基于CFD的内倾船迎浪中纵向非线性运动研究

Study on the Longitudinal Nonlinear Motion of the Tumblehome Hull in Head Wave Based on CFD

相比传统船型而言,有航速内倾船在大波陡波浪中,纵向运动可能会产生甲板上浪和非线性水动力问题.以DTMB 5613船模为研究对象,运用CFD软件OpenFOAM开展了Fr=0,0.2及0.367,波陡H/λ=0.01,0.025及0.05的迎浪规则波下内倾船纵摇和垂荡运动的数值模拟.结果表明,高航速内倾船在大波陡波浪中的纵向运动具有强烈的非线性,船体的内倾设计引起的甲板上浪等非线性现象是导致船体纵向运动非线性的主要因素.

Compared with the traditional ship, in the highly steep wave, the vertical movement of speeding tumblehome hull may produce green water and nonlinear hydrodynamic problems. Taking the DTMB 5613 model as the research object, the CFD software OpenFOAM is used to carry out the numerical simulation of pitch and heave under the Froude number Fr=0, 0.2 and 0. 367, wave steep- ness H/λ=0.01,0.025 and 0.05. The results show that the longitudinal motion of the high speed tumblehome hull in the highly steep wave is strongly nonlinear. The non-linearity phenomena such as the wave on the deck caused by the tumblehome design of the hull are the main factors leading to the nonlinearity of the longitudinal motion.