【摘要】：全球的海流能源非常豐富，但傳統(tǒng)形式的海流能利用裝置很難適應低流速海流。近年來，一種利用圓柱陣列的渦激振動將低流速海流能轉(zhuǎn)化為電能的高效率利用裝置——VIVACE (Vortex Induced Vibration Aquatic CleanEnergy)，逐步得到了學術和工業(yè)界的重視，，應用前景非常廣闊�；谝陨涎芯勘尘�，本文對最簡單的圓柱陣列——并列雙圓柱渦激振動開展了數(shù)值模擬。 本文采用基于LES的高效能紊流并行計算程序——CgLes，對彈性支承并列剛性雙圓柱在不可壓縮粘性流體中的渦激振動現(xiàn)象進行了數(shù)值模擬。流體運動的控制方程為Navier-Stokes方程，物體運動的控制方程為牛頓第二定律，應用嵌入式迭代浸入邊界法來處理流固耦合問題。 基于上述計算程序，在低雷諾數(shù)(Re=100)和低圓柱質(zhì)量比(m*2)條件下，對不同折合流速U r和不同橫流向間距比T/D工況下的并列雙圓柱渦激振動進行了數(shù)值模擬，得到了兩個圓柱的無量綱動力特性參數(shù)：升阻力系數(shù)、無量綱振幅、斯特勞哈爾數(shù)，同時系統(tǒng)分析了折合流速、間距比的變化對這些參量的影響。通過歸納兩圓柱之間的振動形式與漩渦作用方式的關系，得出并列雙圓柱渦激振動三種形式的尾流模態(tài)。本文亦對兩圓柱之間的耦合作用進行了分析和總結。
[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.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P743.1

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本文編號：2260523