Numerical Modeling of Surface-Piercing Flexible Hydrofoils in Waves

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
M. Wheeler, K. Matveev
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引用次数: 0

Abstract

Hydrofoils made of metal alloys were broadly used on high-speed boats in the past. Nowadays, much lighter hydrofoils made of composite materials are finding increasingly more applications on sailing yachts and powerboats. However, these hydrofoils are usually rather flexible, and their design requires computationally demanding analysis, involving hydroelastic calculations. In this study, exploratory high-fidelity simulations have been carried out for surface-piercing hydrofoils in unsteady conditions with help of a computational fluid dynamics solver for fluid flow coupled with a finite element solver for the foil structure. To model unsteady foil deformations, the morphing mesh approach was utilized, and the volume-of-fluid method was applied for multiphase flow simulations. The computational setup, as well as verification and validation study, is described in this paper. Three hydrofoils of different stiffness, including a perfectly rigid foil, were simulated in both calm water conditions and regular head waves. Representative examples of foil deflections and wave patterns, as well as time-dependent structural and hydrodynamic characteristics, are presented. Hydrofoils are efficient lift-generating devices intended for application in water flows. Hydrofoils have streamlined shapes, and when operating at small incidence angles, they can produce high lift forces at relatively low drag, when moving in a certain speed range. Due to this ability, hydrofoils and their derivatives are commonly used as control and propulsive devices, e.g., as rudders, fins, and propeller sections. In the second half of the last century, hydrofoils found broad applications on fast boats, such as passenger ferries and military ships (McLeavy 1976; Matveev & Duncan 2005). These craft were able to achieve high speeds at lift–drag ratios (LDR) around 12–15, significantly higher than LDR of other hulls, such as planing boats. However, due to rather limited favorable operational conditions with regard to speed and payload, popularity of hydrofoils somewhat receded. One of drawbacks was that hydrofoils were usually made of metal alloys, thus being relatively heavy and difficult to service.
波浪中穿面柔性水翼的数值模拟
由金属合金制成的水翼片在过去被广泛用于高速船上。如今,由复合材料制成的更轻的水翼在帆船和动力艇上的应用越来越多。然而,这些水翼通常相当灵活,其设计需要计算量高的分析,包括水弹性计算。在这项研究中,借助于流体流动的计算流体动力学求解器和箔片结构的有限元求解器,对非定常条件下的表面穿透水翼进行了探索性的高保真度模拟。为了模拟非定常箔片变形,采用变形网格法,并将流体体积法应用于多相流模拟。本文介绍了计算装置以及验证和验证研究。三个不同刚度的水翼,包括一个完全刚性的箔片,在平静的水条件和规则的头波下进行了模拟。介绍了箔片偏转和波浪模式的代表性例子,以及与时间相关的结构和流体动力学特性。水翼是用于水流的高效升力产生装置。水翼具有流线型形状,当在小入射角下工作时,当在一定的速度范围内移动时,它们可以在相对较低的阻力下产生高升力。由于这种能力,水翼及其衍生物通常用作控制和推进装置,例如舵、鳍和螺旋桨部分。在上世纪下半叶,水翼船在快速船只上得到了广泛的应用,如客运渡轮和军用船只(McLeavy 1976;Matveev和Duncan,2005年)。这些船能够在12-15左右的升阻比(LDR)下实现高速,显著高于其他船体(如滑行艇)的LDR。然而,由于在速度和有效载荷方面有利的操作条件相当有限,水翼艇的受欢迎程度有所下降。其中一个缺点是水翼通常由金属合金制成,因此相对较重,难以维修。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Ship Research
Journal of Ship Research 工程技术-工程:海洋
CiteScore
2.80
自引率
0.00%
发文量
12
审稿时长
6 months
期刊介绍: Original and Timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economic, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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