한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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LARGE EDDY SIMULATION OF THE COMPRESSIBLE FLOW OVER A CAVITY WITH HIGH ASPECT RATIO

  • Oh Keon Je (Department of Mechanical Engineering, Kyungnam University)
  • 발행 : 2004.03.01
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초록

Large eddy simulation is used to investigate the compressible flow over a cavity with high aspect ratio. The sub-grid scale stresses are modeled using the dynamic model. The compressible Navier-Stokes equations are solved with the sixth order accurate compact finite difference scheme in the space and the 4th order Runge-Kutta scheme in the time. The buffer Bone techniques are used for non-reflecting boundary conditions. The results show the shear layer oscillation over the cavity. The votical disturbances, the roll-up of vorticity, and impingement and scattering of vorticity at the downstream cavity edge can be seen in the shear layer. Several peaks for the resonant frequencies are found in the spectra of the vertical velocity at the center-line. The most energetic Peak near the downstream edge is different from that at the center part of the cavity The pressure has its minimum value in the vortex core inside the cavity, and becomes very high at the downstream face of the cavity. The variation of the model coefficient predicted by the dynamic model is quite large between 0 and 0.3. The model coefficient increases in the stream-wise evolution of the shear layer and sharply decreases near the wall due to the wall effect.

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참고문헌

  1. Rossiter, J.E., 'Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds', Technical Report 3438, Aeronautical Research Council Reports and Memoranda.(1964)
  2. Colonius, T., Basu, A. J., and Rowley.,C.W., 'Numerical investigation of the flow pasta cavity', AIAA (1999), pp.99-1912
  3. Oh, K., and Colonius, T., 'Large eddy simulation of the compressible flow over an open cavity, Proceedings of the ASME Fluids engineering summer meeting, FEDSM 2002-31352, (2002)
  4. Oh, K, 'Large eddy simulation of the compressible flow over an open cavity, Journal of the KSPE, Korean Society of propulsion Engineers, Vo1.7, No.l, (2003), pp.40-48
  5. Weber, C., Development of the implicit method for Navier-Stokes simulations', Ph.D. Thesis, CERFACS. (1998), pp.26-30
  6. Wilcox, D.C., 'Turbulence modeling for CFD', DCW Industries, La Canada, California, (1993)
  7. Germano, M., Piomelli, U., Moin, P., and Cabot, W., 'A dynamic sub-grid scale eddy viscosity model', Phys. Fluids A, Vol.3,(1991), pp.1760-1765
  8. Moin, P., Squires, W., Cabot, W., and Lee, S., 'A dynamic sub-grid scale model for compressible turbulence and scalar transport', Phys. Fluids A, Vo1.3, (1991), pp.2746-2757
  9. Lilly, D.K... 'A proposed modification of the Germano sub-grid closure method', Phys. Fluids A, Vo1.4, (1992), pp.633-635
  10. Lele, S. K., Compact finite difference schemes with spectral-like resolution , J. Computational Phys., Vol. 103, (1992) pp. 16-42
  11. Boersma, B.J., and Lele, S.K., Large Eddy Simulation of a Mach 0.9 Turbulent Jet , AIAA Paper99-1874, (1999)
  12. Poinsot, T., and Lele, S.K., 'Boundary conditions for direct simulation of compressible viscous flows' J. Computational Phys. Vol. 101, (1992), pp. 104 -129
  13. FreundJ.B., Proposed inflow/outflow boundary conditions for direct computation of aerodynamic sound , AIAA J., Vo1.35, (1997), pp. 740-742
  14. Tam, C.K.W., and Block, P.J.W., 'On the tones and pressure oscillations induced by flow over rectangular cavites', J. Fluid Mech., Vo1.89, (1978), pp.373-399