Numerical Analysis of Wind Pressure Characteristics Around Two Combinatorial Hemispheres
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- 英文论文题名：Numerical Analysis of Wind Pressure Characteristics Around Two Combinatorial Hemispheres
- 论文作者：YANG Linjia ; ZHU Pengfei
- 英文论文作者：YANG Linjia ; ZHU Pengfei ; Dalian Maritime University
- 年：2015
- 作者机构：Dalian Maritime University;
- 英文论文关键词：wind pressure characteristics ; combinatorial hemisphere ; CFD ; LES
- 会议召开时间：2015-09-01
- 会议录名称：中国航海科技优秀论文集（2014）
- 语种：英文
- 分类号：U661.3
- 学会代码：PJJY
- 学会名称：上海浦江教育出版社有限公司
- 页数：16
- 文件大小：1690k
- 原文格式：O
摘要
A numerical analysis of wind pressure characteristics around two combinatorial hemispheres is presented in this paper.The superstructure of Liquefied Natural Gas(LNG) carrier is composed of multiple combinatorial hemisphere tanks.The wind pressure characteristics of LNG carrier must be complicated due to the combinatorial hemisphere tanks.We focus on the force and pressure characteristics around two combinatorial hemispheric tanks.The size of combinatorial hemisphere model is as the same as the real tank of LNG carrier.The velocity of wind is18.256 m/s and the flow simulations are at high Reynolds number(Re=6×10~7).In this study,the numerical analysis is made on the models that are rotated with step of20° until reproducing the full incidence of 180°.Large Eddy Simulation(LES) is employed to run the simulation using the Smagorinsky-Lilly model.Groups of airflow around two combinatorial hemispheres are simulated.The equations are solved on a structured mesh using a finite volume method.The flow field and total drag forces are computed for various wind directions.We obtain wind drag coefficient map of the two combinatorial hemispheres of varying wind attack angles and establish the regression curve equations.The mean characteristics of force and pressure field around combinatorial hemisphere surface are described and discussed.Three different kinds of flow patterns around two combinatorial hemispheres are identified.The results show that wind direction characteristically influences the flow and pressure field around combinatorial hemispheres in wind loads on the structure.Flow pattern transformation occurs around 20° and 60°.LES can give satisfactory predictions for wind load on the LNG carrier tanks.The recommended numerical simulation method may provide an effective way to research the maneuverability of LNG carrier in wind.
A numerical analysis of wind pressure characteristics around two combinatorial hemispheres is presented in this paper.The superstructure of Liquefied Natural Gas(LNG) carrier is composed of multiple combinatorial hemisphere tanks.The wind pressure characteristics of LNG carrier must be complicated due to the combinatorial hemisphere tanks.We focus on the force and pressure characteristics around two combinatorial hemispheric tanks.The size of combinatorial hemisphere model is as the same as the real tank of LNG carrier.The velocity of wind is18.256 m/s and the flow simulations are at high Reynolds number(Re=6×10~7).In this study,the numerical analysis is made on the models that are rotated with step of20° until reproducing the full incidence of 180°.Large Eddy Simulation(LES) is employed to run the simulation using the Smagorinsky-Lilly model.Groups of airflow around two combinatorial hemispheres are simulated.The equations are solved on a structured mesh using a finite volume method.The flow field and total drag forces are computed for various wind directions.We obtain wind drag coefficient map of the two combinatorial hemispheres of varying wind attack angles and establish the regression curve equations.The mean characteristics of force and pressure field around combinatorial hemisphere surface are described and discussed.Three different kinds of flow patterns around two combinatorial hemispheres are identified.The results show that wind direction characteristically influences the flow and pressure field around combinatorial hemispheres in wind loads on the structure.Flow pattern transformation occurs around 20° and 60°.LES can give satisfactory predictions for wind load on the LNG carrier tanks.The recommended numerical simulation method may provide an effective way to research the maneuverability of LNG carrier in wind.
