Development and verification of modeling practice for numerical estimation of wind loads on offshore floating structures
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
Mean wind load on a semi-submersible rig and an FPSO was investigated by using Computational Fluid Dynamics (CFD) for the modeling practice developed in Reproducible Offshore CFD JIP. The modeling practice is benchmarked against available model test results for a semi-submersible rig and an FPSO in blind manner between verifiers. For the semi-submersible rig, an even keel and four inclined conditions were considered. The uncertainty levels between verifiers’ results were within 10%. Slightly larger scatter was observed in inclined conditions but did not show any larger than 10% uncertainty level. It was possible to reduce the discrepancy by easing the setting difference from the wind tunnel test by introducing gap around deckbox and columns. For the FPSO, the results were within 3% for forces and within 14% for moments. After considering model test setup including the gap between FPSO hull bottom and turntable, the results were improved and within 10% error between the results and wind tunnel test except for 120 and 240 headings.
Abstract
Mean wind load on a semi-submersible rig and an FPSO was investigated by using Computational Fluid Dynamics (CFD) for the modeling practice developed in Reproducible Offshore CFD JIP. The modeling practice is benchmarked against available model test results for a semi-submersible rig and an FPSO in blind manner between verifiers. For the semi-submersible rig, an even keel and four inclined conditions were considered. The uncertainty levels between verifiers’ results were within 10%. Slightly larger scatter was observed in inclined conditions but did not show any larger than 10% uncertainty level. It was possible to reduce the discrepancy by easing the setting difference from the wind tunnel test by introducing gap around deckbox and columns. For the FPSO, the results were within 3% for forces and within 14% for moments. After considering model test setup including the gap between FPSO hull bottom and turntable, the results were improved and within 10% error between the results and wind tunnel test except for 120 and 240 headings.
참고문헌 (15)
- Achenbach, E., "Distribution of local pressure and skin friction around a circular cylinder in cross-flow", J. Fluid Mech, 106(34), pp.625~639 (1968)
- Andersen, O. J., "The Frøya database and maritime boundary layer wind description", Mar. Struct, pp.173~192 (2006)
- Recommended Practice for Planning, Designing and Constructing Fixed Offshore PlatformseWorking Stress Design, "API", American Petroleum Institute, ~ (2000)
- Kim, J., "Developing industry guidelines for the CFDbased evaluation of wind load on offshore floating facilities", Offshore Technology Conference (2019)
- Kim, J., "Numerical modeling of neutrally-stable and sustainable atmospheric boundary layer for the wind load estimation on an offshore platform", ASME 2018 37th International Conference on Ocean. Offshore & Arctic Engineering (2018)
- Koop, A., "Predicting wind loads on typical offshore vessels using CFD", ASME 31th International Conference on Ocean. Offshore and Arctic Engineering, pp.731~742 (2012)
- Prediction of Wind and Current Loads on VLCCs, "OCIMF", Oil Companies International Marine Forum London, ~ (1994)
- Richards, P., "Appropriate boundary conditions for computational wind engineering models using the k-e turbulence model", J. Wind Eng. Ind. Aerod, 46, pp.145~153 (1993)
- Richards, P. J., "Appropriate boundary conditions for computational wind engineering models revisited", J. Wind Eng. Ind. Aerod, pp.257~266 (2011)
- Roshko, A., "Experiments on the flow past a circular cylinder at very high Reynolds number", J. Fluid Mech, 10, pp.345~356 (1961)
- Sumner, J., "kE simulations of the neutral ABL: achieving horizontal homogeneity on practical grids", 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition (2010)
- Weller, H. G., "A tensorial approach to computational continuum mechanics using object-oriented techniques", Comput. Phys, 12, pp.620~631 (1998)
- Xing, T., "Factors of safety for richardson extrapolation", J. Fluid Eng, pp.132~ (2010)
- Xu, W., "Thorough verification and validation of CFD prediction of FPSO wind load for confident applications", ASME 2019 38th International Conference on Ocean. Offshore and Arctic Engineering (2019)
- Yeon, S., "Numerical modeling practice and verification of the wind load estimation for FPSO and semi-submersible", ASME 2019 38th International Conference on Ocean. Offshore and Arctic Engineering (2019)