Experimental investigation of flow around a 45 oriented cube for Reynolds numbers between 500 and 50 000

Majid Hassan Khan, P. Sooraj, Atul Sharma, and Amit Agrawal
Phys. Rev. Fluids 6, 074606 – Published 15 July 2021

Abstract

Flow around an oriented cube is experimentally studied using particle image velocimetry measurements. The cube is rigidly suspended and oriented at an angle of 45 with respect to the freestream flow. Instantaneous and mean flow fields in the wake have been examined at 16 different values of Reynolds numbers between 500 and 50000. Vorticity identified using swirling strength shows a chaotic wake at higher Re. A wider wake and a longer wake length are noted as compared to flow around a normal cube. The wake width collapses to nearly the same value for all Re beyond the wake length. Unlike a cube, an oriented cube has a recirculation region with multiple peaks for velocity deficit, which is a signature of many smaller eddies present in the wake. The range of investigated Reynolds numbers shows behavioral changes in the wake, hinting at the possibility of critical Reynolds numbers (or different regimes) based on a maximum velocity deficit, maximum vorticity magnitude, and energy content of the first mode extracted using proper orthogonal decomposition. Proper orthogonal decomposition has been used to understand the contribution of different modes in the formation of coherent structures in the wake. An oriented cube is an extreme case for nonspherical objects and has marked differences from the wake of a cube and other regular-shaped objects. The present work is an attempt to provide an understanding of and improve upon the scarce investigation performed for the wake of an oriented cube.

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  • Received 19 June 2020
  • Accepted 22 June 2021

DOI:https://doi.org/10.1103/PhysRevFluids.6.074606

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Majid Hassan Khan, P. Sooraj, Atul Sharma, and Amit Agrawal*

  • Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra 400076, India

  • *amit.agrawal@iitb.ac.in

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Issue

Vol. 6, Iss. 7 — July 2021

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