Morison方程水动力系数归一化的探讨

Aspect of the Normalization of Hydrodynamic Coefficients in Morison Equation

Morison方程中水动力系数C_d及C_m不仅与小尺度构件的外形.它在水中放置状态以及Kc数和Re数有关,而且通常认为还随环境条件的不同而改变,即规则波与不规则波的系数不相同、纯波与波流共存的系数亦不同.本文探讨了将环境条件差异而造成水动力系数的变化,归化为Kc数的恰当定义和不规则波特征波的恰当选用,从而得到规则波与不规则波、纯波与波流共存不同条件下归一化的水动力系数C_d、C_m.与Kc数的相关结果.

The hydrodynamic coefficients Cd and Cm are dependent not only to the size of slender cylinders, its location in water, Kc number and Re number, but also be changed in various environmental condition; i. e. in regular waves or in irregular waves, in pure waves or in wave-current coexisisting field, the hydrodynamic coef-ficients will be different. In this paper, the problem of how to unify the hydrodynamic coefficients in various en-vironmental condition are discussed. When the proper definition of Kc number and proper characteristic values of irregular waves were used, a unified relationship between Cd, Cm and Kc number for regular waves, irregular waves, pure waves and wave-current coexisting field can be obtained.