基于AQWA与理论计算相结合的船波运动研究.pdf

基于AQWA 与理论计算相结合的船波运动研究 [刘正国] [武汉理工大学交通学院 ，430063] [ 摘 要 ] 在分析船舶在波浪中运动的三维线性势流理论的基础上，介绍了基于势流理论的数值计算方 法，用理论推导了船体纵向剖面船波相对运动表达式，对某宽扁肥大型江海直达船进行了运动 仿真研究并结合推导式进行了船波相对运动的运动影响参数研究。仿真分析中，船体网格大小 变化对仿真结果影响很小，运动仿真结果与试验结果取得很好的一致性并达到一定的工程精 度，船体重心高度对船波相对运动影响不明显，纵向惯性半径和航速对船波相对运动影响较大， 每个航速下都会有不同惯性半径对应的相对运动峰值，峰值与航速呈线性关系。 [ 关键词 ] 势流理论；数值计算；江海直达船；船波相对运动 Research on relative motion between ship ’water plane and wave-surface by using AWQA program and theoretical calculation [Zhenng-guo LIU] [School of Transportation, Wuhan University of Technology,430063] [ Abstract ] Three dimensional potential flow theory and numerical calculation method which are used for ship motion analysis in wave are introduced. An expression used for calculating relative motion between ship’s water plane and wave-surface was got by theoretical derivation. A typical motion simulation was carried out on River-to-Sea ship using AQWA, and the motion between ship’s water plane and wave-surface was calculated. Studies have shown that unit size have little impact on accuracy, motion simulation result has good consistency with the test result and achieved high accuracy in engineering. The influence to the relative motion caused by height of gravity center, radius of inertia and speed was studied. A significant formula was obtained. [ Keyword ] potential flow theory; numerical calculation method; River-to-Sea ship; relative motion between ship’s water plane and wave-surface. 1 前言 在波浪中航行的船舶受波浪的作用而产生与波面之间的相对运动，当这种相对运动达 到一定的程度会造成船底出水，船底出水再入水时，船体结构从低密度的空气介质瞬间进 入较高密度水介质，这时会在船底产生瞬间冲击压力，并伴随水花飞溅，这