Numerical Simulation on Flow around Analogous Square Cylinders at
Low Reynolds Number
DU Xiaoqing1,2,LIU Yantai1,SHI Dingjun1,MA Wenyong3
(1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;
2. Wind Engineering and Aerodynamic Flow Control Research Center, Shanghai University, Shanghai 200444, China;
3. Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China)
Abstract:In order to improve the aerodynamic performance of the standard square cylinder with sharp corners and straight edges, taking analogous square cylinder modified by the shape of angle (sharp angle, fillet) and edge (straight edge, concave edge and convex edge) as research objects, the aerodynamic performance and flow field characteristics of six kinds of two-dimensional cylinders with different wind direction angles were studied under low Reynolds number by using unsteady numerical simulation method. Research results show that the modification of the angle and edge shape of the standard square cylinder can obviously change the flow field structure and improve or degrade its aerodynamic performance. Compared with the straight edge cylinder, the aerodynamic coefficient and the wind pressure coefficient of the convex edge cylinder decrease obviously, while those of the concave edge cylinder intend to increase. Compared with the sharp corner cylinder, the aerodynamic coefficient of the rounded cylinder shows a trend to decrease in all wind direction angles, and the Strouhal number increases. On the whole, among the six types of cylinder studied, the aerodynamic performance of the convex edge cylinder with rounded corners is the best, and that of the concave edge cylinder with sharp corners is the worst.
[1] 余先锋, 谢壮宁, 刘慕广,等. 超高层建筑顺风向加速度的干扰效应研究[J]. 工程力学, 2017, 34(12):143-149.
YU Xianfeng, XIE Zhuangning, LIU Muguang,et al. Interference effects on along-wind acceleration between two high-rise buildings [J]. Engineering Mechanics, 2017, 34(12):143-149.
[2] 唐浩俊, 李永乐, 胡朋. 串列双塔柱风荷载及涡振性能研究[J]. 工程力学, 2013, 30(1):378-383.
TANG Haojun, LI Yongle, HU Peng. Wind loads and vortex-induced vibration of two tower columns in tandem arrangement[J].Engineering Mechanics, 2013, 30(1):378- 383.
[3] MOONEGHI M A, KARGARMOAKHAR R. Aerodynamic mitigation and shape optimization of buildings: Review [J]. Journal of Building Engineering, 2016, 6:225-235.
[4] ALAGHMANDAN M, ELNIMEIRI M. Reducing impact of wind on tall buildings through design and aerodynamic modifications (Architectural and structural concepts to mitigate wind effect on tall buildings)[C]∥ Architectural Engineering Conference, 2013:847-856.
[5] SHARMA A, MITTAL H, GAIROLA A. Mitigation of wind load on tall buildings through aerodynamic modifications: Review [J]. Journal of Building Engineering, 2018,18:180-194.
[6] 赵昕, 林祯杉, 孙华华. 超高层建筑形态空气动力学优化方法应用综述[J]. 结构工程师, 2011, 27(3):133-139.
ZHAO Xin, LIN Zhenshan, SUN Huahua. Aerodynamic modification methods for high-rise buildings[J].Structural Engineers, 2011, 27(3):133-139.
[7] 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[J]. 同济大学学报(自然科学版), 2013, 41(3):317-323.
GU Ming, ZHANG Zhengwei, QUAN Yong. Aerodynamic measures for mitigation of across-wind responses of super tall buildings: State of the art[J]. Journal of Tongji University (Natural Science), 2013, 41(3):317-323.
[8] TAMURA T, MIYAGI T, KITAGISHI T. Numerical prediction of unsteady pressures on a square cylinder with various corner shapes[J]. Journal of Wind Engineering and Industrial Aerodynamics,1998, 74-76:531-542.
[9] TAMURA T, MIYAGI T. The effect of turbulence on aerodynamic forces on a square cylinder with various corner shapes[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1999, 83(1-3):135-145.
