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بررسی تاثیر پایه بر میدان جریان باد اطراف دو ساختمان هم ردیف | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 2، دوره 51، شماره 2، خرداد و تیر 1398، صفحه 249-260 اصل مقاله (4.97 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2017.12784.5437 | ||
| نویسندگان | ||
| حمید رضا حقیقی فرد؛ محمد مهدی توکل* | ||
| گروه مهندسی مکانیک، واحد شیراز دانشگاه آزاد اسلامی، شیراز، ایران | ||
| چکیده | ||
| در تحقیق حاضر میدان جریان متلاطم باد اطراف دو ساختمان هم ردیف بدون پایه و بر روی پایه در فواصل مختلف به روش عددی بررسی شده است. به منظور مدل سازی آشفتگی از دو مدل آشفته( k-ɛ)دسته نرمالسازی مجدد و k-ɛتحقق پذیر استفاده شده است. براساس شبیه سازیهای عددی صورت گرفته، توزیع سرعت طولی اطراف ساختمانهای منفرد بدون پایه و بر روی پایه با نتایج آزمایشگاهی مقایسه شده اند. سپس با استفاده از مدل اعتبار سنجی شده، برای شبیه سازی میدان جریان اطراف ساختمانهای هم ردیف بدون پایه و بر روی پایه از مدل k-ɛتحقق پذیر استفاده شده و سرعت طولی برای دو عدد رینولدز 17000 و 170000 ارائه شده اند. به صورت تقریبی میدان سرعت اطراف مدل ساختمان های بدون پایه در دو عدد رینولدز مشابه میباشند، اگر چه برای ساختمان های بر روی پایه تفاوت اندکی در توزیع سرعت به ویژه در بخش زیرین و روی ساختمانها مشاهده میشود. مقایسه نتایج نشان میدهد که قرار دادن ساختمان بر روی پایه به دلیل حذف جریان برگشتی در پشت ساختمان منجر به کاهش نیروی پسای وارده به ساختمان میگردد. همچنین وجود پایه ها سبب میشود که طول اتصال مجدد روی ساختمان بالادست افزایش یابد. | ||
| کلیدواژهها | ||
| ساختمانهای هم ردیف؛ ساختمان بر روی پایه؛ طول جدایش؛ جریان برگشتی | ||
| عنوان مقاله [English] | ||
| Effect of Support on Wind Flow Field Around Array of Two Inline Buildings | ||
| نویسندگان [English] | ||
| H. Haghighifard؛ M. Tavakol | ||
| Department of Mechanical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran | ||
| چکیده [English] | ||
| In the present study turbulent wind flow field around inline surface-mounted and supported buildings has been investigated numerically. In order to model turbulence, re-normalization group k‑ε and realizable k‑ε turbulence models are employed. According to the numerical simulations, stream-wise velocity profiles around single surface-mounted and supported buildings are compared with the experimental data. Consequently, the validated model with realizable k‑ε turbulence models is used to simulate flow field around two inline surface-mounted and supported buildings. Results have been reported for two Reynolds numbers (17000, 170000). Approximately, same velocity field was observed for non-supported buildings at two flow Reynolds numbers. Although, for supported buildings small difference is observed in the velocity profile under and above the building. Comparison of results for non-supported and supported buildings shows that behind the supported buildings the near ground reversed flow region was removed and lead to the lower drag force on such building. Moreover, supports increase the reattachment length on the upstream building. | ||
| کلیدواژهها [English] | ||
| Inline buildings, Supported building, Separation length, Reversed flow | ||
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| مراجع | ||
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[1] W. Schofield, E. Logan, Turbulent shear flow over surface mounted obstacles, Journal of fluids engineering, 112(4) (1990) 376-385. [2] I. Castro, Measurements in shear layers separating from surface-mounted bluff bodies, Journal of Wind Engineering and Industrial Aerodynamics, 7(3) (1981) 253-272. [3] D. Maull, R. Young, Vortex shedding from bluff bodies in a shear flow, Journal of Fluid Mechanics, 60(2) (1973) 401-409. [4] I. Castro, A. Robins, The flow around a surface-mounted cube in uniform and turbulent streams, Journal of fluid Mechanics, 79(2) (1977) 307-335. [5] Motalebi.S, Abouali.O, Goshtasbi. E, investigation of flow field around a building with subsurface flow,Seventeenth International Conference on Mechanical Engineering, (2009) (in Persian). [6] Y. Tominaga, Flow around a high-rise building using steady and unsteady RANS CFD: Effect of large-scale fluctuations on the velocity statistics, Journal of Wind Engineering and Industrial Aerodynamics, 142 (2015) 93-103. [7] Y. Tominaga, S.