静水中航行姿态对带月池船舶阻力敏感性的研究

Study on Sensitivity of Navigation Attitude to Ship Resistance with Moonpool in Calm Water

月池的存在会影响船舶纵摇和垂荡,进而影响其航行姿态。论文基于黏流理论、有限体积法和重叠网格技术,构建了带月池船舶在固定状态及放开垂荡、纵摇自由度时的阻力预报数值方法,分析这两种状态下总阻力的差异。在拖曳水池中进行了带月池船舶在自由浮动状态下的静水阻力试验,对数值计算方法的准确性进行验证。研究表明,预报带月池船舶的阻力不能忽略船体航行姿态的影响。未考虑航行姿态时,数值预报与模型试验数据的差距最大为12.6%;考虑航行姿态时,两者的差距最大为5.3%。在中、高航速下预报带月池船舶阻力时应考虑航行姿态对船舶阻力的影响。

The existence of the moonpool will aggravate the influence of the ship's pitch and heave,and then affect the ship's navigation attitude.Based on the viscous flow theory and the finite volume method,a numerical method predicting the resistance of ships with moonpools in a fixed state or free heave and pitch degrees of freedom is constructed.The difference of total resistance predicted with numerical method between two towing conditions is analyzed.A resistance test of the ship with a moonpool in calm water under free-floating conditions is carried out in the towing tank,which shows that the influence of navigation attitude can’t be ignored.If the navigation attitude is not considered,the maximum difference between the numerical prediction and the model test will be 12.6%.When considering the navigation attitude,the maximum difference between the numerical prediction and the model test is 5.3%.The influence of navigation attitude on ship resistance should be considered in the prediction of ship resistance with a moonpool at medium and high speed.