[10] CAO Y, TAMURA T. Supercritical flows past a square cylinder with rounded corners[J]. Physics of Fluids, 2017, 29:085110.
[11] CAO Y, TAMURA T. Shear effects on flows past a square cylinder with rounded corners at Re=2.2×104[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2018, 174:119-132.
[12] TAMURA Y, KIM Y C, TANAKA H, et al. Aerodynamic and Tamura response characteristics of supertall buildings with various configurations[C]∥ Eighth Asia- Pacific Conference on Wind Engineering, 2013:K-219-K-243.
[13] KWOK K C S, WILHELM P A, WILKIE B G. Effect of edge configuration on wind-induced response of tall buildings[J]. Engineering Structures, 1988, 10(2):135- 140.
[14] KAWAI H. Effect of corner modifications on aeroelastic instabilities of tall buildings[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1998, 74-76:719-729.
[15] HU J C, ZHOU Y, DALTON C. Effects of the corner radius on the near wake of a square prism[J]. Experiments in Fluids, 2006, 40:106-118.
[16] ELSHAER A, BITSUAMLAK G, DAMATTY A E. Aerodynamic shape optimization for corners of tall buildings using CFD[C]∥ 14th International Conference on Wind Engineering, Porto Alegre,2015.
[17] LI Y,TIAN X,TEE K F, et al. Aerodynamic treatments for reduction of wind loads on high-rise buildings[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2018, 172:107-115.
[18] DEY P, DAS A K R. A numerical study on effect of corner radius and Reynolds number on fluid flow over a square cylinder[J]. Sādhanā, 2017,42:1155-1165.
[19] ELSHAER A, BITSUAMLAK G, DAMATTY A E. Enhancing wind performance of tall buildings using corner aerodynamic optimization[J]. Engineering Structures, 2017, 136:133-148.
[20] HINSBERG N P V, SCHEWE G, JACOBS M. Experiments on the aerodynamic behaviour of square cylinders with rounded corners at Reynolds numbers up to 12 million[ J]. Journal of Fluids and Structures, 2017, 74:214-233.
[21] DELANY N K, SORENSEN N E. Low-Speed Drag of Cylinders of Various Shapes[R]. Washington, D.C.: National National Advisory Commitee for Aeronautics, 1953.
[22] CARASSALE L, FREDA A, MARR-BRUNENGHI M. Effects of free-stream turbulence and corner shape on the galloping instability of square cylinders[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2013, 123(Part B):274-280.
[23] CARASSALE L, FREDA A, MARR-BRUNENGHI M. Experimental investigation on the aerodynamic behavior of square cylinders with rounded corners[J]. Journal of Fluids and Structures, 2014, 44:195-204.
[24] ZHANG W, SAMTANEY R. Low-Re flow past an isolated cylinder with rounded corners[J]. Computers & Fluids, 2016, 136:384-401.
[25] TAMURA T, OHTA I, KUWAHARA K. On the reliability of two-dimensional simulation for unsteady flows around a cylinder-type structure[J].Journal of Wind Engineering and Industrial Aerodynamics, 1990, 35:275-298.
[26] SOHANKAR A, NORBERG C, DAVIDSON L. Low-Reynolds-number flow around a square cylinder at incidence: Study of blockage, onset of vortex shedding and outlet boundary condition[J]. International Journal for Numerical Methods in Fluids, 2015, 26(1):39-56.
[27] SHARMA A, ESWARAN V. Heat and fluid flow across a square cylinder in the two-dimensional laminar flow regime[J]. Numerical Heat Transfer, Part A: Applications, 2004, 45(3):247-269.
[28] DE A K, DALAL A. Numerical simulation of unconfined flow past a triangular cylinder[J]. International Journal for Numerical Methods in Fluids, 2006, 52 (7):801-821.
[29] YOON D H, YANG K S, CHOI C B. Flow past a square cylinder with an angle of incidence[J]. Physics of Fluids, 2010, 22:043603.