-i. Akabayashi, T. Kitahara, Y. Arinami, Air flow around isolated gable-roof buildings with different roof pitches: Wind tunnel experiments and CFD simulations, Building and Environment, 84 (2015) 204- 213. [8] F.-S. Lien, E. Yee, Numerical Modelling of the Turbulent Flow Developing Within and Over a 3-D Building Array, Part I: A High-Resolution Reynolds-Averaged Navier— Stokes Approach, Boundary-Layer Meteorology, 112(3) (2004) 427-466. [9] R.J. Martinuzzi, B. Havel, Turbulent flow around two interfering surface-mounted cubic obstacles in tandem arrangement, Journal of fluids engineering, 122(1) (2000) 24-31. [10] E. Tulapurkara, B. Gowda, J. Chaukar, Mean velocity field around prismatic bodies in tandem arrangement, Journal of wind engineering and industrial aerodynamics, 93(10) (2005) 777-796. [11] A. Mittal, D. Ghosh, S. Behera, I. Siddiqui, D. Dharmshaktu, Wind flow simulation in the vicinity of tall buildings through CFD, in: Eighth Asia-Pacific Conference on Wind Engineering, Chennai, India, 2013. [12] R. Gnatowska, Aerodynamic characteristics of threedimensional surface-mounted objects in tandem arrangement, International Journal of Turbo and Jet Engines, 28(1) (2011) 21-29. [13] Z. Liu, T. Ishihara, A study of tornado induced mean aerodynamic forces on a gable-roofed building by the large eddy simulations, Journal of Wind Engineering and Industrial Aerodynamics, 146 (2015) 39-50. [14] A.-M. Aly, J. Bresowar, Aerodynamic mitigation of wind-induced uplift forces on low-rise buildings: A comparative study, Journal of Building Engineering, 5 (2016) 267-276. [15] W. Kim, Y. Tamura, A. Yoshida, Interference effects on aerodynamic wind forces between two buildings, Journal of Wind Engineering and Industrial Aerodynamics, 147 (2015) 186-201. [16] E. Meinders, K. Hanjalić, Vortex structure and heat transfer in turbulent flow over a wall-mounted matrix of cubes, International Journal of Heat and fluid flow, 20(3) (1999) 255-267. [17] B. Ničeno, A. Dronkers, K. Hanjalić, Turbulent heat transfer from a multi-layered wall-mounted cube matrix: a large eddy simulation, International Journal of Heat and fluid flow, 23(2) (2002) 173-185. [18] V. Natarajan, M. Chyu, Effect of flow angle-of-attack on the local heat/mass transfer from a wall-mounted cube, Journal of heat transfer, 116(3) (1994) 552-560. [19] E. Meinders, K. Hanjalić, Experimental study of the convective heat transfer from in-line and staggered configurations of two wall-mounted cubes, International Journal of Heat and mass transfer, 45(3) (2002) 465-482. [20] Y. Tominaga, A. Mochida, R. Yoshie, H. Kataoka, T. Nozu, M. Yoshikawa, T. Shirasawa, AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings, Journal of wind engineering and industrial aerodynamics, 96(10-11) (2008) 1749-1761. [21] S.M. Hasankola, E.G. Rad, O. Abouali, Experimental investigation of the airflow around supported and surface mounted low rise rural buildings, Iranian Journal of Science and Technology. Transactions of Mechanical Engineering, 36(M2) (2012) 143. [22] B.E. Launder, D.B. Spalding, Mathematical models of turbulence, Academic press, 1972. [23] V. Yakhot, S. Orszag, S. Thangam, T. Gatski, C. Speziale, Development of turbulence models for shear flows by a double expansion technique, Physics of Fluids A: Fluid Dynamics, 4(7) (1992) 1510-1520. [24] T.-H. Shih, W.W. Liou, A. Shabbir, Z. Yang, J. Zhu, A new k-ϵ eddy viscosity model for high reynolds number turbulent flows, Computers & Fluids, 24(3) (1995) 227- 238. [25] H. Nakamura, T. Igarashi, T. Tsutsui, Fluid flow and local heat transfer around two cubes arranged in tandem on a flat plate turbulent boundary layer, JSME International Journal Series B Fluids and Thermal Engineering, 44(4) (2001) 584-591. | ||
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