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Effects of Synthetic Jet in Suppressing Cavity Oscillations

Authors: S. Sarkar, R. Mandal


The three-dimensional incompressible flow past a rectangular open cavity is investigated, where the aspect ratio of the cavity is considered as 4. The principle objective is to use large-eddy simulation to resolve and control the large-scale structures, which are largely responsible for flow oscillations in a cavity. The flow past an open cavity is very common in aerospace applications and can be a cause of acoustic source due to hydrodynamic instability of the shear layer and its interactions with the downstream edge. The unsteady Navier-stokes equations have been solved on a staggered mesh using a symmetry-preserving central difference scheme. Synthetic jet has been used as an active control to suppress the cavity oscillations in wake mode for a Reynolds number of ReD = 3360. The effect of synthetic jet has been studied by varying the jet amplitude and frequency, which is placed at the upstream wall of the cavity. The study indicates that there exits a frequency band, which is larger than a critical value, is effective in attenuating cavity oscillations when blowing ratio is more than 1.0.

Keywords: Turbulence, Flow control, large eddy simulation, Cavity oscillation, Synthetic Jet

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[1] G. Ashcroft and X. Zhang, "Vortical Structures over Rectangular Cavities at Low speed," Physics of Fluids, vol.17, No.1, pp. 015104-1ÔÇö 015104-8, 2005.
[2] V. Sarohia, "Experimental investigation of oscillations in flows over shallow cavities," AIAA Journal, vol.15, pp. 984-991, 1977.
[3] D. Rockwell and E. Naudascher, "ReviewÔÇöSelf-sustaining oscillations of flow past cavities," ASME Journal of Fluids Engineering, vol.100, pp. 152-165, 1978.
[4] D. Rockwell and C. Knisely, "Observation of the three-dimensional nature of unstable flow past a cavity," Physics of Fluids, vol.23, pp. 425-431, 1980.
[5] J. C. F. Pereira and J. M. M. Sousa, "Influence of impingement edge geometry on cavity flow oscillations," AIAA Journal, vol.32, pp. 1737- 1740, 1994.
[6] J. C. F. Pereira and J. M. M. Sousa, "Experimental and numerical investigation of flow oscillations in a rectangular cavity," ASME Journal of Fluids Engineering, vol.117, pp. 68-73, 1995.
[7] C. W. Rowley, T. Colonius and A. J. Basu, "On self-sustained oscillations in two-dimensional compressible flow over rectangular cavities," Journal of Fluid Mechanics, vol.455, pp. 315-346, 2002.
[8] A. Hamed, D. Basu, D. Mohamed and K. Das, "Direct Numerical Simulations of High Speed Flow over Cavity," Proceedings (TAICDL), August 5-9, 2001.
[9] T. Colonius, A. J. Basu and C. W. Rowley, "Numerical Investigation of the Flow Past a Cavity," AIAA Paper, 99-1912, 10-12 May, 1999.
[10] K. Chang, G. Constantinescu and S. O. Park, "Analysis of the flow and mass transfer processes for the incompressible flow past an open cavity with a laminar and a fully turbulent incoming boundary layer," Journal of Fluid Mechanics, vol.561, pp. 113-145, 2006.
[11] D. P. Rizzetta and M. R. Visbal, "Large Eddy Simulation of Supersonic Cavity Flow fields Including Flow Control," AIAA Paper, 2002-2853, 24-26 June, 2002.
[12] S. Arunajatesan, J. D. Shipman and N. Sinha, "Hybrid RANS-LES Simulation of Cavity Flow Fields with Control," AIAA Paper, 2002- 1130, 14-17 January, 2002.
