Authors

Efficiency of quadratic turbulence models application for separated flows simulation in technological aggregates

UDC 532.526.5:519.53

Efficiency of quadratic turbulence models application for separated flows simulation in technological aggregates

Israphilov I.K., Boldyrev S. V., Boldyrev A. V., Kharchuk S.I.

Abstract
The numerical simulation of quasi-steady two-dimensional separated turbulent flow of incompressible gas in channel behind rearward-facing step in two-dimensional array is carried out. High-Reynolds number and Low-Reynolds number quadratic k-ε turbulence models are applied. Simulation results and experimental data fit properly. For both variants of calculation almost identical velocity and kinetic turbulent energy profiles in cross-sections of channel, pressure distribution along upper and lower walls, length of recirculation zone have been attained. However, for Low-Reynolds number model significant overestimation of skin-friction coefficient is observed, time and computational resource requirements being also increased. Thus for separated flows calculations in technological unite High-Reynolds number quadratic k-ε turbulence model is to be recommended.

Keywords: numerical simulation, rearward-facing step, turbulent flow, separated flow, turbulence model.

All references

1. Khovalyg D., Baranenko A.V. Methods for calculating the pressure gradient of a two-phase flow through small-diameter conduits. Vestnik Mezhdunarodnoyakademii kholoda. 2012. No 1. p. 3-10. (in Russian)

2. Pelenko V.V. et al.. Features of a current of thin films of liquid in the conditions of slip on a streamline surface. Protsessy i apparaty pishchevykh proizvodstv.2012. No 2. (in Russian)

3. Pelenko V.V., Voronenko S.V., Polyakov B.A. To a question of the description of hydromechanical process of sedimentation of solid particles in the liquid environment. Nauchnyy zhurnal NIU ITMO. Seriya «Protsessy i apparaty pishchevykh proizvodstv». 2013. No 2. (in Russian)

4. Alexeev G.V., Grischanova (Danilenko) E.A., Kondratov A.V.,Goncharov M.V.

Possibilities of implementing the effects of cavitation for shredding food raw materials. Vestnik Mezhdunarodnoy akademii kholoda. 2012. No 3. p. 45-47. (in Russian)

5. Alekseev G.V., Lunev K.N. Current of liquid in channels of the dispenser in the course of extrusion and research of accuracy of filling of tare. Izvestiya SPbGUNiPT. 2009. No 2. p. 51-54. (in Russian)

6. Alekseev G.V. et al. Mathematical methods in food engineering. Manual. – St. Petersburg. 2012. 176 p. (in Russian)

7. Driver D.M., Seegmiller H.L. Features of a reattaching turbulent shear layer in divergent channel flow. AIAA Journal. 1985. Vol. 23. No. 2. P. 163-171.

8. Kozlov A.P. Characteristics of a vector of surface friction in the sinuous tear-off and joining flows / A.P. Kozlov, N.I. Mikheev, V.M. Molochnikov, A.K. Saykin.Izvestiya Rossiyskoy akademii nauk. Energetika. 1998. № 4. p. 3-31. (in Russian)

9. Thangam, S. Turbulent flow past a backward-facing step: a critical evaluation of two-equation models / S. Thangam, C.G. Speziale. AIAA Journal. 1992. Vol.30. No.5. P. 1314-1320.

10. Šarić, S. A periodically perturbed backward-facing step flow by means of LES, DES and T-RANS: An example of flow separation control / S. Šarić,S. Jakirlić, C. Tropea. Journal of Fluids Engineering, Transactions of the ASME.2005. Vol.127. No.5. P. 879-887.

11. Chun, K.B. Control of turbulent separated flow over a backward-facing step by local forcing / K.B. Chun, H.J. Sung. Experiments in Fluids. 1996. Vol.21. No.6. P. 417-426.

12. Yoshioka, S. Organized vortex motion in periodically perturbed turbulent separated flow over a backward-facing step / S. Yoshioka, S. Obi, S. Masuda.International Journal of Heat and Fluid Flow. 2001. Vol.22. No.3. P. 301-307.

13. Belov I.A., Isaev S.A. Simulation of sinuous flows: Manual. – St. Petersburg. 2001. 108 p. (in Russian)

14. Lien F.S., Chen W.L., Leschziner M.A. Low-Reynolds number eddy-viscosity modeling based on non-linear stress-strain/vorticity relations, Proc. 3rd Symp. On Engineering Turbulence Modelling and Measurements, 27-29 May 1996, Crete, Greece.

15. Molochnikov V.M., Mikheev N.I., Dushina O.A. Research of applicability of a packet of Fluent to simulation of subsonic tear-off currents Teplofizika i aeromekhanika. 2009. T. 16. No 3. p. 387-394. (in Russian)

16. Yoder D.A., Georgiadis N.J. Implementation and validation of the Chien k-epsilon turbulence model in the WIND Navier-Stokes Code. AIAA Paper 99-0745. Jan. 1999.

Read the full article