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Du Xiaoqing, Tian Xinxin, Ma Wenyong, Li Erdong. EFFECTS OF ROUNDED CORNER ON AERODYNAMICS OF SQUARE CYLINDERS AND ITS FLOW MECHANISMS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1013-1023. DOI: 10.6052/0459-1879-18-123
Citation: Du Xiaoqing, Tian Xinxin, Ma Wenyong, Li Erdong. EFFECTS OF ROUNDED CORNER ON AERODYNAMICS OF SQUARE CYLINDERS AND ITS FLOW MECHANISMS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1013-1023. DOI: 10.6052/0459-1879-18-123
shu

EFFECTS OF ROUNDED CORNER ON AERODYNAMICS OF SQUARE CYLINDERS AND ITS FLOW MECHANISMS

  • *(Department of Civil Engineering, Shanghai University, Shanghai 200444, China)

  • †(Wind Engineering and Aerodynamic Flow Control Research Center, Shanghai University, Shanghai 200444, China)

  • **(Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, China)

  • Received Date: June 04, 2018
    Graphical Abstract
    • Abstract
  • Corner rounding modification is commonly used to improve the aerodynamics of a square cylinder. However, its flow mechanism has not been clarified yet. Aerodynamic performances and flow field characteristics of sharp and rounded-corner square cylinders have been investigated using large eddy simulation (LES) in a uniform flow at the Reynolds number of 2.2×104. The effect of attack angle has been evaluated, and characteristics of the shear layer and the separation bubble have been quantitatively analyzed. The physical mechanism behind the corner modification is discussed as well. Results show that the overall surface pressures, aerodynamic forces and vortex shedding intensity of rounded-corner square cylinders have a downward trend in comparison to sharp-corner cylinders. The "separation bubble'' flow pattern occurs in a lower attack angle for rounded-corner cylinders. As the increase of the attack angle, the length of the separation bubble decreases until it disappears. Besides, the separation point of rounded-corner cylinders moves downstream, which leads to a thinner shear layer and a narrower wake and a weaker vortex shedding. All these factors result in a reduced drag coefficient and an increased Strouhal number of rounded-corner square cylinders.
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  • [1] Lyn DA, Einav S, Rodi W, et al.A laser-Doppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder. Journal of Fluid Mechanics, 1995,304: 285-319
    [2] Bearman PW, Obasaju ED.An experimental study of pressure fluctuations on fixed and oscillating square-section cylinders. Journal of Fluid Mechanics, 1982, 119: 297-321
    [3] Lee BE.The effect of turbulence on the surface pressure field of a square prism. Journal of Fluid Mechanics, 1975,69(2): 263-282
    [4] Luo SC, Yazdani MG, Chew YT, et al.Effects of incidence and afterbody shape on flow past bluff cylinders. Journal of Wind Engineering and Industrial Aerodynamics, 1994, 53(3): 375-399
    [5] 顾明, 张正维, 全涌.降低超高层建筑横风向响应气动措施研究进展. 同济大学学报:自然科学版, 2013 (3): 317-323
    [5] (Gu Ming, Zhang Zhengwei, Quan Yong.Aerodynamic measures for mitigation of across-wind responses of super tall buildings. Journal of Tongji University Nature Science, 2013 (3): 375-323 (in Chinese))
    [6] Tse KT, Hitchcock PA, Kwok KCS, et al.Economic perspectives of aerodynamic treatments of square tall buildings. Journal of Wind Engineering and Industrial Aerodynamics, 2009, 97(9-10):455-467.
    [7] 王新荣, 顾明. 角部处理的二维方柱风压分布特性的试验研究.土木工程学报, 2016, 49(7): 79-88
    [7] (Wang Xinrong, Gu Ming.Experimental study on wind pressure distributions of 2-D square prisms with various corner treatments. China Civil Engineering Journal, 2016, 49(7): 79-88 (in Chinese))
    [8] Norberg C.Flow around rectangular cylinders: pressure forces and wake frequencies. Journal of Wind Engineering and Industrial Aerodynamics, 1993, 49(1-3): 187-196
    [9] 王新荣, 顾明, 全涌. 圆角处理的断面宽厚比为2∼1的二维矩形柱体气动力系数的雷诺数效应研究. 工程力学, 2016, 33(1):64-71
    [9] (Wang Xinrong, Gu ming, Quan yong. Experimental study of Reynolds number effects on aerodynamic forces for 2: 1 rectangular prisms with various rounded corners. Engineering Mechanics,2016, 33(1): 64-71 (in Chinese))
