지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
We investigated the Reynolds number effects on the flow over a twisted offshore structure in the range of 3×10³≤Re≤1×10⁴. To analyze the effect of the twisted surface treatment, a large eddy simulation (LES) with a dynamic subgrid model was employed. A simulation of the cylindrical structure was also carried out to compare the results with those of the twisted offshore structure. As Re increased, the mean drag and lift coefficient of the twisted offshore structure increased with the same tendency as those of the cylindrical structure. However, the increases in the mean drag and lift coefficient of the twisted offshore structure were much smaller than those of the cylindrical structure. Furthermore, elongated shear layer and suppressed vortex shedding from the twisted offshore structure occurred compared to those of the cylindrical cylinder, resulting in a drag reduction and suppression of the vortex-induced vibration (VIV). In particular, the twisted offshore structure achieved a significant reduction of over 96% in VIV compared with that of the cylindrical structure, regardless of increasing Re. As a result, we concluded that the twisted offshore structure effectively controlled the flow structures with reductions in the drag and VIV compared with the cylindrical structure, irrespective of increasing Re.
목차
ABSTRACT
1. 서론
2. 수치해석 방법
3. 해석결과
4. 결론
References
참고문헌 (30)
참고문헌 신청
Ahmed, A. / 1992 / Transverse Flow over a Wavy Cylinder / Physics of Fluids A 4:1959~1967
Bishop, R. E. D. / 1964 / The Lift and Drag Forces on a Circular Cylinder in a Flowing Fluid / Proceedings of The Royal Society A 277(1368):32~50
Breuer, M. / 1998 / Large Dddy Simulation of the Subcritical Flow Past a Circular Cylinder : Mumerical and Modeling Aspects / International Journal for Numerical Methods in Fluids 28:1281~1302
Breuer, M. / 2000 / A Challenging Test Case for Large Eddy Simulation : High Reynolds Number Circular Cylinder / International Journal of Heat and Fluid Flow 21:648~654
Chyu, C. K. / 1996 / Near-wake Structure of an Oscillating Cylinder : Effect of Controlled Shear-layer Vortices / Journal of Fluid Mechanics 322:21~49
Bishop, R. E. D. / 1964 / The Lift and Drag Forces on a Circular Cylinder in a Flowing Fluid / Proceedings of The Royal Society A 277(1368):32~50
Breuer, M. / 1998 / Large Dddy Simulation of the Subcritical Flow Past a Circular Cylinder : Mumerical and Modeling Aspects / International Journal for Numerical Methods in Fluids 28:1281~1302
Breuer, M. / 2000 / A Challenging Test Case for Large Eddy Simulation : High Reynolds Number Circular Cylinder / International Journal of Heat and Fluid Flow 21:648~654
Chyu, C. K. / 1996 / Near-wake Structure of an Oscillating Cylinder : Effect of Controlled Shear-layer Vortices / Journal of Fluid Mechanics 322:21~49
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UCI(KEPA) : I410-ECN-0101-2016-559-001255419