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Applying Zoning Method for Solving 3D Fluid Flow Problems with Free Surface and Common Boundary Between Two Fluids by Using BEM (Case Studies: OWC Power Plant and Open Ended Storage Tank)

Ghodsi Hassanabad, Majid | 2010

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 40536 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour, Majid
  7. Abstract:
  8. Analysis of hydrodynamic model of sea wave problems has very good conformity with boundary element method (BEM). Because, the governing equation of many sea wave problems is potential equation which is the base of BEM. In this research, after some explanation about BEM and its application in fluid mechanics, a new composition of elements on the discretized boundary is introduced in favor of increasing the precision. In this method, the constant elements are used in corner elements and the linear elements are used in other elements. This issue is validated by comparing with analytical solution. In addition, free surface flow with porous medium in the fluid is investigated in sloshing 2D phenomena. This study has been resulted a new formulation for dynamic free surface boundary condition. This formulation has been validated by comparing numerical solution results with experimental results. BEM modeling of the new formulation is concluded the rapid damping of wall forces and free surface motion in porous medium which is confirmed by experiment. Then, The Oscillating water column (OWC) is analyzed in 2D and 3D coordinates with waves conditions in Iranian shorelines. In this phase of the study, the composed elements have been used (elements which have been introduced in the first section). Before analyzing the main problem, the BEM code has been verified by a solved OWC problem in previous works. Then, an innovative method is introduced in which the parabolic walls are used for concentration of waves on the OWC chamber position. In the following, free surface flow problem is solved for flat and parabolic side walls with BEM and zoning method. As a final result, the optimum powers gathering by OWC power plant in the best point of coasts of our country (near the Chabahar harbor) are 9.5 and 53 KW for flat side walls and parabolic side walls, respectively. Also, solution domain is divided to two parts in open ended storage tank problem by using zoning method and common surface between water and oil is analyzed by BEM. Wave specifications around Abouzar oil field (situated in 75th kilometers at west of Khark island) are used for this analysis. As a result, the tank should not fill more than 50 to 80 centimeters remained to tank end for preventing oil pollution.

  9. Keywords:
  10. Porous Media ; Boundary Element Method ; Oscillating Water Column System ; Composed Element ; Open End Stroge Tank

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