基于重叠网格的船模停船操纵CFD数值模拟

CFD numerical simulations of stopping maneuver of ship model using overset grid technology

  • 摘要:
      目的  随着国际航运业的迅速发展,港口和航道变得日益拥堵,研究大型船舶的停船性能对于航行安全至关重要。
      方法  使用基于开源CFD软件OpenFOAM自主开发的naoe-FOAM-SJTU求解器,以及船舶六自由度运动和带桨多级物体运动求解模块,采用重叠网格技术,对带桨KVLCC2船模进行紧急停船操纵数值模拟。首先,控制螺旋桨转速,使船模达到稳定自航状态;然后,在某时刻控制螺旋桨倒转,以达到紧急停船操纵的目的。通过对全粘性流场的整体求解,给出船模自航以及停船操纵过程中的运动状态和细致流场信息,分析倒车效应产生的原因,并将数值预报结果与相关试验数据进行对比验证。
      结果  结果显示,数值预报结果与相关试验数据间误差在5%以内,证明采用naoe-FOAM-SJTU求解器对船舶倒车停船操纵问题进行数值预报是可靠的。
      结论  所采用的方法可针对停船问题为船舶前期设计和操纵方式的选择提供参考。

     

    Abstract:
      Objectives  With the development of international shipping, ports and waterways are becoming increasingly crowded. Study on stopping ability of large ships is crucial to their voyage safety.
      Methods  The naoe-FOAM-SJTU solver based on the CFD platform OpenFOAM and the ship 6-DOF motion and multi-level object with propeller motion solver module and the overset grid technology are used to numerically simulate the emergency stopping maneuver of KVLCC2 model with propeller. First, the rotation speed of propeller is controlled to achieve the steady self-propulsion state of the ship model; then the propeller is reversed at a moment speed to achieve the emergency stopping maneuver. By generally solving viscous flow field, the motion state and detailed flow field information of the ship model during self-propulsion and stopping maneuver are presented, the cause of reverse effect is analyzed, and the numerical prediction results are compared with the test data.
      Results  The results indicate that the discrepancy between numerical prediction results and test data is within 5% and that it is possible to numerically predict the reverse and stopping maneuver problems by using the naoe-FOAM-SJTU solver.
      Conclusions  The method adopted herein can provide reference for preliminary design and maneuver method of a ship in terms of ship stopping issues.

     

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