Research on the Effects of Numerical Simulation Parameters of Separation Vortex Flow Field

doi:10.3901/JME.2016.12.165

Abstract

Abstract: Separation vortex flow field widely exists in the industrial field. Numerical simulation and experimental study of separation vortex complement each other. Numerical simulation equations include a number of parameters. Some of them have a great impact on the simulation results. Based on 2D backward facing step flow field, pipe backward facing step flow field and pipe wedge flow field, using particle image velocimetry(PIV) and numerical simulation, the effects of parameters variation are obtained. Numerical simulation of separation vortex is carried out by shear stress transport(SST) k-ω model. The effect of the variation of SST k-ω model parameter a₁ on three kinds of flow field numerical simulation results with separation vortex is obtained by theoretical derivation. It shows that the recirculation zone length increases with the increase of a₁. Theoretical derivation result is verified by numerical simulation. By comparing the effects of variation of model parameters on the simulation results, it shows that the characteristics of 2D backward facing step flow field and the pipe backward facing step flow field is similar with pipe wedge flow field. According to the results of PIV, the setting of model parameter a₁ is optimized.

Key words: model, model parameter, particle image velocimetry, pipe wedge flow field, SST k-ω

CLC Number:

O357

HU Yue, ZHANG Tao. Research on the Effects of Numerical Simulation Parameters of Separation Vortex Flow Field[J]. Journal of Mechanical Engineering, 2016, 52(12): 165-172.

References

[1] 黄明海,齐鄂荣,李炜. PIV在二维后向台阶流实验研究中的应用[J]. 武汉大学学报,2005,38(2)：35-38.
HUANG Minghai,QI Erong,LI Wei. Study on 2D flow over a backward facing step flow with particle image velocimetry[J]. Journal of Wuhan University,2005,38(2)：35-38.
[2] KOSTAS J,SORIA J,CHONG M S. Particle image velocimetry measurements of a backward-facing step flow[J]. Experiments in Fluids,2002,33：838-853.
[3] PIIRTO M,SAARENRINNE P,ELORANTA H,et al. Measuring turbulence energy with PIV in a backward-facing step flow[J]. Experiments in Fluids,2003,35：219-236.
[4] GRANT I,OWENS E,YAN Y Y. Particle image velocimetry measurements of the separated flow behind a rearward facing step[J]. Experiments in Fluids,1992,12：238-244.
[5] HEIST D K,GOULDIN F C. Turbulent flow normal to a triangular cylinder[J]. Journal of Fluid Mechanics,1997,331：107-125.
[6] 郑丹丹,张朋勇,徐天室. 超声流量计探头安装位置对测量影响数值仿真研究[J]. 机械工程学报,2011,47(12)：13-18.
ZHENG Dandan,ZHANG Pengyong,XU Tianshi. Effect of installation position of ultrasonic flowmeter probe on flow measurement[J]. Journal of Mechanical Engineering,2011,47(12)：13-18.
[7] HALL S D. A detailed CFD and experimental investigation of a benchmark turbulent backward facing step flow[EB/OL]. [2003-09-08]. http：//cfd4aircraft. com/int_conf/IC1/abstracts/hall_nsw.pdf.
[8] HAQUE A,AHMAD F,YAMADA S. Assessment of turbulence models for turbulent flow over backward facing step[C]//Proceedings of the World Congress on Engineering,2007：1340-1345.
[9] 钱炜祺,蔡金狮. 不可压湍流流动k-ε两方程模型参数辨识[J]. 水动力学研究与进展,2000,15(4)：450-454.
QIAN Weiqi,CAI Jinshi. Parameter identification of two-equation k-ε model for incompressible turbulent flow[J]. Journal of Hydrodynamics,2000,15(4)：450-454.
[10] 周宇,钱炜祺,邓有奇,等. k-ω SST两方程湍流模型中参数影响的初步分析[J]. 空气动力学学报,2010,28(2)：213-217.
ZHOU Yu,QIAN Weiqi,DENG Youqi,et al. Introductory analysis of the influence of Menter’s k-ω SST turbulence model’s parameters[J]. Acta Aerodynamica Sinica,2010,28(2)：213-217.
[11] WILCOX D C. Turbulence modeling for CFD[M]. La Canada,CA：DCW Industries,1998.
[12] DRIVER D M. Reynolds shear stress measurements in a separated boundary layer flow[R]. AIAA ,91-1787,1991.
[13] RUCK B,MAKIOLA B. Flow separation over the inclined step[J]. Vieweg Teubner Verlag,1993,40：47-55.
[14] 方开泰,马长兴. 正交与均匀试验设计[M]. 北京：科学出版社,2001.
FANG Kaitai,MA Changxing. Orthogonal and uniform experimental design[M]. Beijing：Science Press,2001.
[15] 胡岳,姚世勇,张涛,等. 圆管内楔形节流件周围流场的TRPIV实验测量[J]. 天津大学学报,2015(4)：285-290.
HU Yue,YAO Shiyong,ZHANG Tao,et al. TRPIV measurement of flow field around wedge in circular pipe[J]. Journal of Tianjin University,2015(4)：285-290.