斜航航态下科考船船首区域流场特性研究

Study on Characteristics of Forward Area of Research Ship under Oblique Navigation State

为研究斜航航态下科考船船首流场气泡下扫对声学科考设备的影响,本文基于计算流体动力学方法,应用CFD仿真软件求解不可压缩流体N-S方程,并结合DES方法和SST k-ω湍流模型开展“中山大学”号科考船模型在20°斜航航态下船首区域绕流场数值研究。首先通过DTMB5512标模试验对比验证了数值方法的准确性;然后基于“中山大学”号船首区域流场数值计算结果,分析了x和y方向速度分布的形成原因及发展趋势;利用z方向速度和压力场结果,结合流线分布,对比了不同航态下左右舷的流线下扫情况,分析了流线分布的形成;最后通过涡结构的分布和涡量场,探究了船首泄出涡和舭涡的发展及其对区域流场的影响。

In order to study the influence of the bubbles sweeping down in the bow flow field of the scientific research ship on the acoustic equipment in the oblique navigation state,based on the computational fluid dynamics method,this paper uses CFD simulation software to solve the incompressible fluid N-S equation and combines the DES method and SST k-o turbulence model to carry out the numerical study of the flow field around the bow area of the'Sun Yat-sen University'scientific research ship model at 20°oblique navigation.In this study,the accuracy of the numerical method was first verified by comparing the DTMB5512 standard mold test.Then,based on the numerical calculation results of"Sun Yat-sen University"model,the formation reasons and development trends of velocity distribution in the x-axis and y-axis directions were analyzed.Using the results of z-axis speed and pressure field,combined with the streamline distribution,the streamlined sweep of the left and right sides under this navigation states was compared,and the formation of the streamline distribution was analyzed.Through the distribution of vortex structure and vortex field,the development of bow discharge vortex and ruddy vortex and their influence on regional flow field were explored.