Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Three-Dimensional Flow Response Analysis of Subsea Riser Transporting Deep Ocean Water

심층수 취수용 해저 라이저의 3차원 흐름 응답해석

  • Hwang, Hajung (Department of Ocean Engineering, Pukyong National University) ;
  • Woo, Jinho (Department of Ocean Engineering, Pukyong National University) ;
  • Na, Won-Bae (Department of Ocean Engineering, Pukyong National University) ;
  • Kim, Hyeon-Ju (Korea Research Institute of Ships & Ocean Engineering KRISO)
  • Received : 2014.11.27
  • Accepted : 2015.04.10
  • Published : 2015.04.30
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Abstract

This study presents a 3-dimensional flow-structure interaction analysis of subsea risers in water flows. Two structural connectors (flat and circular couplers) were intentionally devised and numerically tested using ANSYS CFX to investigate how these couplers behave under the water flows. In the flow analysis, the water field was constructed with an inlet, outlet, and symmetric boundary conditions. As a result, the responses (drag coefficients and pressure fields) were obtained and the pressure fields were applied for the structural analysis. Finally, the structural responses (displacements and equivalent stresses) of the risers were measured to demonstrate the efficiency of the riser connectors.

본 연구에서는 연결재(커플러)로 결합된 라이저의 외부흐름에 따른 3차원 유동-구조 연동해석을 수행하였다. 두 가지 연결재(평면 커플러, 곡면 커플러)를 고려하였으며 ANSYS CFX를 사용하여 수치해석을 수행하였다. 유동해석에서 유동공간은 유입구, 유출구와 대칭 경계조건으로 구성되었으며 연결재의 형상에 따른 항력계수와 유속 분포 결과를 비교하였다. 구조해석에서는 라이저의 응답(최대 변위 및 최대 등가응력)을 통해 연결재의 유용성을 확인하였다.

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References

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