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Predictions and Model Tests of a SCR undergoing VIV in Flow at Oblique Angles


The paper describes how an existing computer code, VICoMo, see Moe & Arntsen (2002), has been extended to analyse Vortex Induced Vibrations (VIV) of SCR's for situations in which the flow is neither in the plane of the riser, nor perpendicular to it. Various strategies were attempted in order to make the solution deal with flows at oblique angles. It was found that the best approach was to assume that the riser motions occurred in plane perpendicular to the flow, while motions in the flow direction were disregarded. One source of uncertainty is associated with the empirical database in VICoMo which is based on tests in which the flow was perpendicular to the riser elements. The timeseries from the experiment showed large temporal variations. Actually the average motions amplitudes at given points may be as low half of the maximum value. Also the largest amplitudes at different points on the experimental envelope on the riser will usually have been reached at quite different times. These features were not included in the theoretical model, and made direct comparisons between predictions and measurements difficult. We ended up comparing the envelopes of motion response. In several of the cases the predictions matched the experiments closely, for frequency, modeshape as well as amplitudes. In other cases the match was somewhat less satisfactory, however.......

【作者名称】: Geir Moe, Torbjorn Teigen, Halvor Lie
【作者单位】: NTNU, Norway, Paolo Simantiras and Neil Willis, 2H Offshore Engineering Ltd, UK
【关 键 词】: Predictions and Model Tests of a SCR undergoing VIV in Flow at Oblique Angles
【会议名称】: International Conference on Offshore Mechanics and Arctic Engineering 2004(OMAE 2004) vol.1 pt.B; 20040620-25; Vancouver(CA)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 100,926,462
【摘要长度】: 1,373
【会议地点】: Vancouver(CA)
【会议组织】: NTNU, Norway, Paolo Simantiras and Neil Willis, 2H Offshore Engineering Ltd, UK
【会议时间】: 2004
【上篇论文】: 外文会议 - On use of Starlette and Stella Laser measurements in determination of Earth Orientation Parameters (EOP) and SLR stations' coordinates
【下篇论文】: 外文会议 - COMPARISON BETWEEN PREDICTED AND MEASURED UMBILICAL BENDING STRESSES DURING MANUFACTURING

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