A numerical analysis of wind pressure characteristics around two combinatorial hemispheres is presented in this paper.The superstructure of Liquefied Natural Gas(LNG) carrier is composed of multiple combinatorial hemisphere tanks.The wind pressure characteristics of LNG carrier must be complicated due to the combinatorial hemisphere tanks.We focus on the force and pressure characteristics around two combinatorial hemispheric tanks.The size of combinatorial hemisphere model is as the same as the real tank of LNG carrier.The velocity of wind is18.256 m/s and the flow simulations are at high Reynolds number(Re=6×10~7).In this study,the numerical analysis is made on the models that are rotated with step of20° until reproducing the full incidence of 180°.Large Eddy Simulation(LES) is employed to run the simulation using the Smagorinsky-Lilly model.Groups of airflow around two combinatorial hemispheres are simulated.The equations are solved on a structured mesh using a finite volume method.The flow field and total drag forces are computed for various wind directions.We obtain wind drag coefficient map of the two combinatorial hemispheres of varying wind attack angles and establish the regression curve equations.The mean characteristics of force and pressure field around combinatorial hemisphere surface are described and discussed.Three different kinds of flow patterns around two combinatorial hemispheres are identified.The results show that wind direction characteristically influences the flow and pressure field around combinatorial hemispheres in wind loads on the structure.Flow pattern transformation occurs around 20° and 60°.LES can give satisfactory predictions for wind load on the LNG carrier tanks.The recommended numerical simulation method may provide an effective way to research the maneuverability of LNG carrier in wind.
引文
[1]Isherwood R.M.Wind resistance of merchant ships[J].J.RINA Supplementary,1973:115.
[2]Blendermann W.Wind loads on moored and manoeuvring vessels[J].Proceedings 12th International Conference on Offshore Mechanics and Arctic Engineering,1993:183-188.
[3]Blendermann W.Parameter identification of wind loads on ships[J].Journal of Wind Engineering and Industrial Aerodynamics,1994(51):339.
[4]Blendermann W.Estimation of wind loads on ships in wind with a strong gradient[J].Proceedings of the 14th International Conference on Offshore Mechanics and Arctic Engineering,1995:271-278.
[5]Gould R W.The estimation of wind loads on ship superstructures,No.RINA-MTM-8.34.1982.
[6]Savory E,Toy N.Hemisphere and hemisphere-cylinders in turbulent boundary layers[J].Journal of Wind Engineering and Industrial Aerodynamics,1986(23):345-354.
[7]Cheng C.M.,Fu C.L.Characteristic of wind loads on a hemispherical dome in smooth flow and turbulent boundary layer flow[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(6):328-336.
[8]Manhart M,Wengle H.Large-eddy simulation of turbulent boundary layer flow over a hemisphere,Direct and Large-Eddy Simulation I,1994.
[9]Meroney R.N,Letchford C.W.,Sarkar P.P.Comparison of numerical and wind tunnel simulation of wind loads on smooth,rough and dual domes immersed in a boundary layer[J].Wind and Structures,2002,5(2):347-358.
[10]Breuer M,Bernsdorf J.Accurate computations of the laminar flow past a square cylinder based on two different methods:lattice-Boltzmann and finite-volume[J].International Journal of Heat and Fluid Flow,2000,21(2):186-198.
[11]Lam K,Li J.Y.Flow pattern and velocity field distribution of cross-flow around four cylinders in a square configuration at a low Reynolds number[J].Journal of Fluids and Structures,2003,17(5):665-672.
[12]Popinet S,Smith M,Stevens C.Experimental and numerical study of the turbulence characteristics of air flow around a research vessel[J].Journal of Atmospheric and Oceanic Technology,2004:1575-1589.
[13]Brizzolara S,Rizzuto E.Wind Heeling Moments on Very Large Ships,Some Insights through CFD Results,In proceedings of the 9th International Conference of Ships and Ocean Vehicles.
[14]Wnk.A.,Pao.A,Zhou X.,et al.Numerical and experimental analysis of the wind forces acting on LNG carrier.In Proceedings of the V European Conference on Computational Fluid Dynamics(CFD 2010).ECCOMAS.
[15]Catalano P,Wang M,laccarino G.Numerical simulation of the flow around a circular cylinder at high Reynolds numbers[J].International Journal of Heat and Fluid Flow,2003,24(4):463-469.
