Abstract
The hydrodynamic performance of a novel hovering autonomous underwater vehicle, the autonomous underwater helicopter (AUH), with an original disk-shaped hull (HG1) and an improved fore–aft asymmetric hull (HG3), is investigated by means of computational fluid dynamics with the adoption of overlapping mesh method. The hydrodynamic performance of the two hull shapes in surge motion with variation of the angle of attack is compared. The results show that HG3 has less resistance and higher motion stability compared to HG1. With the angle of attack reaching 10 degrees, both HG1 and HG3 achieve the maximum lift-to-drag ratio, which is higher for HG3 compared to HG1. Furthermore, based on the numerical simulation of the plane motion mechanism test (PMM) and according to Routh’s stability criterion, the horizontal movement and vertical movement stability indexes of HG1 and HG3 (GHHG1=1.0, GVHG1=49.7, GHHG2=1.0, GVHG3=2.1) are obtained, which further show that the AUH has better vertical movement stability than the torpedo-shaped AUV. Furthermore, the scale model tail velocity experiment indirectly shows that HG3 has better hydrodynamic performance than HG1.
Highlights
Accepted: 15 December 2021The seabed observation network is a platform to realize all-weather, in situ, long-term, continuous, real-time, and high-resolution observation from the seabed to the sea surface, which plays an important role in supporting the development of marine science [1,2]
0.01Hydrodynamic s to 0.05 s are used during for theMotions calculation
The hydrodynamic resistance of the fully disk-shaped HG1 moving 2 m/s horizonshown in Figure 5, tally the with time-averaged value of Fx using calculated by the two kinds ofismeshes zero angle of attack is calculated the overlapping mesh method, which compared to the simulation result with fixed meshes
Summary
The seabed observation network is a platform to realize all-weather, in situ, long-term, continuous, real-time, and high-resolution observation from the seabed to the sea surface, which plays an important role in supporting the development of marine science [1,2]. Cruise Speed (m/s)in oceanographic sensing and data collection [12], equipped with temperature salt depth Their buoyancy and converting the lift on the wings into propulsive force without a power propulsion system [13], which, limits their operation under complex seabed conditions. An et al [28] proposed still lacking on the location optimization of the hull shape to improve the hydrodynamic a parametric representation of the AUH’s profile and combined the surrogate model with property the AUH. Stability tively, are calculated numerically based on the overlapping mesh technology and the
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