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A Reduced Order Hydroelastic Analysis of 3D Hydrofoil Considering Partial Sheet Cavitation Effects

Alavi, Mahdi | 2019

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52156 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan; Dehghani Firouz-abad, Roohallah
  7. Abstract:
  8. In this Thesis hydroelastic analysis of 3D hydrofoil is investigated while partial sheet cavitation effects are considered. To this aim, first steady cavity boundary must be recognized.This region is calculated by means of conventional iterative procedure, stood upon potential flow theorem. In the second step, the reduced order fluid dynamics equations are derived based on potential flow theorem along with finite element method. This procedure is done in a way that real time system of equations are derived and iterative algorithm of conventional methods is omitted. To this aim, it is assumed that amplitude and frequency of the body oscillations are altered so that the cavity length in unsteady flow remains unchanged, so it can be proved that the simulation of the unsteady hydrodynamic flow can be performed by imposing some velocity fluctuations over the rigid cavity boundary. For the third step, structural dynamic equations are obtained based on modal analysis technique along with the finite element method. Finally, governing system of equations are attained by combination of fluid-structural equations. According to this approach, several problem contain 2D and 3D cases, with and without cavity effects are surveyed and some results are verified. Finally, effects of fluid and structural parameters are investigated over the hydroelastic boundaries and several consequences are presented
  9. Keywords:
  10. Hydroelasatic Analysis ; Three Dimentional Hydrofoil ; Sheet Cavitation ; Stability Analysis ; Reduced Order Model

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