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Two-Dimensional Unsteady Planing Elastic Plate Michael Makasyeyev Institute of Hydromechanics of NAS of Ukraine, Kyiv 1

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Outline 2 1. Introduction 1.1. Motivations 2. Hydrodynamic problem 3. Elasticity problem 4. Solution method 5. Numerical results 6. Conclusion Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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3 1. Introduction 1.1. Motivations A planing surface is being experienced high forces from the water and it might result in the deformations. As consequences, hydrodynamic characteristics might change and even cause the damage of the hull. At the unsteady motion, for example, on the wave surface, the forces can increase manifold and can have dynamical character. It increases the chance of negative effects. The laws of change of pressure distribution, trim angle, wetted length and draft at the planing of elasticity deformable has not been studied. I am interested in useing approaches and methods of wing theory, in particular the method of singular integral equations. Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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4 2. Hydrodynamic problem,,,, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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5 2. Hydrodynamic problem, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK (2.1), (2.2), (2.3) (2.4) Boundary conditions (2.5) (2.6) Initial conditions or

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6 3. Elasticity problem, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK Boundary conditions Initial conditions (3.1).(3.2).(3.3) (3.4),(3.5) pinning fixed ends free ends or combinations…

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7 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK General idea Classical boundary problem 4.2. Fourier transform and fundamental solution 4.3. Solutions for generalized functions 4.4. Inverse Fourier transform and obtainment of integral equations 4.5. Formation of general simultaneous integral equations system 4.6. Numerical solution of integral equations system by the method of discrete vortexes. Solution of the nonlinear wetted length problem 4.1. Generalized functions problem

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8 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.1. Generalized functions problem

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9 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.1. Generalized functions problem In hydrodynamic problem: In elasticity problem:

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10 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.2. Fourier transform and fundamental solution

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11 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.2. Fourier transform and fundamental solution In hydrodynamic problem: I n elasticity problem:

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12 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.3. Solutions for generalized functions

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13 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.3. Solutions for generalized functions In hydrodynamic problem: I n elasticity problem:

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14 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.4. Inverse Fourier transform and obtainment of integral equations

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15 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.4. Inverse Fourier transform and obtainment of integral equations In hydrodynamic problem: I n elasticity problem:

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16 Steady motion Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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17 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.5. Formation of general simultaneous integral equations system

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18 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.5. Formation of general simultaneous integral equations system Compound integral equation of hydrodynamics and elasticity: Dynamics equations:

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19 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.5. Formation of general simultaneous integral equations system Compound integral equation of hydrodynamics and elasticity: Dynamics equations: Unknown functions:

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20 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.6. Numerical solution of integral equations system by the method of discrete vortexes. Solution of the nonlinear problem of wetted length Compound integral equation of hydrodynamics and elasticity: Dynamics equations: Unknown functions:

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21 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.6. Numerical solution of integral equations system by method of discrete vortexes. Solution of nonlinear problem of wetted length

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22 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.6. Numerical solution of integral equations system by method of discrete vortexes (MDV). Solution of nonlinear problem of wetted length MDV or other

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23 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.6. Numerical solution of integral equations system by method of discrete vortexes (MDV). Solution of nonlinear problem of wetted length MDV or other

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24 4. Solution method, Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK 4.6. Numerical solution of integral equations system by the method of discrete vortexes (MDV). Solution of the nonlinear problem of wetted length MDV or other (least-squares method+ nondifferential minimization)

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25 6. Conclusions,,,,, The unsteady 2D-theory of hydroelasticity planing plate is created. Basically it is the 2D-linearized theory of unsteady motion of small displacement body with elastic bottom on the free surface. At the V 0 =0 we have the theory of floating body. The cases of steady motion and harmonic motion have been obtained at the time t trending to infinity. Difficulties: 1) The obtaining of inverse generalized Fourier transformation for some functions. 2) Some problems in numerical procedures of wetted length definition as time-depended function. Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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Thank you for your attention 26 Mathematical challenges and modeling of hydroelasticity. Jun 21–24, Edinburgh, UK

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