Wind and Structures

Techno-Press (테크노프레스)
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3D Numerical investigation of a rounded corner square cylinder for supercritical flows

  • Vishwanath, Nivedan (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus) ;
  • Saravanakumar, Aditya K. (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus) ;
  • Dwivedi, Kush (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus) ;
  • Murthy, Kalluri R.C. (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus) ;
  • Gurugubelli, Pardha S. (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus) ;
  • Rajasekharan, Sabareesh G. (Department of Mechanical Engineering, BITS Pilani Hyderabad Campus)
  • Received : 2022.01.29
  • Accepted : 2022.06.28
  • Published : 2022.07.25
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Abstract

Tall buildings are often subjected to steady and unsteady forces due to external wind flows. Measurement and mitigation of these forces becomes critical to structural design in engineering applications. Over the last few decades, many approaches such as modification of the external geometry of structures have been investigated to mitigate wind-induced load. One such proven geometric modification involved the rounding of sharp corners. In this work, we systematically analyze the impact of rounded corner radii on the reducing the flow-induced loading on a square cylinder. We perform 3-Dimensional (3D) simulations for high Reynolds number flows (Re=1 × 105) which are more likely to be encountered in practical applications. An Improved Delayed Detached Eddy Simulation (IDDES) method capable of capturing flow accurately at large Reynolds numbers is employed in this study. The IDDES formulation uses a k-ω Shear Stress Transport (SST) model for near-wall modelling that prevents mesh-induced separation of the boundary layer. The effects of these corner modifications are analyzed in terms of the resulting variations in the mean and fluctuating components of the aerodynamic forces compared to a square cylinder with no geometric changes. Plots of the angular distribution of the mean and fluctuating coefficient of pressure along the square cylinder's surface illustrate the effects of corner modifications on the different parts of the cylinder. The windward corner's separation angle was observed to decrease with an increase in radius, resulting in a narrower and longer recirculation region. Furthermore, with an increase in radius, a reduction in the fluctuating lift, mean drag, and fluctuating drag coefficients has been observed.

Keywords

Acknowledgement

The authors sincerely acknowledge the financial support received from LIGO India to carry out the following study.

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