Analysis of turbulence on cylinder with additional fairing with free surface

Q3 Engineering

Journal of Mechanical Engineering Research and Developments Pub Date : 2021-04-07 DOI:10.30564/JMER.V4I1.2643

S. Chen, Xiaomin Li

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Abstract

Article history Received: 1 December 2020 Accepted: 27 January 2021 Published Online: 9 April 2021 In this study, two dimensional unsteady flows of cylinder and cylinder with additional fairing close to a free surface were numerically investigated. The governing momentum equations were solved by using the Semi Implicit Method for Pressure Linked Equations(SIMPLE). The Volume of Fluid(VOF) method applied to simulate a free surface. Nonuniform grid structures were used in the simulation with denser grids near the cylinder. Under the conditions of Reynolds number 150624, 271123, 210874 and 331373, the cylinders were simulated with different depths of invasion. It was shown that the flow characteristics were influenced by submergence depth and Reynolds numbers. When the cylinder close to the free surface, the drag coefficient, lift coefficient and Strouhal numbers will increase due to the effect of free liquid surface on vortex shedding. With additional fairing, can effectively reduce the influence of the free surface on the drag coefficient. Fairing will reduce lift coefficient at high Reynolds numbers, but increase lift coefficient when Reynolds numbers are small. Fairing can effectively reduce Strouhal numbers, thus can well suppress the vortex induced vibration.

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带有自由面附加整流罩的气缸湍流分析

文章发表日期:2020年12月1日接收日期:2021年1月27日出版日期:2021年4月9日在本研究中，数值研究了圆柱体和附加整流罩的圆柱体靠近自由表面的二维非定常流动。采用压力链方程半隐式方法求解控制动量方程。流体体积法(VOF)用于模拟自由表面。模拟中采用非均匀网格结构，圆柱附近网格密度较大。在雷诺数为150624、271123、210874和331373的条件下，分别模拟了不同侵深的圆柱体。结果表明，浸没深度和雷诺数对流动特性有显著影响。当气缸靠近自由液面时，由于自由液面对旋涡脱落的影响，阻力系数、升力系数和斯特罗哈尔数都会增加。带有附加整流罩，可有效降低自由面对阻力系数的影响。高雷诺数时，整流罩会降低升力系数，小雷诺数时，整流罩会提高升力系数。整流罩可以有效地降低斯特劳哈尔数，从而很好地抑制涡激振动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Mechanical Engineering Research and Developments Engineering-Computational Mechanics

自引率

0.00%

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审稿时长

9 weeks

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