一种基于计算流体力学的三维船舶横摇阻尼预报方法

针对三维船体强迫振荡运动，以黏性流理论为基础，通过求解雷诺平均纳维 斯托克斯(Reynolds averaged Navier Stokes,RANS)方程，计及自由面影响情况，对S60船在有航速和无航速时不同幅值的横摇运动进行了数值模拟.分析计算了三维船模的横摇阻尼系数，研究了横摇幅值和航速对横摇阻尼的影响，并与试验值和势流计算值进行了比较.结果表明，数值模拟能够显现出船体流场非线性特征以及黏性的影响，横摇阻尼系数与试验值吻合良好，较势流方法预报更为准确，可广泛应用于船舶与海洋工程浮式结构物的水动力性能分析研究.

A Roll Damping Prediction Method of Three-Dimensional Ships Based on CFD Computation

Based on viscous flow theory, the simulations of forced roll of Series 60 were carried out by solving Reynolds averaged Navier Stokes(RANS) equations with consideration of free surface effect. Roll damping coefficients of three dimensional ship body rolling at various frequencies and amplitudes which moves with and without forward speed were calculated. The influences of ship roll damping due to amplitudes and frequencies were analyzed. Comparisons of the numerical results of ship roll damping with experimental and potential theoretical ones were conducted. It shows that the presented computational method can give quite precise roll damping coefficients, which are better than the ones by potential theory and agree well with the corresponding experimental ones. It is of great significance to further analyze and predict ship hydrodynamic performance in waves.