    [10] Carassale L, Freda A, Marrˊe-Brunenghi M. Effects of free-stream turbulence and corner shape on the galloping instability of square cylinders. Journal of Wind Engineering and Industrial Aerodynamics, 2013, 123(Part B): 274-280
    [11] Chen JM, Liu CH.Vortex shedding and surface pressures on a square cylinder at incidence to a uniform air stream. International Journal of Heat and Fluid Flow, 1999, 20(6):592-597
    [12] Dutta S, Muralidhar K, Pnigrahi PK.Influence of the orientation of a square cylinder on the wake properties. Experiments in Fluids, 2003(34): 16-23
    [13] Huang RF, Lin BH, Yen SC.Time-averaged topological flow patterns and their influence on vortex shedding of a square cylinder in crossflow at incidence. Journal of Fluids and Structures, 2010, 26(3): 406-429
    [14] Yen SC, Yang CW.Flow patterns and vortex shedding behavior behind a square cylinder. Journal of Wind Engineering and Industrial Aerodynamics, 2011, 99(8): 868-878
    [15] Kawai H.Effect of corner modifications on aeroelastic instabilities of tall buildings. Journal of Wind Engineering and Industrial Aerodynamics, 1998, (74): 719-729
    [16] Hu JC, Zhou Y, Dalton C.Effects of the corner radius on the near wake of a square prism. Experiments in Fluids,2006, (40): 106-108
    [17] Carassale L, Freda A, Marrˊe-Brunenghi M. Experimental investigation on the aerodynamic behavior of square cylinders with rounded corners. Journal of Fluids and Structures, 2014, 44:195-204
    [18] Hinsberg NPV, Schewe G, Jacobs M.Experiments on the aerodynamic behaviour of square cylinders with rounded corners at Reynolds numbers up to 12 million. Journal of Fluids & Structures, 2017, 74(C): 214-233
    [19] Sohankar A, Davidson L, Norberg C.Large eddy simulation of flow past a square cylinder: Comparison of different subgrid scale models. Journal of Fluids Engineering, 2000, 122(1):39-47
    [20] Rodi W.Comparison of LES and RANS calculations of the flow around bluff bodies. Journal of Wind Engineering and Industrial Aerodynamics, 1997, 69: 55-75
    [21] Cao Y, Tamura T.Large-eddy simulations of flow past a square cylinder using structured and unstructured grids. Computers & Fluids, 2016, 137: 36-54
    [22] Nishimura H, Taniike Y.Fluctuating wind forces on a stationary two dimension square prism//16th National Symposium on Wind Engineering, 2000: 255-260
    [23] Tamura T, Ono Y.LES analysis on aeroelastic instability of prisms in turbulent flow. Journal of Wind Engineering and Industrial Aerodynamics, 2003, 91(12): 1827-1846
    [24] Oka S, Ishihara T.Numerical study of aerodynamic characteristics of a square prism in a uniform flow. Journal of Wind Engineering and Industrial Aerodynamics, 2009, 97(11):548-559
    [25] Tamura T, Ohta I, Kuwahara K.On the reliability of two-dimensional simulation for unsteady flows around a cylinder-type structure. Journal of Wind Engineering and Industrial Aerodynamics, 1990, 35: 275-298
    [26] Tamura T, Miyagi T, Kitagishi T.Numerical prediction of unsteady pressures on a square cylinder with various corner shapes. Journal of Wind Engineering and Industrial Aerodynamics, 1998, 74: 531-542
    [27] Tamura T, Miyagi T.The effect of turbulence on aerodynamic forces on a square cylinder with various corner shapes. Journal of Wind Engineering and Industrial Aerodynamics, 1999,83(6): 135-145
    [28] Cao Y, Tamura T.Supercritical flows past a square cylinder with rounded corners. Physics of Fluids, 2017, 29(8): 08511
    [29] Trias F X, Gorobets A, Oliva A.Turbulent flow around a square cylinder at Reynolds number 22,000: A DNS study. Computers & Fluids, 2015, 123: 87-98
    [30] Cao Y, Tamura T.Large-eddy simulations of flow past a square cylinder using structured and unstructured grids. Computers & Fluids, 2016, 137: 36-54
    [31] 吴霆, 时北极, 王士召等. 大涡模拟的壁模型及其应用. 力学学报,2018, 50(3): 453-466
    [31] (Wu Ting, Shi Beiji, Wang Shizhao, et al.Wall-model for large-eddy simulation and its applications. Jounal of Theoretical and Applied Mechanics, 2018, 50(3): 453-466(in Chinese)
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