Title: Wave making characteristics of submerged vehicle in a stratified ocean

Authors: Dawei Li; Guijuan Li; Zhenshan Wang; Lin Sun; Lixun Xie

Addresses: Science and Technology on Underwater Test and Control Laboratory, 16# Binhai Street, Dalian, China ' Science and Technology on Underwater Test and Control Laboratory, 16# Binhai Street, Dalian, China ' Science and Technology on Underwater Test and Control Laboratory, 16# Binhai Street, Dalian, China ' Science and Technology on Underwater Test and Control Laboratory, 16# Binhai Street, Dalian, China ' Science and Technology on Underwater Test and Control Laboratory, 16# Binhai Street, Dalian, China

Abstract: The numerical methods are used to obtain the wave making characteristics of pycnocline interface and free surface in a stratified ocean, the disturbance source is a submerged vehicle (SUBOFF). The unsteady viscous numerical method based on 3-D incompressible RANS equations, re-normalisation group theory k-ε turbulence model and volume of fluid method are used to simulate the fluid characteristics of the submerged body moving in a stratified ocean. Two ocean layers with finite depth and different densities are considered. Typical Froude numbers of flow vary between 0.05 and 2. The simulated results show that the wave making characteristics on the surface and interface contain contributions from two different modes: a surface-wave mode and an internal-wave mode. It is observed that there is a large effect of submerged body velocity on the wave systems, structures of free surface and pycnocline interface. The typical wavelength of the interface is predicted to increase with Froude number, which is in agreement with the theory.

Keywords: submerged vehicle; stratified ocean; interface wave mode; surface wave mode; computational fluid dynamics; CFD.

DOI: 10.1504/PCFD.2020.108514

Progress in Computational Fluid Dynamics, An International Journal, 2020 Vol.20 No.4, pp.222 - 230

Received: 04 Jun 2018
Accepted: 29 Aug 2019
Published online: 15 Jul 2020 *

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