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Fluid Sloshing in Tanks with Perforated Baffles

Zojaji, Mohammad Masoud | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53344 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Dehghani Firouzabadi, Rouhollah
  7. Abstract:
  8. The issue of fluid sloshing in vessels is of paramount importance in aerospace engineering. To suppress sloshing Baffles are used and one kind of baffles is “Perforated Baffle” that is good in weight efficiency. When fluid passes through Perforated Baffle, the energy dissipates and sloshing induces. The purpose of this study is to develop a model for linear sloshing in presence of a Perforated Baffle in the vessel. In this project, the flow is modeled by potential function. The Flow may be rotational in the nearby of baffle due to viscosity when it passes through-out perforations, so Laplace's equation for the velocity potential is useless in this region. To simulate the flow in such zones, a transfer function will be used to converse the difference of pressure at opposite sides of a baffle. To make this transfer function, a single hole will be modeled in Computational Fluid Dynamics software (CFD) under harmonic conditions with different frequencies. Finally, Laplace's equation and the transfer function will be combined and solved using the Boundary Element Method (BEM) to obtain natural frequencies and mode shapes of the system. BEM is not only an absolutely fast solution in comparison with other means of solution like modeling a complete vessel in CFD software; but also helps us find frequencies and mode shapes for different transfer functions quickly which is useful in shortening the baffle design process
  9. Keywords:
  10. Baffle ; Boundary Element Method ; Perforated Baffle ; Sloshing ; Perforated Screen ; Porous Baffle

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