Investigation of hydrodynamic and aerodynamic characteristics of tunnel of planing trimaran

被引：0

作者：

Zhang, Lili ^{[1
]}

Sun, Hanbing ^{[1
]}

Jiang, Yi ^{[1
]}

Song, Ruxin ^{[1
]}

Zou, Jin ^{[1
]}

机构：

[1] College of Shipbuilding Engineering, Harbin Engineering University, Harbin,150001, China

来源：

Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2017年 / 38卷 / 01期

关键词：

Numerical models - Froude number - Hydrodynamics - Lift - Tunnels;

D O I：

10.11990/jheu.201604071

中图分类号：

学科分类号：

摘要：

In order to study the hydrodynamic and aerodynamic mechanisms of the tunnel of a planning trimaran, we used the computational fluid dynamics (CFD) software CFX to simulate the 2-DOF forward motion of the planing trimaran in calm water at volume-based Froude numbers Fr ranging from 3.14 to 5.83. We used the wave generating characteristics of both the model tests and numerical simulations to analyze the hydrodynamic and aerodynamic tunnel lift changes with navigation speed. Our calculated results show that the tunnel is entirely ventilated at a Froude number of 5.83, and that the aerodynamic force, which mainly acts on the straight section of the tunnel, provides most of the tunnel lift when the Froude number is above 4.04. The calculated results for models with different straight section lengths show that lengthening the straight section may increase tunnel lift to achieve an average drag reduction of 6.0%. However, this also decreases the tunnel trim moment and thus negatively affects the high speed motion stability. Shortening the straight section decreases the tunnel lift and results in an average drag increase of 3.7%, while slightly improving the longitudinal stability. © 2017, Editorial Department of Journal of HEU. All right reserved.

引用

页码：31 / 36