3D Numerical Modeling and Geometry Optimization of an Oscillating Water Column Device in Sloshing Conditions Using Openfoam and Genetic Algorithms

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-01-01 DOI:10.47176/jafm.17.1.1867

†. S.S.Razavi, R. Shafaghat, B. A. Kharkeshi, J. Eskandari

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引用次数: 0

Abstract

Among various types of wave energy converters, the oscillating water column (OWC) has attracted significant research attention. In this paper, a 1:10 scale OWC with dimensions of 100×100×160 cm, variable inlet height and draft was numerically studied. Based on the tests conducted, it was found that the wave amplitude in the range of Caspian Sea waves decreased with the increase of wave frequency, to the extent that at the sloshing frequency, the system efficiency dropped significantly. To solve this problem, changes in the geometry of the device were studied, and numerical simulations were performed at the highest frequency using OpenFOAM software. Using Reynolds-averaged Navier-Stokes (RANS) equations, numerical simulations were performed in 3D, two-phase, and turbulent flow conditions. Changing the geometry was initially investigated by adjusting the height of the OWC inlet duct, and then by adding an inlet at the different angles of 0, 20, and 40 degrees. The results showed that by increasing the height of the inlet by 10 cm while keeping the water depth and wave conditions constant, the maximum output power of the system increased by 54%. However, after the optimization of the inlet duct, it was found that the best angle for an inlet duct is 30°, compared to the case without an inlet, which increased the maximum output power by up to 13% and slightly reduced the sloshing by more than 50%.

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使用 Openfoam 和遗传算法对滑动条件下的振荡水柱装置进行三维数值建模和几何优化

在各种类型的波浪能转换器中，振荡水柱（OWC）吸引了大量研究人员的关注。本文对尺寸为 100×100×160 厘米、进水口高度和吃水可变的 1:10 比例 OWC 进行了数值研究。根据试验发现，里海波浪范围内的波幅随着波频的增加而减小，以至于在荡波频率下，系统效率显著下降。为解决这一问题，研究人员研究了装置几何形状的变化，并使用 OpenFOAM 软件在最高频率下进行了数值模拟。使用雷诺平均纳维-斯托克斯（RANS）方程，在三维、两相和湍流条件下进行了数值模拟。首先通过调整 OWC 入口管道的高度来研究几何形状的变化，然后在 0 度、20 度和 40 度的不同角度增加一个入口。结果表明，在保持水深和波浪条件不变的情况下，将进气口高度增加 10 厘米，系统的最大输出功率增加了 54%。然而，在对进水口管道进行优化后发现，与不带进水口的情况相比，进水口管道的最佳角度为 30°，这使最大输出功率增加了 13%，并略微减少了 50%以上的淤积。

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 Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .