| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 101 === The interaction between structures and fluid flow receives more attention in offshore engineering in the past decades. For example, the simulation of an oscillatory flow past a cylinder array is used to predict the hydrodynamic loading of a tension-leg platform (TLP)from progressive waves. A TLP usually has more than one cylinder as the framework to encounter oscillatory flow form waves. However, the design of an array of three cylinders in a regular triangle arrangement in oscillatory flow is rarely studied. Therefore, the main objective of this study is to present the simulation of the interaction between the oscillatory flow and arrays of three cylinders in a triangular arrangement using the direct forcing immersed boundary method. A virtual force base on the rate of momentum changes of a solid body is added to the momentum equations of fluid. Consequently, this method can solve the force caused by the solid body immersed in fluid cells. In this study, the results include the effects of Keulegan-Carpenter number (KC), pitch ration (P/D), and symmetry of the arrangement. the difference between arrays of three and four cylinders is investigated. The arrangement of the array of four cylinders is similar to the array of three cylinders that all cylinders are symmetric with respect to the in-line direction. The proposed approach can be useful for scientists and engineers who would like to understand the interaction of the oscillatory flow with the cylinder array or to estimate hydrodynamic loading on the array of cylinders.
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