ADV measurements of blockage flow effects near a model jacket in waves and current

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL
A.J. Archer , H.A. Wolgamot , J. Orszaghova , S. Dai , P.H. Taylor
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引用次数: 0

Abstract

Design standards for drag loading on offshore jacket structures do not presently account for the reduction in forces arising from flow blockage effects in the event of combined waves and current. This force reduction is believed to originate in reduced mean flow velocity through the jacket, but this has never been directly measured. To address this, we conducted physical-model tests which measured the flow adjacent to a jacket structure in combined waves and in-line currents using acoustic Doppler velocimeters. Results confirm a dramatic reduction in the mean flow velocity up-wave and down-wave of a model jacket in waves and current, far greater than the flow reduction observed in current alone. These results unambiguously confirm the significant additional blockage (and hence reduction in structural loads) not captured in current offshore design standards.

ADV 测量波浪和海流中模型夹套附近的阻塞流效应
目前,近海护套结构阻力载荷的设计标准没有考虑到在波浪和水流共同作用的情况下,因水流阻塞效应而产生的力的减小。这种力的减小被认为是由于通过夹套的平均流速降低所致,但这一点从未被直接测量过。为了解决这个问题,我们进行了物理模型试验,使用声学多普勒测速仪测量了波浪和直流共同作用下夹套结构附近的流动情况。结果证实,在波浪和水流作用下,模型夹套上波和下波的平均流速急剧下降,远大于仅在水流作用下观察到的流速下降。这些结果明确证实了目前的近海设计标准中没有考虑到的大量额外阻塞(从而减少了结构载荷)。
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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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