A nonlinear vortex induced vibration model of marine risers |
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Authors: | LIU Juan HUANG Weiping |
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Institution: | 1. Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, P.R. China;Construction Engineering Institute, Agricultural University of Qingdao, Qingdao 266009, P.R. China 2. Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, P.R. China |
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Abstract: | With the exploitation of oil and gas in deep water, the traditional vortex induced vibration (VIV) theory is challenged by the unprecedented flexibility of risers. A nonlinear time-dependent VIV model is developed in this paper based on a VIV lift force model and the Morison equation. Both the inline vibration induced by the flow due to vortex shedding and the fluid-structure interaction in the transverse direction are included in the model. One of the characteristics of the model is the response-dependent lift force with nonlinear damping, which is different from other VIV models. The calculations show that the model can well describe the VIV of deepwater risers with the results agreeing with those calculated by other models. |
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Keywords: | vortex-induced vibration fluid-structure interaction lift force nonlinear model |
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