velocity << std::endl;
            return true;
        }
    }

    void setSymmetryAxis(Vec3D new_axisOrigin, Vec3D new_axisOrientation) {
        axisOrigin = new_axisOrigin;
        axisOrientation = new_axisOrientation;
        axisOrientation.normalize();
    }
    
    void read(std::istream& is)
    { 
        std::string dummy;
        is>>axisOrigin>>axisOrientation;
        FiniteWall::read(is);
    }    

    void print(std::ostream& os) const
    {
        os << "FiniteAxisSymmetricWall axisOrigin "<<axisOrigin<<" axisOrientation "<<axisOrientation<<" "; 
        FiniteWall::print(os);
    }
    
    Vec3D get_Velocity() const  {return CartesianVelocity;}

    void moveAxisOrigin(Vec3D velocity_, Mdouble dt) {
        velocity=velocity_;
        axisOrigin+=velocity*dt;
    }

    Vec3D getAxisOrigin() const  {return axisOrigin;}

    private:
    Vec3D axisOrigin;
    Vec3D axisOrientation;
    Vec3D CartesianVelocity;
};

#endif