Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Numerical Simulation of Turbulent Separated and Reattaching Flows by Local Forcing

국소교란에 의한 난류박리 재부착 유동의 수치해석

  • 리광훈 (한국과학기술원 기계공학과) ;
  • 성형진 (한국과학기술원 기계공학과)
  • Published : 2000.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

An unsteady numerical simulation was performed for locally-forced separated and reattaching flow over a backward-facing step. The local forcing was given to the separated and reattaching flow by means of a sinusoidally oscillating jet from a separation line. A version of the $k-{\varepsilon}-f_{\mu}$ model was employed, in which the near-wall behavior without reference to distance and the nonequilibrium effect in the recirculation region were incorporated. The Reynolds number based on the step height (H) was fixed at $Re_H=33000$, and the forcing frequency was varied in the range $0{\leq}St_H{\leq}2$. The predicted results were compared and validated with the experimental data of Chun and Sung. It was shown that the unsteady locally-forced separated and reattaching flows are predicted reasonably well with the $k-{\varepsilon}-f_{\mu}$ model. To characterize the large-scale vortex evolution due to the local forcing, numerical flow visualizations were carried out.

Keywords

References

  1. Park, T.S. and Sung, R.J., 1997, 'A New Low-Reynolds-Number ${\kappa}-{\varepsilon}-f_{\mu}$ Model for Predictions Involving Multiple Surface,' Fluid Dynamics Research, Vol. 20, pp. 97-113 https://doi.org/10.1016/S0169-5983(96)00047-0
  2. Goldberg, U. and Palaniswamy, 1999, 'The ${\kappa}-{\varepsilon}-f_{\mu}$ Turbulence Closure Model,' Comput. Methods Appl. Meeh. Engrg., Vol. 179, pp. 139-149 https://doi.org/10.1016/S0045-7825(99)00035-3
  3. Durbin, P.A., Mansor, N.N. and Yang, Z., 1994, 'Eddy Viscosity Transport Model for Turbulent Flow,' Phys. Fluids, Vol. 6, No.2, pp. 1007-1015 https://doi.org/10.1063/1.868334
  4. 리광훈, 성형진, 2000, '난류 박리 및 재부착 유동에 대한 저레이놀즈수 비선형 열전달 모형의 개발,' 대한기계학회논문집, 제24권, 제2호
  5. Chun, K. B. and Sung, H. ., 1996, 'Control of Turbulent Separated Flow over a Backward- facing Step by Local Forcing,' Exp. Fluids, Vol. 21, pp. 417-426 https://doi.org/10.1007/BF00189044
  6. Roos, F. W. and Kegelman, J. T., 1986, 'Control of Coherent Structures in Reattaching Laminar and Turbulent Shear Layers,' AIAA J, Vol. 24, pp. 1956-1963
  7. Kiya, M., Shimizu, M., Mochizuki, O., Ido, Y. and Tezuka, H., 1993, 'Active Forcing of an Axisymmetric Leading-edge Turbulent Separation Bubble,' AIAA paper 93-3245
  8. Sigurdson, L. W., 1995, 'The Structure and Control of a Turbulent Reattaching Flow,' J. Fluid Mech., Vol. 298, pp. 139-165 https://doi.org/10.1017/S0022112095003259
  9. Chun, K. B. and Sung, H. J., 1998, 'Visualization of a Locally-forced Separated Flow over a Backward-facing Step,' Exp. Fluids, Vol. 25, pp. 133-142 https://doi.org/10.1007/s003480050217
  10. Hadzic, I. and Hanjalic, K., 1993, 'On the Evalution of Turbulence Field in a Periodic Flow in a Finite Length Pipe,' 9th Symp. on Turbuelent Shear Flows, Kyoto, Japan, pp. 21-13-18
  11. Reynier, P. and Minh, H. H., 1998, 'Numerical Prediction of Unsteady Compressible Turbulent Coaxial Jets,' Computers and Fluids, Vol. 27, pp. 239-254 https://doi.org/10.1016/S0045-7930(97)00023-6
  12. Neel, R. E., Walters, R. W. and Simpson, R. L., 1998, 'Computations of Steady and Unsteady Low-speed Turbulent Separated Flows,' AIAA J., Vol. 36, pp. 1208-1215
  13. Lee, M. J., Kim, J. and Moin, P., 1990, 'Structure of Turbulence at High Shear Rate,' J. Fluid Mech., Vol. 216, pp. 561-583 https://doi.org/10.1017/S0022112090000532
  14. Durbin, P. A. and Laurence, D., 1996, 'Nonlocal Effects in Single Point Closure,' 3rd Advances in Turbuelence Research Coference, Korea Univ., Korea, pp. 109-120
  15. Vogel, J. C. and Eaton, J. K., 1985, 'Combined Heat Transfer and Fluid Dynamic Measurements Downstream of a Backward-facing Step,' ASME J. Heat Transfer, Vol. 107, pp. 922-929
  16. Nagib, H. M., Reisenthel P. H. and Koga, D. J., 1985, 'On the Dynamical Scaling of Forced Unsteady Separated Flows,' AIAA Shear Flow Control Conference, AIAA-85-0553
  17. Gai, S. L. and Sharma, S. D., 1987, 'Pressure Distribution Behind a Rearward Facing Step,' Exp. Fluids, Vol. 14, 154-158 https://doi.org/10.1007/BF00298455
  18. Bhattacharjee, S., Scheelke, B. and Troutt, T. R., 1986, 'Modifications of Vortex Interactions in a Reattaching Separated Flow,' AIAA J., Vol. 24, pp. 623-629
  19. Bradshaw, P. and Wong F. Y. F., 1972, 'The Reattachment and Relaxation of a Turbulent Shear Layer,' J. Fluid Mech., Vol. 52, pp. 113-135 https://doi.org/10.1017/S002211207200299X