Abstract
This paper selects SST k-w turbulence model and VOF wave to construct a numerical calculation model of moving body planning on a flat free surface based on STAR-CCM+ numerical simulation software. The construction model is checked through foreign classic literature, and the numerical simulation results are in good agreement with the experimental results. The hydrodynamic numerical errors are less than 5%, which is within the engineering error range. The model can be used for the numerical simulation of the planning cylinder. In this paper, it is used to simulate the planing process of cylinder with different speeds and different submerged depths, and the flow field characteristics and hydrodynamic characteristics in the planing process are obtained. The results show that waves appear at the tail and the tail liquid splashes to form a water splash during the planing process of the cylinder on a flat surface. The higher the speed of the planning cylinder is, and the deeper the submersion depth, the more pronounced waves at the tail. When the cylinder has a Fr number Cv≥8, the hydrodynamic force of the cylinder is almost unchanged, and it is not affected by the speed. But when Cv=3, the hydrodynamic characteristic coefficient is higher. The drag coefficient is 20% higher than that in the high-speed (Cv≥8) planing process. The lift coefficient is 3 times of high-speed planing lift coefficient. It is related to the surface pressure and frictional force distribution of cylinder during the low-speed planing. There is a linear relationship between the drag coefficient and the submerged depth during the cylinder planing at different submerged depths.
Highlights
This paper selects SST k⁃w turbulence model and VOF wave to construct a numerical calculation model of moving body planning on a flat free surface based on STAR⁃CCM+ numerical simulation software
The construc⁃ tion model is checked through foreign classic literature, and the numerical simulation results are in good agreement with the experimental results
The hydrodynamic numerical errors are less than 5%, which is within the engineering error range
Summary
摘 要:基于 STAR⁃CCM+数值仿真软件,选用 SST k⁃w 湍流模型,采用 VOF 波构建运动体在静水面滑 水数值计算模型。 通过国外经典文献对构建模型进行校核,数值模拟结果与实验结果吻合性较好,流 体动力数值误差均小于 5%,在工程误差范围内,模型可用于回转体滑水航行工况的数值模拟计算。 对回转体在不同速度、不同淹没深度滑水工况进行数值模拟,研究其流场特性和流体动力特性。 结果 表明,回转体在静水面滑水过程中,尾部波浪兴起,液体飞溅形成水花,滑水速度越高、淹没深度越深, 尾部兴波越明显;回转体在 Cv≥8 时,流体动力系数几乎不变,其不受速度大小的影响,而在 Cv = 3 时, 流体动力系数较高,阻力系数高于高速(Cv≥8)滑水阻力系数 20%,升力系数是高速滑水升力系数的 3 倍,其与回转体在低速滑水过程中表面压力和摩擦力作用分布有关;回转体在不同淹没深度滑水过 程中,阻力系数与淹没深度呈线性关系。 对于大尺度回转体高速滑水问题的实验研究较 为困难,因此提出一种数值仿真的方法研究回转体 滑水问题尤为必要。 本文基于 STAR⁃CCM +数值仿 真软件,选用 k⁃w 湍流模型,采用 VOF 波,构建运动 体在静水面滑水数值计算模型。 对回转体在不同速 度、不同淹没深度滑水工况进行数值模拟,研究其滑 水过程中的流场特性和流体动力特性。 Ship Engineering, 2003, 25(4) :17⁃19 ( in Chinese) 中国舰船研究, 2018, 75( 4) : 81⁃87 ZHANG Mingxia, HAN Bingbing, LU Pengcheng, et al Numerical simulation for resistance of trimaran small waterplane area center hull based on STAR⁃CCM+[ J] .
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