The hydrodynamic analyses of a multi-cylinder structure in waves based on AQWA

ZHAO Zhilei, ZHOU Zihao

doi:10.16411/j.cnki.issn1006-7736.2025.02.004

Journal of Dalian Maritime University >

2025 , Vol. 51 >Issue 2: 32 - 38

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2025.02.004

The hydrodynamic analyses of a multi-cylinder structure in waves based on AQWA

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(1. Navigation College, Dalian Maritime University, Dalian 116026, China; 2. World Maritime University, Malmö, Sweden 20124)

Received date: 2024-02-03

Revised date: 2024-02-03

Accepted date: 2024-02-03

Online published: 2024-02-03

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Abstract

The hydrodynamics of four-column structures in waves is studied by using AQWA software. The relationships of the first order wave force and the second order wave force with wave frequency are analyzed, and the wave elevations at the characteristic points around the cylinder and the wave surface distribution around the cylinder at different frequencies are given. The results of research shows the following conclusions: When kr < 0.5 in relatively low frequency region, the peak values of the first order surge force of each cylinder do not show much differences; however, the first-order longitudinal wave forces of the cylinder show obvious oscillating characteristics in relatively middle and high frequency region when kr ＞ 0.5, the maximum peak value is reached near kr = 1.68, but the difference of the first order heave wave force on each column is not obvious. The second order wave force of the four-column structure is directed from inside of the structure to the outside of the structure. With the increase of wavelength, the transmitted ability of the wave passing through the four-column body becomes stronger. However, when kr is around 1.68, the wave interference resonance occurs in the internal space of the four-column body, resulting in a significant rise of the wave around the column. This study reveals the law of hydrodynamic interference and resonance phenomenon between multiple cylinders in waves, which can provide theoretical reference for the subsequent design of pile foundation of offshore wind turbine platform.

Key words： multi-column structure; potential flow method; wave force; wave elevation; AQWA

Cite this article

ZHAO Zhilei, ZHOU Zihao . The hydrodynamic analyses of a multi-cylinder structure in waves based on AQWA[J]. Journal of Dalian Maritime University, 2025 , 51(2) : 32 -38 . DOI: 10.16411/j.cnki.issn1006-7736.2025.02.004

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