月池对船舶水动力导数影响研究

Influence of moonpool on hydrodynamic derivatives of ship

为了对带月池船舶的操纵水动力进行预报,运用CFD技术和重叠网格技术,以深拖母船为研究对象,数值模拟船舶的斜航运动、纯横荡运动和纯首摇运动。将测得的力和力矩进行处理,分别计算出了月池打开和封闭时的水动力导数。通过对比数值计算结果与势流理论计算结果,验证了该方法的合理性和有效性。通过比较月池封闭和打开时的水动力导数,发现大部分水动力导数都因为月池的存在而有所增加,这为预报带月池船舶的操纵性提供参考。

In order to predict the maneuvering hydrodynamic force of ships with moonpool, this paper applies CFD technology and the overlapping grid technique. Taking the towed system on mother ship as study object, oblique towing,pure sway and pure yaw tests are performed under a series of designated condition. The measured forces and moments are processed and hence the hydrodynamic derivatives of the moonpool open and closed are calculated separately. By means of comparing the simulation results with results calculated by potential flow theory, the rationality and validity of the method are verified. By comparing the hydrodynamic derivatives when the moonpool was closed and opened, most of the hydrodynamic derivatives were found to have increased due to the existence of the moonpool, which provided a reference for predicting the maneuverability of ships with moonpool.