STUDY ON DYNAMIC INTERFERENCE OF DOCBLE SEMI-SUBMERGED FLOATING OFFSHORE WIND TURBINES CONSIDERING HYDRODYNAMIC INTERACTION EFFECTS

Wu Bang; Hua Xugang; Wang Wenxi

doi:10.19912/j.0254-0096.tynxb.2025-1011

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (12) : 337-347. DOI: 10.19912/j.0254-0096.tynxb.2025-1011

STUDY ON DYNAMIC INTERFERENCE OF DOCBLE SEMI-SUBMERGED FLOATING OFFSHORE WIND TURBINES CONSIDERING HYDRODYNAMIC INTERACTION EFFECTS

Wu Bang^1,2, Hua Xugang^1,2, Wang Wenxi^1,2

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Abstract

This paper conducts a numerical simulation study on the hydrodynamic interactions problem of double semi-submersible floating bodies under the action of wind and waves. Specifically, two 5 MW semi-submersible wind turbines aligned in tandem in the same wind farm are investigated. The research employs time-domain numerical simulations to assess the influence of turbulent wind and second-order Stokes wave effects on the hydrodynamic interactions and their consequent impact on the structural dynamic response of the downstream turbine. The analysis considers varying wave lengths （L=60-120 m） and center-to-center spacing distances （D=160-300 m）. The findings reveal that, for a fixed center-to-center distance, both the peak and mean heave motions initially increase and subsequently decrease as the wavelength increases, attaining a maximum at approximately 90 m. In contrast, the maximum values and standard deviations of pitch and roll motions exhibit an increasing trend with wavelength, whereas their mean values decline. Regarding hydrodynamic forces, the maximum diffraction and Froude-Krylov （FK） forces both display a non-monotonic behavior, with the diffraction force peaking at a wavelength of 90 m and the FK force reaching its maximum at 80 m. When the wavelength is held constant, increasing the center-to-center distance from 160 m results in maximum differences exceeding 6% in all statistical measures of heave motion, with standard deviation differences surpassing 11%. Conversely, variations in pitch and roll statistics remain within 5%. The diffraction force shows an initial increase followed by minor fluctuations, while the FK force’s maximum value remains essentially constant as spacing increases. These results underscore the necessity of accounting for hydrodynamic interactions among floating structures when analyzing dynamic interference effects in semi-submersible wind turbine arrays. Comparative analysis with a single turbine under identical environmental conditions indicates that hydrodynamic interference effects on the dynamic response of the downstream turbine become negligible when the center-to-center spacing reaches 400 m.

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offshore wind power / semi-submerble foundation / floating wind turbine / hydrodynamic interactions / numerical simulation / dynamic response

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Wu Bang, Hua Xugang, Wang Wenxi. STUDY ON DYNAMIC INTERFERENCE OF DOCBLE SEMI-SUBMERGED FLOATING OFFSHORE WIND TURBINES CONSIDERING HYDRODYNAMIC INTERACTION EFFECTS[J]. Acta Energiae Solaris Sinica. 2026, 47(12): 337-347 https://doi.org/10.19912/j.0254-0096.tynxb.2025-1011

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