低雷诺数下并列圆柱涡激振动的数值模拟及其机理研究
发布时间：2018-10-09 19:34
【摘要】：全球的海流能源非常丰富，但传统形式的海流能利用装置很难适应低流速海流。近年来，一种利用圆柱阵列的涡激振动将低流速海流能转化为电能的高效率利用装置——VIVACE (Vortex Induced Vibration Aquatic CleanEnergy)，逐步得到了学术和工业界的重视，，应用前景非常广阔。基于以上研究背景，本文对最简单的圆柱阵列——并列双圆柱涡激振动开展了数值模拟。 本文采用基于LES的高效能紊流并行计算程序——CgLes，对弹性支承并列刚性双圆柱在不可压缩粘性流体中的涡激振动现象进行了数值模拟。流体运动的控制方程为Navier-Stokes方程，物体运动的控制方程为牛顿第二定律，应用嵌入式迭代浸入边界法来处理流固耦合问题。 基于上述计算程序，在低雷诺数(Re=100)和低圆柱质量比(m*2)条件下，对不同折合流速U r和不同横流向间距比T/D工况下的并列双圆柱涡激振动进行了数值模拟，得到了两个圆柱的无量纲动力特性参数：升阻力系数、无量纲振幅、斯特劳哈尔数，同时系统分析了折合流速、间距比的变化对这些参量的影响。通过归纳两圆柱之间的振动形式与漩涡作用方式的关系，得出并列双圆柱涡激振动三种形式的尾流模态。本文亦对两圆柱之间的耦合作用进行了分析和总结。
[Abstract]:The global current energy is very rich, but the traditional current energy utilization device is difficult to adapt to the low flow current. In recent years, Vivace (Vortex Induced Vibration Aquatic CleanEnergy), an efficient device for converting low velocity ocean current energy into electric energy by using vortex vibration of cylindrical arrays, has been paid more and more attention by academic and industrial circles, and its application prospect is very broad. Based on the above research background, numerical simulation of vortex-induced vibration of the most simple cylindrical array-parallel two cylinders is carried out in this paper. In this paper, the vortex-induced vibration of elastic supports and rigid double cylinders in incompressible viscous fluid is numerically simulated by using the parallel program of high efficiency turbulent flow based on LES. The governing equation of fluid motion is Navier-Stokes equation and the control equation of body motion is Newton's second law. The embedded iterative immersion boundary method is used to deal with the fluid-solid coupling problem. Based on the above calculation program, the vortex-induced vibration of two parallel cylinders under the conditions of low Reynolds number (Re=100) and low cylinder mass ratio (mm2) is numerically simulated under the conditions of different reduced velocities U r and different cross flow spacing ratios T / D. The dimensionless dynamic characteristic parameters of two cylinders are obtained: lift resistance coefficient, dimensionless amplitude and Straugher number. The effects of the variation of velocity and spacing ratio on these parameters are analyzed systematically. By summarizing the relationship between the vibration form of two cylinders and the action mode of swirl, three kinds of wake modes of the vortex-induced vibration of two parallel cylinders are obtained. The coupling between two cylinders is also analyzed and summarized in this paper.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P743.1
本文编号：2260523
[Abstract]:The global current energy is very rich, but the traditional current energy utilization device is difficult to adapt to the low flow current. In recent years, Vivace (Vortex Induced Vibration Aquatic CleanEnergy), an efficient device for converting low velocity ocean current energy into electric energy by using vortex vibration of cylindrical arrays, has been paid more and more attention by academic and industrial circles, and its application prospect is very broad. Based on the above research background, numerical simulation of vortex-induced vibration of the most simple cylindrical array-parallel two cylinders is carried out in this paper. In this paper, the vortex-induced vibration of elastic supports and rigid double cylinders in incompressible viscous fluid is numerically simulated by using the parallel program of high efficiency turbulent flow based on LES. The governing equation of fluid motion is Navier-Stokes equation and the control equation of body motion is Newton's second law. The embedded iterative immersion boundary method is used to deal with the fluid-solid coupling problem. Based on the above calculation program, the vortex-induced vibration of two parallel cylinders under the conditions of low Reynolds number (Re=100) and low cylinder mass ratio (mm2) is numerically simulated under the conditions of different reduced velocities U r and different cross flow spacing ratios T / D. The dimensionless dynamic characteristic parameters of two cylinders are obtained: lift resistance coefficient, dimensionless amplitude and Straugher number. The effects of the variation of velocity and spacing ratio on these parameters are analyzed systematically. By summarizing the relationship between the vibration form of two cylinders and the action mode of swirl, three kinds of wake modes of the vortex-induced vibration of two parallel cylinders are obtained. The coupling between two cylinders is also analyzed and summarized in this paper.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P743.1
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本文编号：2260523
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