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굽은 형상을 가지는 라이저 주위 유동 특성에 관한 연구Numerical Study on Flow Characteristics Around Curved Riser

Other Titles
Numerical Study on Flow Characteristics Around Curved Riser
Authors
정재환오승훈남보우박병원권용주정동호
Issue Date
2019
Publisher
한국해양공학회
Keywords
Curved riser 굽은 라이저; Flow incident angle 유동 입사각; Sectional force coefficients 단면별 유체력 계수
Citation
한국해양공학회지, v.33, no.2, pp 123 - 130
Pages
8
Journal Title
한국해양공학회지
Volume
33
Number
2
Start Page
123
End Page
130
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/371
DOI
10.26748/KSOE.2018.079
ISSN
1225-0767
2287-6715
Abstract
The flow around a curved riser exposed to the current in various directions was investigated at a Reynolds number of 100 using a numerical simulation. The present study found that the flow features of the curved riser were distinct from those of a straight riser as a result of its large radius of curvature. Namely, there were various wake patterns according to the flow’s incident angle. As the incident angle increased from 0° to 90°, a two-row street of vortices that developed along the centerline of the curved riser became more apparent. However, when the incident angle approached 180° from 90°, these vortices were completely suppressed by the interaction between the wake and an axial flow induced by the curvature of the riser. To identify this feature, the sectional force coefficients were also considered, and it was found that the force coefficients could be different from those found in a sectional analysis based on the strip theory when investigating vortex-induced vibration. As a result, this kind of study would be important to realistically estimate the riser VIV (vortex-induced vibration) and fatigue life, and a new force coefficient database that includes the three-dimensional effect should be established.
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