Hysterical effects in flow structure behind a finite array of cylinders under gradually varying unsteady flow conditions

Eryilmaz Erdog, Oral Yagci*, V. S.Ozgur Kirca

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Özet

Recent investigations revealed that a group of cylinders offer more advantages than mono-pile when applied as a foundation for offshore wind turbines or pile-supported structures. In this context, the influence of gradually varying unsteady flow around a group of cylinder (Hexagonal arrays of circular cylinders, HACCs) was investigated by flume experiments. Reproducible gradually varying flow conditions were repeated in the flume for each point on the measurement grid distributed around the cylinder group. The dimensions of the recirculating flume, equipped with an electronically programmable discharge pump, were 30 m in length and 1 m in width. Spatio-temporal variations of the turbulence and mean flow quantities were obtained during the passage of the unsteady and steady flow. The experimental findings demonstrated that the velocity difference between contraction and wake regions is more significant during the falling stage of the unsteady flow than the rising stage for both arrangements of HACC. Besides, a hysterical counter-clockwise relationship between TKE and normalized streamwise velocity in the wake region of both cases of HACC was observed. Nevertheless, under steady flow conditions, while the regular array of HACC generates higher resistance compared to the unsteady case, the staggered array exhibited lower resistance.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)247-267
Sayfa sayısı21
DergiJournal of Ocean Engineering and Marine Energy
Hacim8
Basın numarası3
DOI'lar
Yayın durumuYayınlandı - Ağu 2022

Bibliyografik not

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

Finansman

The present study emanates from the Ph.D. thesis of the first author. The full set of data can directly be obtained from Ph.D. thesis which is currently in writing stage by Eryilmaz Erdog. The authors gratefully acknowledge the precise work and great efforts of technicians H. Yalçın and M. Uluçınar, who employ in Hydraulics Laboratory of Istanbul Technical University. The financial support from the Scientific Research Funding Program of Istanbul Technical University provided for the construction of the flume (ITU-BAP Program, MDK-2017-40708) is gratefully acknowledged. The present study emanates from the Ph.D. thesis of the first author. The full set of data can directly be obtained from Ph.D. thesis which is currently in writing stage by Eryilmaz Erdog. The authors gratefully acknowledge the precise work and great efforts of technicians H. Yalçın and M. Uluçınar, who employ in Hydraulics Laboratory of Istanbul Technical University. The financial support from the Scientific Research Funding Program of Istanbul Technical University provided for the construction of the flume (ITU-BAP Program, MDK-2017-40708) is gratefully acknowledged.

FinansörlerFinansör numarası
Eryilmaz Erdog
Istanbul Teknik ÜniversitesiMDK-2017-40708

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