期刊
OCEAN ENGINEERING
卷 109, 期 -, 页码 270-286出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2015.09.013
关键词
Oscillatory flow; Circular cylinder; Navier-Stokes equations
资金
- Australia Research Council through ARC Discovery Project [DP110105171, DE150100428]
- ARC Linkage Projects Program [LP0989936]
- Australian Research Council [LP0989936] Funding Source: Australian Research Council
Oscillatory flow around a cylinder is simulated using both two- and three-dimensional finite element models at Re = 2000 and KC=1, 2, 5, 10, 17.5, 20 and 26.2. The same finite element method is used hi both the two- and three-dimensional models. The purpose of this study is to investigate the feasibility of a two-dimensional model for simulating a three-dimensional flow in terms of fundamental flow characteristics and hydrodynamic forces. The vortex structures predicted by the two-dimensional model agree qualitatively with those by the three-dimensional model for the flow conditions where strong correlations exist along the span-wise direction (KC=10, 17.5 and 26.2). Three vortex shedding modes are reproduced by both two- and three-dimensional models at KC=20, which is close to the critical KC number between double-and three-pair regimes. The time histories of hydrodynamic force predicted by the two models agree with each other at KC=20. The predicted Morison force coefficients by the two-dimensional model are within 18% different from those predicted using the three-dimensional model for most of the cases. The two-dimensional model captures the majority of the genuine flow structures and hydrodynamic loads of a circular cylinder in an oscillatory flow. (C) 2015 Elsevier Ltd. All rights reserved.
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