含半开放水舱的船舶波浪特性数值分析

Numerical Simulation of Wave Characteristics of a Ship Containing Semi-Open Water Tank Based on Overset Grid

含有半开放水舱的船舶在实际波浪中航行时,由于船体运动和舱壁反射等而导致舱内波浪环境条件十分复杂,增加了小型船舶进该水舱内作业安全的不确定性。基于自研求解器naoe-FOAM-SJTU,并利用重叠网格技术对不规则波中含半开放水舱的船舶进行运动模拟。以船舶零航速迎浪时的模拟为基础分析半开放水舱内的波浪演化特性,研究不同航速和浪向对半开放水舱内波浪环境的影响。结果表明,在半开放水舱内波浪从舱尾到舱首呈现逐渐减小的趋势,航速增加后舱内波高明显降低,这在舱首尤为明显;随着浪向角的减小,舱内波高明显增加。已完成的计算工况表明,增加航速或浪向角可减小半开放水舱内波浪,从而降低小船驶入水舱内作业的风险,这项研究结果可为制定实际船舶的作业方案提供参考。

When a ship containing semi-open water tank is sailing across the sea,due to the motion of the hull and the reflection of the bulkhead,wave environment conditions in the water tank are complex,which increases the uncertainty of the performance and operation safety of small boats entering the water tank.Based on the solver naoe-FOAM-SJTU developed independently by the research group,motion simulation of ships in irregular waves is realized by using overset grid technique.Wave evolution characteristics in the semi-open water tank are analyzed on the basis of the simulation results for the ship at zero speed.Influence of ship speed and wave direction angle on the wave environment in the water tank is studied.Waves in the water tank gradually decreased from the stern to the bow,and wave height is significantly reduced as the speed increases,which are more obvious at the bow.As the wave angle decreases,wave height in the dock increases significantly.It can be known that increasing ship speed or wave direction angle can reduce waves in the semi-open water tank so as to reduce the risk of small boats entering water tank.The research results may provide a reference for actual ship operation plans.