基于重叠网格方法浮筒涡激运动特性数值分析
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摘要
浮筒被广泛应用在海洋工程中,研究浮筒的涡激运动对于减少其对海洋平台构件的疲劳损坏具有指导意义。传统的动网格方法在处理浮筒转动运动时会因网格变形过大导致计算不收敛,采用了重叠网格方法以解决这一问题。数值试验采用了基于开源工具包Open FOAM自主开发的naoe-FOAM-SJTU求解器。分别进行了自由衰减数值试验和涡激运动数值试验。研究表明,随着折合速度的增加,浮筒的顺流向、横流向、垂荡和艏摇运动频率增加,且顺流向与垂荡频率相近,横流向与艏摇频率相近;其次,根据涡量场分布,表明浮筒前一时刻的泻涡会影响到浮筒之后时刻的周向涡量分布;最后,研究发现自由端对于浮筒尾流场泻涡有着显著影响,为将来探究减少浮筒涡激运动的方法提供指导。
Buoyancy can is widely applied in ocean engineering. The investigation of the large-amplitude motion of the buoyancy can is instructive for reducing the fatigue damage of the offshore platform components. The conventional deforming mesh is not able to perform large amplitude rotation due to the excessive mesh distortion. In this paper,the overset grid method is used to solve this problem. The solver applied in the numerical experiments is the naoe-FOAM-SJTU solver based on the open source toolkit Open FOAM. In this study,the free decay tests and VIM tests at different inflow velocities are carried out. The results show that with the increase of the inflow velocity,the frequency of inline,crossflow,heave and yaw motions increase,and the inline and heave frequencies are similar,and crossflow and yaw frequencies are similar. Secondly,according to the vortex field distribution,it shows that the previous vortex affects the circumferential vortex field distribution during the motion cycle. Finally,it is found that the free end of the buoyancy can have a significant effect on the pressure distribution of flow field,which provides guidance for reducing the VIM of the buoyancy can.
Buoyancy can is widely applied in ocean engineering. The investigation of the large-amplitude motion of the buoyancy can is instructive for reducing the fatigue damage of the offshore platform components. The conventional deforming mesh is not able to perform large amplitude rotation due to the excessive mesh distortion. In this paper,the overset grid method is used to solve this problem. The solver applied in the numerical experiments is the naoe-FOAM-SJTU solver based on the open source toolkit Open FOAM. In this study,the free decay tests and VIM tests at different inflow velocities are carried out. The results show that with the increase of the inflow velocity,the frequency of inline,crossflow,heave and yaw motions increase,and the inline and heave frequencies are similar,and crossflow and yaw frequencies are similar. Secondly,according to the vortex field distribution,it shows that the previous vortex affects the circumferential vortex field distribution during the motion cycle. Finally,it is found that the free end of the buoyancy can have a significant effect on the pressure distribution of flow field,which provides guidance for reducing the VIM of the buoyancy can.
引文
[1] KARUNAKARAN D,DAN L,MAIR J. Qualification of the grouped SLOR riser system[C]∥Proceedings of the 2009 Offshore Technology Conference. 2009:4-7.
[2] GOVARDHAN R,WILLIAMSON C H K. Vortex-induced motions of a tethered sphere[J]. Journal of Wind Engineering and Industrial Aerodynamics,1997,69-71(97):375-385.
[3] WILDE J D. Model tests on the vortex induced motions of the air can of a free standing riser system in current[C]∥Proceedings of the Deep Offshore Technology Conference. 2007:1-10.
[4] KANG Z,NI W C,ZHANG X,et al. An experimental investigation of six-degrees-of-freedom VIM characteristics of a tethered buoyancy can[C]∥Proceedings of the Twenty-sixth International Ocean and Polar Engineering Conference. 2016.
[5] KANG Z,PING L. Model test investigation on vortex-induced motions of a buoyancy can[J]. Marine Structures,2017,53:86-104.
[6] KALLINDERIS Y,AHN H T. Strongly coupled fluid-structure interactions via a new Navier-Stokes method for prediction of vortex-induced vibrations[C]∥Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering.American Society of Mechanical Engineers,2005:927-934.
[7]赵伟文,万德成.用大涡模拟方法数值模拟Truss Spar平台涡激运动问题[C]∥第十三届全国水动力学学术会议暨第二十六届全国水动力学研讨会论文集. 2014.(ZHAO Weiwen,WAN Decheng. Numerical investigation of vortex-induced motions of Spar platform based on large eddy simulation[C]∥Proceeding of the 13th National Congress on Hydrodynamics&22th National Conference on Hydrodynamics. 2014.(in Chinese))
[8]刘正浩,赵伟文,万德成.用SST-DES方法数值模拟半潜式平台涡激运动[C]∥第九届全国流体力学学术会议论文集.2016.(LIU Zhenghao,ZHAO Weiwen,WAN Decheng. Numerical investigation of vortex-induced motions of semisubmersible platform based on SST-DES[C]∥Proceeding of the 9th National Conference on Fluid Mechanics. 2016.(in Chinese))
[9] ETIENNE S,FONTAINE E. Effect of the rotational degree of freedom on vortex-induced vibrations of a circular cylinder in cross-flow[C]∥Proceedings of the 20th International Offshore and Polar Engineering Conference.2010.
[10] MINGUEZ M,LUPPI A,BERGER A. Slender buoy FSHR vortex induced rotations[C]∥Proceedings of the ASME 31th International Conference on Ocean,Offshore and Arctic Engineering. 2012:713-722.
[11] MINGUEZ M,LUPPI A,PATTEDOIE S. Slender buoy VIM&VIR analysis by CFD/FSI approach[C]∥Proceedings of the ASME 30th International Conference on Ocean,Offshore and Arctic Engineering. 2011:1-9.
