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Numerical Computations for Flow Patterns and Force Statistics of Three Rectangular Cylinders

Author

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  • Hamid Rahman
  • Shams-ul-Islam
  • Waqas Sarwar Abbasi
  • Raheela Manzoor
  • Fazle Amin
  • Zeeshan Alam

Abstract

In this work, numerical simulations are performed in order to study the effects of aspect ratio (AR) and Reynolds number (Re) on flow characteristics of three side-by-side rectangular cylinders for fixed spacing ratio ( ), using the lattice Boltzmann method (LBM). The Reynolds number varies within the range 60 ≤ Re ≤ 180, aspect ratio is between 0.25 and 4, and spacing ratio is fixed at  = 1.5. The flow structure mechanism behind the cylinders is analyzed in terms of vorticity contour visualization, time-trace analysis of drag and lift coefficients, power spectrum analysis of lift coefficient and variations of mean drag coefficient, and Strouhal number. For different combinations of AR and Re, the flow is characterized into regular, irregular, and symmetric vortex shedding. In regular and symmetric vortex shedding the drag and lift coefficients vary smoothly while reverse trend occurs in irregular vortex shedding. At small AR, each cylinder experiences higher magnitude drag force as compared to intermediate and large aspect ratios. The vortex shedding frequency was found to be smaller at smaller AR and increased with increment in AR.

Suggested Citation

  • Hamid Rahman & Shams-ul-Islam & Waqas Sarwar Abbasi & Raheela Manzoor & Fazle Amin & Zeeshan Alam, 2021. "Numerical Computations for Flow Patterns and Force Statistics of Three Rectangular Cylinders," Mathematical Problems in Engineering, Hindawi, vol. 2021, pages 1-12, November.
    • Handle: RePEc:hin:jnlmpe:9991132
    DOI: 10.1155/2021/9991132
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    Cited by:

    1. Neelam Tahir & Waqas Sarwar Abbasi & Hamid Rahman & Mubarak Alrashoud & Ahmed Ghoneim & Abdulhameed Alelaiwi, 2023. "Rectangular Cylinder Orientation and Aspect Ratio Impact on the Onset of Vortex Shedding," Mathematics, MDPI, vol. 11(22), pages 1-22, November.

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