Numerical study of shallow-draft air-cavity hull with two-step bottom in deep and shallow water

船体 阻力 波浪和浅水 海洋工程 机械 流离失所(心理学) 修剪 工程类 计算流体力学 地质学 环境科学 结构工程 物理 心理学 海洋学 心理治疗师
作者
Konstantin I. Matveev
出处
期刊:Ocean Engineering [Elsevier]
卷期号:246: 110621-110621 被引量:2
标识
DOI:10.1016/j.oceaneng.2022.110621
摘要

Air-cavity boats utilize air injection to the bottom hull surface to reduce water drag. While being attractive due to potentially large energy savings, this technology has not yet found broad applications due to challenges in confidently predicting air-cavity flows and a lack of standard development practices for air-cavity vessels. In this work, computational fluid dynamics modeling is undertaken to demonstrate the air-cavity system implementation on a simple shallow-draft hull. After conducting verification and validation study with data available for a displacement barge-type air-cavity boat, its hull is numerically modified with intention to operate at higher speeds up to the planing regime. The modifications include replacement of a sloping beach in the bottom recess with additional step and reduction of skeg volume. Computational simulations are carried out for the modified hull at several speeds and center of gravity positions. Numerically obtained resistance, trim, heave, and air-cavity shapes are reported and discussed. A favorable loading condition is identified. In addition, simulations were conducted for shallow-water scenarios. In steady-state regimes, significant performance degradation is found near the critical speed, while performance gains are demonstrated in the supercritical regime. In one case of extremely shallow water, the hull exhibited vertical-plane instability resulting in cyclic motions.
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