[12] ZHAO W W,WAN D C. Detached-eddy simulation of flow past tandem cylinders[J]. Applied Mathematics and Mechanics,2016,37(12):1272-1281.
[13] MENTER F R,KUNTZ M,LANGTRY R. Ten years of industrial experience with the sst turbulence model[C]∥Proceedings of the 4th International Symposium on Turbulence Heat and Mass Transfer. 2003:625-632.
[14] NOACK R,DAVID B,ROBERT K,et al. Suggar++:An improved general overset grid assembly capability[C]∥Proceeding of the 19th AIAA Computational Fluid Dynamics. 2009.
[15] SHEN Z R,WAN D C. RANS Computations of added resistance and motions of a ship in head waves[J]. International Journal of Offshore and Polar Engineering,2013,23(4):263-271.
[16] SHEN Z R,WAN D C,PABLO M C. Dynamic overset grids in Open FOAM with application to KCS self-propulsion and maneuvering[J]. Ocean Engineering,2015,108:287-306.
[17]李鹏.浮力筒自由涡激运动试验研究[D].哈尔滨:哈尔滨工程大学,2015.(LI Peng. Model test investigation on vortexinduced motions of a tethered buoyancy can[D]. Harbin:Harbin Engineering University,2015.(in Chinese))
[18] HUNT J C R,WRAY A A,MOIN P. Eddies,streams,and convergence zones in turbulent flows[R]. Center for Turbulence Research Report CTR-S88,Stanford University,USA,1988.
[2] GOVARDHAN R,WILLIAMSON C H K. Vortex-induced motions of a tethered sphere[J]. Journal of Wind Engineering and Industrial Aerodynamics,1997,69-71(97):375-385.
[3] WILDE J D. Model tests on the vortex induced motions of the air can of a free standing riser system in current[C]∥Proceedings of the Deep Offshore Technology Conference. 2007:1-10.
[4] KANG Z,NI W C,ZHANG X,et al. An experimental investigation of six-degrees-of-freedom VIM characteristics of a tethered buoyancy can[C]∥Proceedings of the Twenty-sixth International Ocean and Polar Engineering Conference. 2016.
[5] KANG Z,PING L. Model test investigation on vortex-induced motions of a buoyancy can[J]. Marine Structures,2017,53:86-104.
[6] KALLINDERIS Y,AHN H T. Strongly coupled fluid-structure interactions via a new Navier-Stokes method for prediction of vortex-induced vibrations[C]∥Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering.American Society of Mechanical Engineers,2005:927-934.
[7]赵伟文,万德成.用大涡模拟方法数值模拟Truss Spar平台涡激运动问题[C]∥第十三届全国水动力学学术会议暨第二十六届全国水动力学研讨会论文集. 2014.(ZHAO Weiwen,WAN Decheng. Numerical investigation of vortex-induced motions of Spar platform based on large eddy simulation[C]∥Proceeding of the 13th National Congress on Hydrodynamics&22th National Conference on Hydrodynamics. 2014.(in Chinese))
[8]刘正浩,赵伟文,万德成.用SST-DES方法数值模拟半潜式平台涡激运动[C]∥第九届全国流体力学学术会议论文集.2016.(LIU Zhenghao,ZHAO Weiwen,WAN Decheng. Numerical investigation of vortex-induced motions of semisubmersible platform based on SST-DES[C]∥Proceeding of the 9th National Conference on Fluid Mechanics. 2016.(in Chinese))
[9] ETIENNE S,FONTAINE E. Effect of the rotational degree of freedom on vortex-induced vibrations of a circular cylinder in cross-flow[C]∥Proceedings of the 20th International Offshore and Polar Engineering Conference.2010.
[10] MINGUEZ M,LUPPI A,BERGER A. Slender buoy FSHR vortex induced rotations[C]∥Proceedings of the ASME 31th International Conference on Ocean,Offshore and Arctic Engineering. 2012:713-722.
[11] MINGUEZ M,LUPPI A,PATTEDOIE S. Slender buoy VIM&VIR analysis by CFD/FSI approach[C]∥Proceedings of the ASME 30th International Conference on Ocean,Offshore and Arctic Engineering. 2011:1-9.
[12] ZHAO W W,WAN D C. Detached-eddy simulation of flow past tandem cylinders[J]. Applied Mathematics and Mechanics,2016,37(12):1272-1281.
[13] MENTER F R,KUNTZ M,LANGTRY R. Ten years of industrial experience with the sst turbulence model[C]∥Proceedings of the 4th International Symposium on Turbulence Heat and Mass Transfer. 2003:625-632.
[14] NOACK R,DAVID B,ROBERT K,et al. Suggar++:An improved general overset grid assembly capability[C]∥Proceeding of the 19th AIAA Computational Fluid Dynamics. 2009.
[15] SHEN Z R,WAN D C. RANS Computations of added resistance and motions of a ship in head waves[J]. International Journal of Offshore and Polar Engineering,2013,23(4):263-271.
[16] SHEN Z R,WAN D C,PABLO M C. Dynamic overset grids in Open FOAM with application to KCS self-propulsion and maneuvering[J]. Ocean Engineering,2015,108:287-306.
[17]李鹏.浮力筒自由涡激运动试验研究[D].哈尔滨:哈尔滨工程大学,2015.(LI Peng. Model test investigation on vortexinduced motions of a tethered buoyancy can[D]. Harbin:Harbin Engineering University,2015.(in Chinese))
[18] HUNT J C R,WRAY A A,MOIN P. Eddies,streams,and convergence zones in turbulent flows[R]. Center for Turbulence Research Report CTR-S88,Stanford University,USA,1988.
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