Hydrodynamic loads on a group of six structures of different cross-sections in uniform and sheared flow.

Annapeh, Henry Francis; Kurushina, Victoria

Abstract

The estimates of hydrodynamic forces for a group of structures represent a challenge for the design of offshore systems, as they are subject to changes with a variation in flow profiles. The fluctuating effects may be more pronounced or, on the contrary, suppressed if the cross-sectional shape of structures in an array is altered. The present work performs a series of 2D numerical simulations for the flow past six identical stationary cylinders of three distinct geometrical shapes arranged in a 2 × 3 matrix configuration. The flow profiles considered have an averaged velocity corresponding to the critical flow regime of a Reynolds number of 2.5 × 105. The detached eddy simulation k–ω SST turbulence model is employed to perform a comprehensive investigation of the fluid force coefficients, their frequencies and vortex formation patterns. The effect of the spacing ratio varied simultaneously among the structures from 2 to 7 is considered in conjunction with the change in the flow profile and the cylinders’ cross-section. The results of simulations show a higher mean drag on the upstream cylinders, reduced mean drag on the mid- and downstream cylinders with the second cross-sectional shape, and a higher mean drag on the cylinders with the third cross-sectional shape, compared to the original circular cylinders.

Citation

ANNAPEH, H.F. and KURUSHINA, V. 2023. Hydrodynamic loads on a group of six structures of different cross-sections in uniform and sheared flow. Journal of marine science and engineering [online], 11(2), article number 383. Available from: https://doi.org/10.3390/jmse11020383

• Journal Article Type: Article
• Acceptance Date: Feb 3, 2023
• Online Publication Date: Feb 9, 2023
• Publication Date: Feb 28, 2023
• Deposit Date: Feb 13, 2024
• Publicly Available Date: Feb 19, 2024
• Journal: Journal of Marine Science and Engineering
• Electronic ISSN: 2077-1312
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Issue: 2
• Article Number: 383
• DOI: https://doi.org/10.3390/jmse11020383
• Keywords: Hydrodynamic forces; Vortex-induced loads; Uniform flow; Planar sheared flow; Drag coefficient; Lift coefficient
• Public URL: https://rgu-repository.worktribe.com/output/2166737