[13] D. Basu, A. Hamed and K. Das, "DES and Hybrid RANS/LES models for unsteady separated turbulent flow predictions," AIAA Paper, 2005- 0503, 10-13 January, 2005.
[14] M. E. Franke and R. Sarno, "Suppression of Flow Induced Pressure Oscillations in Cavities," AIAA Paper, 90-4018, October 1990.
[15] S. McGrath and L. Shaw, "Active Control of Shallow Cavity Acoustic Resonance," AIAA Paper, 96-1949, 17-20 June, 1996.
[16] M. J. Stanek, J. A. Ross, J. Odedra and J. Peto, "High Frequency Acoustic Suppression-The Mystery of the Rod-in-Crossflow Revealed," AIAA Paper, 2003-0007, 6-9 January, 2003.
[17] A. D. Vakili and C. Gauthier, "Control of Cavity Flow by Upstream Mass-Injection," Journal of Aircraft, vol.31, No.1, pp. 169-174, 1994.
[18] V. Suponitsky, E. Avital and M. Gaster, "On three-dimensionality and control of incompressible cavity flow," Physics of Fluids, vol.17, pp. 104103-1ÔÇö104103-19, 2005.
[19] M. J. Stanek, M. R. Visbal, D. P. Rizzetta, S. G. Rubin and P. K. Khosla, "On a mechanism of stabilizing turbulent free shear layers in cavity flows," Computers & Fluids, vol.36, pp. 1621-1637, 2007.
[20] A. Kourta and E. Vitale, "Analysis and control of cavity flow," Physics of Fluids, vol.20, pp. 077104-1--077104-10, 2008.
[21] K. Das, A. Hamed and D. Basu, "Numerical Investigations Of Transonic Cavity Flow Control Using Steady And Pulsed Fluidic Injection," Proceedings of FEDSM 2005-77422, ASME FEDSM, 19-23 June, 2005.
[22] M. Germano, U. Piomelli, P. Moin and W. H. Cabot, "A dynamic subgrid-scale eddy viscosity model," Physics of Fluids A, vol.3, pp. 1760-1765, 1991.
[23] D. K. Lilly, "A proposed modification of the Germano subgrid-scale closure method," Physics of Fluids A, vol.4, pp. 633-635, 1992.
[24] S. Sarkar and P. R. Voke, "Large-eddy simulation of unsteady surface pressure on a LP turbine blade due to interactions of passing wakes and inflexional boundary layer," ASME Journal of Turbomachinery, vol.128, pp. 221-231, 2006.
[25] S. Sarkar, "Identification of flow structures on a LP turbine blade due to periodic passing wakes," ASME Journal of Fluids Engineering, vol.130, pp. 061103-1--061103-10, 2008.
[26] S. Sarkar and Sudipto Sarkar, "Large-Eddy Simulation of Wake and Boundary Layer Interactions behind a Circular Cylinder," ASME Journal of Fluids Engineering, vol.131, pp. 091201-1ÔÇö091201-13, 2009.
[27] P. Moin and J. Kim, "On the numerical solution of time dependent viscous incompressible fluid flows involving solid boundaries," Journal of Computational Physics, vol.35, pp. 381-392, 1980.
[28] M. Gharib and A. Roshko, "The effect of flow oscillations on cavity drag," Journal of Fluid Mechanics, vol.177, pp. 501-530, 1987.
[29] D. Rockwell and C. Knisely, "Vortex-edge interaction: Mechanism for generating low frequency components," Physics of Fluids, vol.23, No.2, pp. 239-240, 1979.
[30] H. Schlichting, "Boundary Layer Theory", 7th Edition, McGraw-Hill Book Co, New York (1979).
[31] D. Rockwell, "Prediction of oscillation frequencies for unstable flow past cavities", Journal of Fluids Engineering, Vol. 99, pp 294-300, 1977.
[32] M. Kiya and K. Sasaki, "Structure of large-scale vortices and unsteady reverse flow in the reattaching zone of a turbulent separation bubble", Journal of Fluid Mechanics, Vol. 154, pp. 463-491, 1985.
[33] Y. Na and P. Moin, "Direct Numerical Simulation of a separated turbulent boundary layer", Journal of Fluid Mechanics, Vol. 374, pp. 379-405, 1998.