Effects of Bulbous Bow on Cross-Flow Vortex Structures Around a Streamlined Submersible Body at Intermediate Pitch Maneuver： A Numerical Investigation

在在一个中间的入射角的优化身体附近的一块流动地被跨流动的分离和旋涡的流动地统治。分开的流动在身体的 leeside 上导致一双旋涡；因此，精确地决定这对并且估计它的尺寸和地点是必要的。这研究基于 RANS 方程利用基于元素的有限体积方法在 SUBOFF 赤裸的 submarined 壳附近计算 3D axisymmetric 流动。跨流动的旋涡结构然后数字地与 SUBOFF 和 DRDC STR 弓为一艘潜水艇被模仿并且比较。计算结果迫使并且砍旋涡结构的壳表面和力量和地点上的压力分发在 20 的一个中间的发生角度被介绍？？

A flow field around a streamlined body at an intermediate angle of incidence is dominated by cross-flow separation and vortical flow fields. The separated flow leads to a pair of vortices on the leeside of the body; therefore, it is essential to accurately determine this pair and estimate its size and location. This study utilizes the element-based finite volume method based on RANS equations to compute a 3D axisymmetric flow around a SUBOFF bare submarined hull. Cross-flow vortex structures are then numerically simulated and compared for a submarine with SUBOFF and DRDC STR bows. Computed results of pressure and shear stress distribution on the hull surface and the strength and locations of the vortex structures are presented at an intermediate incidence angle of 20°. A wind tunnel experiment is also conducted to experimentally visualize the vortex structures and measure their core locations. These experimental results are compared with the numerical data, and a good agreement is found.