AIP Advances, Journal Year: 2024, Volume and Issue: 14(12)

Published: Dec. 1, 2024

This study examines the variations in wake structures and fluid forces around a cluster of five square cylinders. The cylinders are arranged such that larger cylinder (the main cylinder) is surrounded by four similar but small-sized cylinders, which very common marine risers axial pipe shrouds. analysis uses an in-house developed code based on lattice Boltzmann method. gap spacing (g*) between surrounding varies from 0 to 10 while maintaining fixed Reynolds number (Re) 200. accuracy consistency first tested through simulations examine flow behind single cylinder, revealing strong concurrence with existing data. In next step, characteristics pentad arrangement analyzed. Five diverse modes, including extended bluff body flow, stable symmetric chaotic irregular shedding, antiphase modulated periodic observed depending distances. It found small downstream position primary experience negative mean drag at narrow gaps. contrast, those upstream subjected positive force regardless spacing. has higher coefficient compared other for all cases. shedding frequencies appear smaller-size values, significantly deviate

Language: Английский