Simulation research on water-entry impact force of an autonomous underwater helicopter
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ORIGINAL ARTICLE
Simulation research on water‑entry impact force of an autonomous underwater helicopter Chen‑Wei Chen1 · Tongxu Wang1 · Zhuo Feng1 · Yifan Lu1 · Haocai Huang1 · Daxiong Ji1 · Ying Chen1 Received: 3 January 2018 / Accepted: 8 February 2020 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2020
Abstract Autonomous Underwater Helicopter (AUH) is a novel dish-shaped multi-functional submersible vehicle in the autonomous underwater vehicle (AUV) family. Numerical study of launch and recovery system for AUVs from a research vessel is significant in the overall design. Single-arm crane and air-launch way are the important ways of launching AUVs with the high expertise and security. However, AUVs are still easily subject to a huge impact load which can cause the body damage, malfunction of electronic components, and other serious accidents when AUVs are launching into water. In this paper, unsteady, incompressible, two-phase flow with identified boundary conditions was modeled in the computational domain using Volume of Fluid (VOF) technology, and different overset-grid sizes were set and analyzed to ascertain the accuracy of computational fluid dynamics (CFD) simulation first due to the setting of the grid which will directly affect the accuracy of the calculation results, especially the overset-grid convergence validation. Then, the change of water-entry impact force and velocity of AUH with different water-entry velocities and angles were calculated by CFD analysis software STAR-CCM + solver. The proper immersion angle of the AUH should be 75° under comprehensive analysis and comparison. Besides, the variations of pressure distribution of the AUH in the whole water-entry process were also obtained, which provides reference for the shape optimization in the future work. Keywords Computational fluid dynamics (CFD) · Water-entry impact force · Autonomous Underwater Helicopter (AUH) · Two-phase flow · Autonomous underwater vehicle (AUV) · Volume of Fluid (VOF) · Overset-grid technology
1 Introduction Marine resources, including the biological, chemical, mineral, and even sea water, own high value of research and development and are extremely valuable natural resources [1]. Designing a machine that can replace human beings for underwater detection and exploration has become increasingly important. In recent years, autonomous underwater vehicle (AUV) has attracted wide attention for it can perform underwater investigations such as ocean survey, seabed detection, and underwater rescue tasks [2]. AUVs have been widely used with real-time ability to exchange oceanographic information through the submarine network and achieve extensive range of activities [3–5]. However, the structure of traditional torpedo-shaped AUVs conforms the * Ying Chen [email protected] 1
Ocean College, Zhejiang University, Zhoushan 316000, China
truth of the poor maneuverability performance in sway and yaw at low speed due to the added mass and moment, and motion instability in heaving motion owing to control
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