Session: 08-07-02 Internal Flows & FIV II

Paper Number: 79791

79791 - Study on the Hydrodynamic Coefficients of a Submarine in the Density Stratified Flow 

Abstract: Because of the difference in temperature and salinity, there are density stratifications in the real ocean environment. Under this situation, any disturbance may excite internal waves. In the density stratified flow, the safe operation of submarine will be influenced by internal waves. In recent years, more and more researchers had paid attention to this issue.

This paper takes the SUBOFF submarine model as the research object. The CFD method is used to study the flow field and the hydrodynamic coefficients of the submarine. Reynolds Average Navier-Stokes (RANS) method is used to simulate the wake fields of submarine traveling in stratified fluids. The volume of fluid (VOF) method is used to capture the body-generated internal wave. Uncertainty analysis of grid size and time step are carried out to obtain the covergent results. The effects of the distances from interfaces and density of stratified fluid on the wave pattern of submarine are investigated. Submarine motion is numerically simulated by combining DFBI method and overset grid technology. The hydrodynamic coefficients of the submarine were obtained through the plane motion mechanism (PMM) in virtual tank taking the effect of density stratification into consideration. By comparing the hydrodynamic coefficients of the submarine under different densities and depths, the hydrodynamic characteristics of the submarine in stratified flow were investigated in details.

Keywords: internal wave; submarine; hydrodynamic coefficients; RANS; PMM;

Presenting Author: Guohua Dong Huazhong University of science and technology

Authors:

Guohua Dong Huazhong University of science and technology
Chaobang Yao Hubei Key Laboratory of Naval Architecture and Oceaning Engineering Hydrodynamics(HUST),Wuhan,China
Dakui Feng Huazhong University of science and technology
Guangli Zhou China Marine Development and Research Center, Bejing China