Added resistance and seakeeping performance of trimarans in oblique waves

Gong, Jiaye; Yan, Shiqiang; Ma, Qingwei; Li, Yunbo

doi:10.1016/j.oceaneng.2020.107721

Cited by 37 publications

(12 citation statements)

References 29 publications

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“…2019; Gong et al. 2020). The structures in these studies are either moored or self-propelled, and their sizes are at least 0.2 times the characteristic wavelength.…”

Section: Modelsmentioning

confidence: 99%

Surface gravity wave-induced drift of floating objects in the diffraction regime

Xiao,

Calvert,

Yan

et al. 2024

J. Fluid Mech.

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Floating objects will drift due to the action of surface gravity waves. This drift will depart from that of a perfect Lagrangian tracer due to both viscous effects (non-potential flow) and wave–body interaction (potential flow). We examine the drift of freely floating objects in regular (non-breaking) deep-water wave fields for object sizes that are large enough to cause significant diffraction. Systematic numerical simulations are performed using a hybrid numerical solver, qaleFOAM, which deals with both viscosity and wave–body interaction. For very small objects, the model predicts a wave-induced drift equal to the Stokes drift. For larger objects, the drift is generally greater and increases with object size (we examine object sizes up to $10\,\%$ of the wavelength). The effects of different shapes, sizes and submergence depths and steepnesses are examined. Furthermore, we derive a ‘diffraction-modified Stokes drift’ akin to Stokes (Trans. Camb. Phil. Soc., vol. 8, 1847, pp. 411–455), but based on the combination of incident, diffracted and radiated wave fields, which are based on potential-flow theory and obtained using the boundary element method. This diffraction-modified Stokes drift explains both qualitatively and quantitatively the increase in drift. Generally, round objects do not diffract the wave field significantly and do not experience a significant drift enhancement as a result. For box-shape objects, drift enhancement is greater for larger objects with greater submergence depths (we report an increase of $92\,\%$ for simulations without viscosity and $113\,\%$ with viscosity for a round-cornered box whose size is $10\,\%$ of the wavelength). We identify the specific standing wave pattern that arises near the object because of diffraction as the main cause of the enhanced drift. Viscosity plays a small positive role in the enhanced drift behaviour of large objects, increasing the drift further by approximately $20\,\%$ .

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“…2019; Gong et al. 2020). The structures in these studies are either moored or self-propelled, and their sizes are at least 0.2 times the characteristic wavelength.…”

Section: Modelsmentioning

confidence: 99%

Surface gravity wave-induced drift of floating objects in the diffraction regime

Xiao,

Calvert,

Yan

et al. 2024

J. Fluid Mech.

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“…Usually, in the region near structure or with potential breaking waves of interest, the NS model is used whilst the FNPT model is employed in the far field if the domain partitioning approach is adopted. They explored different coupling strategies, including the mesh-based (Li et al, 2018;Gong et al, 2020) Below, a summary on the coupling of meshless MLPG_R method with the FNPT model will be given.…”

Section: One-way and Two-way Coupling With Fnptmentioning

confidence: 99%

Review on the local weak form-based meshless method (MLPG): Developments and Applications in Ocean Engineering

Sriram

2021

Applied Ocean Research

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“…To estimate these quantities more accurately, various theoretical calculation schemes have been developed as alternatives to the strip methods [1,2] (e.g., [3][4][5][6]). Recently, with the development of computer technologies, computed results of seakeeping performance have been produced with Computational Fluid Dynamics (CFD) (e.g., [7][8][9][10]). These sophisticated schemes are expected to estimate the local pressure on the ship-hull surface of complex shapes around the bow that cannot be captured with sufficient accuracy by strip methods.…”

Section: Introductionmentioning

confidence: 99%

Temperature interference in improved FBG pressure sensor for towing tank test

et al. 2023

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Because of EEDI regulations for ships and SDGs, it is of vital importance to develop ships with good propulsion performance, not only in still water, but also in waves. To predict the propulsion and seakeeping performance in waves, and in particular ship motions and added resistance, various theoretical calculation methods and CFD codes have been developed. To validate these estimation methods, experimental data on details of the flow induced by the ship disturbance are required. To meet this demand, the authors developed an innovative method for measuring and analyzing the spatial pressure distribution over the ship-hull surface using a large number of Fiber Bragg Grating (FBG) pressure sensors. However, pressure measurements with the conventional FBG pressure sensors are largely influenced by the difference in the temperature between water and air, referred to as the temperature interference. To resolve this issue, the authors developed a new FBG pressure sensor that incorporates three improvements and is significantly less influenced by temperature interference. Its performance was confirmed through comparisons with measured pressures obtained using existing strain-type and conventional FBG pressure sensors. Furthermore, the effects of different materials used for manufacturing ship models on the pressure measurement were investigated experimentally in towing tank tests. Finally, an experimental study was conducted to determine which of the three improvements in the latest FBG pressure sensor is essential for reducing the temperature interference.

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Added resistance and seakeeping performance of trimarans in oblique waves

Cited by 37 publications

References 29 publications

Surface gravity wave-induced drift of floating objects in the diffraction regime

Surface gravity wave-induced drift of floating objects in the diffraction regime

Review on the local weak form-based meshless method (MLPG): Developments and Applications in Ocean Engineering

Temperature interference in improved FBG pressure sensor for towing tank test

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