等边布置三方柱绕流漩涡相互作用机制的数值分析
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摘要
采用有限体积法,对雷诺数Re为100和200的左"品"字形布置等边三方柱的绕流问题进行了数值模拟,分析了间距比在1.2~6.0范围内,流场流动特性、柱体阻力系数、升力系数及斯特劳哈尔数的变化规律,重点研究了临界间距比,并成功捕捉到了上述两个雷诺数下三方柱绕流的临界间距比.结果表明:间距比对流场特性与结构具有非常重要的影响.Re为100时,偏流现象消失的临界间距比为3.7;Re为200时,偏流现象消失的临界间距比为4.1;Re为200时的流场比100时的更不稳定;随着雷诺数的增加,偏流现象消失的临界间距比增大.
A flow around three equispaced square cylinders arranged in equilateral left-triangular is numerically investigated at Reynolds number of 100 and 200 based on a finite-volume method. The spacing ratio g is set ranging from 1.2 to 6.0, and the flow is supposed to be laminar. The numerical results show that the spacing ratio has a significant effect on the flow pattern. Especially the critical spacing ratio, as a key parameter to affect the flow pattern and dynamic characteristics of the flow field, is examined in detail. When the Reynolds number is 100, the critical spacing ratio of bias flow disappears is 3.7;When the Reynolds number is 200, the critical spacing ratio of bias flow disappears is 4.1. The flow field at Re = 200 is less stable than the case of Re = 100. The critical spacing ratio increases with the increase of Reynolds number.
A flow around three equispaced square cylinders arranged in equilateral left-triangular is numerically investigated at Reynolds number of 100 and 200 based on a finite-volume method. The spacing ratio g is set ranging from 1.2 to 6.0, and the flow is supposed to be laminar. The numerical results show that the spacing ratio has a significant effect on the flow pattern. Especially the critical spacing ratio, as a key parameter to affect the flow pattern and dynamic characteristics of the flow field, is examined in detail. When the Reynolds number is 100, the critical spacing ratio of bias flow disappears is 3.7;When the Reynolds number is 200, the critical spacing ratio of bias flow disappears is 4.1. The flow field at Re = 200 is less stable than the case of Re = 100. The critical spacing ratio increases with the increase of Reynolds number.
引文
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[2]张伟,戴玉满.低雷诺数下等边布置三方柱绕流的数值研究[J].机械工程学报,2015(12):185-191.
[3]OKAJIMA A.Strouhal numbers of rectangular cylinders[J].Journal of Fluid Mechanics,1982,123(123):379-398.
[4]赵心广.三方柱绕流的大涡模拟及频谱分析[J].水科学与工程技术,2011(4):28-30.
[5]郭明旻,黄东群,林晨,等.三方柱表面风压脉动的时域特性[J].力学季刊,2001,22(4):439-446.
[6]张爱社,张陵.等边布置三圆柱绕流的数值分析[J].应用力学学报,2003,20(1):31-36.
[7]王掩刚,陈俊旭,先松川.基于POD方法的二维方柱低雷诺数绕流流场分析研究[J].西北工业大学学报,2014(4):612-617.
[8]DAVIS R W,MOORE E F,PURTELL L P.A numericalexperimental study of confined flow around rectangular cylinders[J].Physics of Fluids,1984,27(1):46-59.
[9]SOHANKAR A,DAVIDSON L,NORBERG C.Numerical simulation of unsteady flow around a square two-dimensional cylinder[C]//The University of Sydney.Australasian Fluid Mechanics Conference.Sydney:The University of Sydney,1995:517-520.
[10]ISLAM S U,ZHOU C Y.Numerical simulation of flow around a row of circular cylinders using the lattice Boltzmann method[J].Information Technology Journal,2009,8(4):513-520.
[11]SAHA A K,BISWAS G,MURALIDHAR K.Three-dimensional study of flow past a square cylinder at low Reynolds numbers[J].International Journal of Heat&Fluid Flow,2003,24(1):54-66.
[12]WAN D C,PATNAIK B S V,WEI G W.Discrete singular convolution-finite subdomain method for the solution of incompressible viscous flows[J].Journal of Computational Physics,2002,180(1):229-255.
[13]沈立龙,刘明维,吕启兵,等.双排并列三方柱绕流数值模拟[J].科学技术与工程,2014,14(23):135-139.