Larger-Eddy Simulation of Velocity Fluctuation in a Mixing T-Junction

Abstract:

Velocity fluctuations in a mixing T-junction were simulated in FLUENT using large-eddy simulation (LES) turbulent flow model with sub-grid scale (SGS) Smagorinsky–Lilly (SL) model. The normalized mean and root mean square velocities are used to describe the time-averaged velocities and the velocities fluctuation intensities. Comparison of the numerical results with experimental data shows that the LES model is valid for predicting the flow of mixing in a T-junction junction. The numerical results reveal the velocity distributions and fluctuations are basically symmetrical and the fluctuation at the upstream of the downstream of the main duct is stronger than that at the downstream of the downstream of the main duct.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 1313-1318
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.1313
• Online since: January 2012
• Authors: Tao Lu, Su Mei Liu, Ping Wang, Wei Yyu Zhu
• Keywords: Large Eddy Simulation (LES), Mixing, Numerical Simulation, T-Junction

References

[1] A. K. Kuczaj, E. M. J. Komen and M. S. Loginov, Large-Eddy Simulation study of turbulent mixing in a T-junction. Nuclear Engineering and Design, 240(9): 2116-2122 (2010).

DOI: 10.1016/j.nucengdes.2009.11.027

[2] P. Majander, T. Siikonen, Large-eddy simulation of a round jet in a cross-flow. International Journal of Heat and Fluid Flow, 27(3): 402-415 (2006).

DOI: 10.1016/j.ijheatfluidflow.2006.01.004

[3] J. P. Simoneau, J. Champigny, O. Gelineau, Applications of large eddy simulations in nuclear field. Nuclear Engineering and Design, 240(2): 429-439 (2010).

DOI: 10.1016/j.nucengdes.2008.08.018

[4] J. I. Lee, L. W. Hu, P. Saha, M. S. Kazimi, Numerical analysis of thermal striping induced high cycle thermal fatigue in a mixing tee. Nuclear Engineering and Design, 239(5): 833-839 (2009).

DOI: 10.1016/j.nucengdes.2008.06.014

[5] L. W. Hu, M. S. Kazimi, LES benchmark study of high cycle temperature fluctuations caused by thermal striping in a mixing tee. International Journal of Heat and Fluid Flow, 27(1): 54-64 (2006).

DOI: 10.1016/j.ijheatfluidflow.2005.08.001

[6] W. Y. Zhu, T. Lu, P. X. Jiang, Z. J. Guo, K. S. Wang, Large eddy simulation of hot and cold fluids mixing in a T-junction for predicting thermal fluctuations. Applied Mathematics and Mechanics, 30(11): 1379-1392 (2009).

DOI: 10.1007/s10483-009-1104-7

[7] S. M. Hosseini, K. Yuki, H. Hashizume, Classifaction of turbulent jets in a T-junction area with 90-deg bend upstream. International Journal of Heat and Mass Transfer, 51: 2444-2454 (2008).

DOI: 10.1016/j.ijheatmasstransfer.2007.08.024

[8] H. Ogawa, M. Igarashi, N. Kimura, H. Kamide. Experiment study on fluid mixing phenomena in T-pipe junction with upstream elbow. NURETH-11, Avignon, France, (2005).

DOI: 10.1016/j.nucengdes.2010.05.019

[9] N. Fukushima, K. Fukagata, N. Kasagi. Numerical and experimental study on turbulent thermal mxing in a t-junction flow. The 6th ASME-JSME Thermal Engineering Joint Conference, Hawaii, USA, (2003).

[10] T. Lu, P. X. Jiang, Z. J. Guo, Y. W. Zhang, H. Li, Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium. International Journal of Heat and Mass Transfer, 53(21-22): 4458-4466 (2010).

DOI: 10.1016/j.ijheatmasstransfer.2010.07.001