[16]Shyy W,Thakur S,Wrigh J.Second-order upwind and central difference schemes for recalculating flow computation[J].AIAA,1992,30(4):923-931.
[17]Ni.MJ,Tao.W.Q,Wang S.J.Stability-controllable second-order difference scheme for convection term[J].Journal of Thermal Science,1998,7(2):119-130.
[18]Tezduyar T E.,Shih.R.Numerical experiments on downstream boundary of flow past cylinder[J].Journal of engineering mechanics,1991,117(4):854-871.
[19]Murakami S.Overview of turbulence models applied in CWE-1997[J].Journal of Wind Engineering and Industrial Aerodynamics,1998(74):1-24.
[2]Blendermann W.Wind loads on moored and manoeuvring vessels[J].Proceedings 12th International Conference on Offshore Mechanics and Arctic Engineering,1993:183-188.
[3]Blendermann W.Parameter identification of wind loads on ships[J].Journal of Wind Engineering and Industrial Aerodynamics,1994(51):339.
[4]Blendermann W.Estimation of wind loads on ships in wind with a strong gradient[J].Proceedings of the 14th International Conference on Offshore Mechanics and Arctic Engineering,1995:271-278.
[5]Gould R W.The estimation of wind loads on ship superstructures,No.RINA-MTM-8.34.1982.
[6]Savory E,Toy N.Hemisphere and hemisphere-cylinders in turbulent boundary layers[J].Journal of Wind Engineering and Industrial Aerodynamics,1986(23):345-354.
[7]Cheng C.M.,Fu C.L.Characteristic of wind loads on a hemispherical dome in smooth flow and turbulent boundary layer flow[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(6):328-336.
[8]Manhart M,Wengle H.Large-eddy simulation of turbulent boundary layer flow over a hemisphere,Direct and Large-Eddy Simulation I,1994.
[9]Meroney R.N,Letchford C.W.,Sarkar P.P.Comparison of numerical and wind tunnel simulation of wind loads on smooth,rough and dual domes immersed in a boundary layer[J].Wind and Structures,2002,5(2):347-358.
[10]Breuer M,Bernsdorf J.Accurate computations of the laminar flow past a square cylinder based on two different methods:lattice-Boltzmann and finite-volume[J].International Journal of Heat and Fluid Flow,2000,21(2):186-198.
[11]Lam K,Li J.Y.Flow pattern and velocity field distribution of cross-flow around four cylinders in a square configuration at a low Reynolds number[J].Journal of Fluids and Structures,2003,17(5):665-672.
[12]Popinet S,Smith M,Stevens C.Experimental and numerical study of the turbulence characteristics of air flow around a research vessel[J].Journal of Atmospheric and Oceanic Technology,2004:1575-1589.
[13]Brizzolara S,Rizzuto E.Wind Heeling Moments on Very Large Ships,Some Insights through CFD Results,In proceedings of the 9th International Conference of Ships and Ocean Vehicles.
[14]Wnk.A.,Pao.A,Zhou X.,et al.Numerical and experimental analysis of the wind forces acting on LNG carrier.In Proceedings of the V European Conference on Computational Fluid Dynamics(CFD 2010).ECCOMAS.
[15]Catalano P,Wang M,laccarino G.Numerical simulation of the flow around a circular cylinder at high Reynolds numbers[J].International Journal of Heat and Fluid Flow,2003,24(4):463-469.
[16]Shyy W,Thakur S,Wrigh J.Second-order upwind and central difference schemes for recalculating flow computation[J].AIAA,1992,30(4):923-931.
[17]Ni.MJ,Tao.W.Q,Wang S.J.Stability-controllable second-order difference scheme for convection term[J].Journal of Thermal Science,1998,7(2):119-130.
[18]Tezduyar T E.,Shih.R.Numerical experiments on downstream boundary of flow past cylinder[J].Journal of engineering mechanics,1991,117(4):854-871.
[19]Murakami S.Overview of turbulence models applied in CWE-1997[J].Journal of Wind Engineering and Industrial Aerodynamics,1998(74):1-24.