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Unsteady Hydrodynamic Simulation of Flexible Bodies using Boundary Element Method

Najafi, Saeed | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50201 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani, Majid
  7. Abstract:
  8. For more than a million years, aquatic animals and specially fishes make undulatory motions in their flexible body to propel themselves. In the recent decays, scientists prove that these mechanisms are more efficient than man-made propulsion systems. A wide variety of artificial vehicles including robotfishes, ROV and etc has been manufactured with inspiring by natural creatures. The Biomimetic science which deals with the study of mechanics and hydrodynamics of living creatures is very important in developing these vehicles. In the present study, numerical software (PANEL3D®), bases on boundary integral equations of potential flow have been developed to simulate hydrodynamic performance of arbitrary rigid/flexible geometries in three dimensional spaces. The classical formulation of BEM coupling with unsteady wake alignment algorithm has been exploiting to simulate propulsion mechanism of bodies. Also to control the instability of hyper singular integrals of BEM, an adaptive exponential mollifying function designed. To verify the solver, some test cases such as marine propeller, oscillating foil, swimming of carangiform and anguilliform fishes and a flexible oscilating duct which inspires the jelly fish swimming have been examined. Also a parametric study on the effect of phase angle of caudal fin on propulsion efficiency of tunafish has been studied. Results show that near 60ᵒ phase angle, maximum thrust and efficiency could be gained which correspond to the experimental observations
  9. Keywords:
  10. Boundary Element Method ; Flexible Body ; Fish Locomotion ; Wake Sheet Alignment

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