NUMERICAL ANALYSIS OF A REATTACHED FLOW BEHIND A RIB
https://doi.org/10.29235/1561-8323-2018-62-1-109-114
Abstract
Turbulent characteristics of a reattached flow separated from a rib in an air flat channel were numerically analyzed by RANS and LES methods. The both methods showed low pressure regions in corners formed by the rib and the channel walls that caused a vorticity tube to be formed along the rib. Nevertheless in RANS, a reattached flow was identified as two-dimensional with a velocity decreasing near the channel bottom wall. In LES, the low pressure regions caused transverse and normal motions in the separation region that resulted in redistributions between velocity components, Reynolds stresses and the velocity decrease near the channel bottom wall, i.e., the formation of three-dimensional reattached flow.
Supporting agencies: The study was made within the framework of Grants Т16Р-005 (BFFR) and 16-58-00018 (RFFR).
About the Authors
Tatiana A. Baranova
Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Researcher
15, P. Brovka Str., Minsk
Valery L. Zhdanov
Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
D. Sc. (Engineering), Leading researcher
15, P. Brovka Str., Minsk
Dmitrii A. Ivanov
Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus
Belarus
Belarus
Ph. D. (Physics and Mathematics), Senior researcher
15, P. Brovka Str., Minsk
Yaroslav I. Smulskii
Kutateladze S. S. Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Leading specialist
2, Lavrentiev Ave., 630090, Novosibirsk
Viktor I. Terekhov
Kutateladze S. S. Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
D. Sc. (Engineering), Professor, Head of the Department
2, Lavrentiev Ave., 630090, Novosibirsk
References
1. Terekhov V. I., Smuls’kii Ya. I., Sharov K. А. Experimental study of the separated flow structure behind a backwardfacing step and a passive disturbance. Journal of Applied Mechanics and Technical Physics, 2016, vol. 57, no. 1, pp. 180–187. doi.org/10.1134/s002189441601020x
2. Isomoto K., Honami S. The effect of inlet turbulence intensity on the reattachment process over a backward-facing step. Journal of Fluids Engineering, 1989, vol. 111, no. 1, pp. 87–92. doi.org/10.1115/1.3243604
3. Park H., Jeon W., Choi H., Yoo J. Y. Mixing enhancement behind a backward-facing step using tabs. Physics of Fluids, 2007, vol. 19, no. 10, pp. 105103. doi.org/10.1063/1.2781597
4. Miau J., Chou J. H., Lee K. C., Chen M. H. Control of separated flow by a two-dimensional oscillating fence. AIAA Journal, 1991, vol. 29, no. 7, pp. 1140–1148. doi.org/10.2514/3.10715
5. Chun K. B., Sung H. J. Control of turbulent separated flow over a backward-facing step by local forcing. Experiments in Fluids, 1996, vol. 21, no. 6, pp. 417–426. doi.org/10.1007/bf00189044
6. Yoshioka S., Obi S., Masuda S. Organized vortex motion in periodically perturbed turbulent separated flow over a backward-facing step. International Journal of Heat and Fluid Flow, 2001, vol. 22, pp. 301–307. doi.org/10.1016/s0142- 727x(01)00092-3
7. Gong Y., Tanner F. X., Comparison of RANS and LES Models in the laminar limit for a flow over a backward-facing step using OpenFOAM. 19th Int. Multidimensional Engine Modeling Meeting SAE Congress. Detroit, Michigan, USA, 2009. Available at: http://www.erc.wisc.edu/documents/10-MTU_Gong-Tanner.pdf
8. Pope S. B. Turbulent Flows. Cambridge, Cambridge University Press, 2000. 773 p. doi.org/10.1017/cbo9780511840531
9. Schumann U. Subgrid scale model for finite difference simulations of turbulent flows in plane channels and annuli. Journal of Computational Physics, 1975, vol. 18, pp. 376–404. doi.org/10.1016/0021-9991(75)90093-5
10. Terekhov V. I., Bogatko T. V., Djachenko A. Ju., Smulskii Ya. I., Yarygina N. I. Heat transfer in subsonic separated flows. Novosibirsk, Novosibirsk State Technical University, 2016. 272 p. (in Russian).
Review
Views: 762
Email this article 