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Experimental and Numerical Investigation of Eel Hydrodynamics

Babakhani Galangashi, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52470 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani, Majid; Khorasnachi, Mahdi; Shafiei, Mohammad Behshad
  7. Abstract:
  8. In the present study, the objective was to obtain the forward and backward swimming equation for the fiery eel and the European Eel in the experimental section. Then, by processing the videos, swimming equations were extracted. The obtained equations were used to move the 3D eel geometry of the STAR-CCM + software. The purpose of numerical modeling is to study the effect of body amplitude and wave frequency on the forces applied on the eel body during swimming. Numerical simulations were performed for the three amplitudes of 0.1, 0.115, and 0.138m and four different frequencies of 1, 1.2, 1.2 Hz, and Reynolds number 3857. The results of numerical work show us that the increase in the wave amplitude increases the amplitude of the drag force applied to the eel body. If the average force is shifted to zero, then the drag coefficient in the 0.138 m case is higher than the 0.1 m of amplitude case.On the other hand, as the Strouhal number increases (increase in wave frequency), the drag force of the eel decreases gradually until it reaches a point where the critical Strouhal number is called zero, resulting in zero drag and thrust force. Then, by increasing the Strouhal number, the thrust force overcomes the drag force, and the resulting force becomes the thrust and gets a positive sign. In the end, the effect of different parts of the eel body on the productive thrust and drag is examined. By examining the forces applied to the eight different parts of the eel body, it was found that the tail parts of the eel would have a more significant impact on trust production
  9. Keywords:
  10. Swimming Hydrodynamics ; Fish Locomotion ; Eel ; Numerical Modeling ; Computational Fluid Dynamics (CFD) ; Forward and Backward Swimming ; Anguification Motion

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