Numerical and experimental investigations on higher harmonics induced by multiple horizontal cylinders

Li Qingxin; Ning Dezhi; Teng Bin

doi:10.3969/j.issn.0253-4193.2017.01.010

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Li Qingxin, Ning Dezhi, Teng Bin. Numerical and experimental investigations on higher harmonics induced by multiple horizontal cylinders[J]. Haiyang Xuebao, 2017, 39(1): 96-103. doi: 10.3969/j.issn.0253-4193.2017.01.010

Citation:

Li Qingxin, Ning Dezhi, Teng Bin. Numerical and experimental investigations on higher harmonics induced by multiple horizontal cylinders[J]. Haiyang Xuebao, 2017, 39(1): 96-103. doi: 10.3969/j.issn.0253-4193.2017.01.010

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Numerical and experimental investigations on higher harmonics induced by multiple horizontal cylinders

doi: 10.3969/j.issn.0253-4193.2017.01.010

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Received Date: 2016-04-27
Rev Recd Date: 2016-07-01

Abstract

Abstract

Based on potential flow theory, a numerical wave flume was founded to model the interaction of nonlinear waves and dual or triple submerged horizontal cylinders by using a time-domain higher-order boundary element method. The mixed Eulerian-Lagrangian technique was used for the refresh of free surface, and the 4th-order Runga-Kutta scheme was adopted for the time advance. The two-point method was adopted to separate the higher free harmonics from the downstream waves. Then the effects of interval of submerged objects and distribution scheme on the higher free harmonics were investigated. Meanwhile, physical tests were carried out for higher harmonics induced by multiple submerged objects in a wave flume. Good agreements between the numerical results and experimental data were obtained. It was found that higher free harmonic amplitude oscillates periodically with the variation of the interval in the dual cylinder system. And the reoccurrence interval is near to half wave length. In the triple cylinder system, higher free harmonics amplitude oscillates periodically with the first interval but decreases with the second interval.
- nonlinear numerical wave flume,
- multiple submerged objects,
- higher harmonics,
- physical tests,
- higher boundary element method

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References(14)

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