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

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

DOI QR Code

Flow Control Around a Circular Cylinder Using Two Splitter Plates

두 개의 분할판을 이용한 원형 단면 실린더의 유동제어

  • Published : 2004.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

Control of drag force on a circular cylinder using multiple detached splitter plates is numerically studied for laminar flow Two splitter plates with the same length as the cylinder diameter (d) are placed horizontally in the upstream of the cylinder and in the near-wake region, respectively. Their positions are described by the gap ratios (G$_1$/d, G$_2$/d), where G$_1$ represents the gap between the cylinder stagnation point and the rear edge of the upstream splitter plate, and G$_2$ represents the gap between the cylinder base point and the leading edge of the rear splitter plate. The drag varies with the two gap ratios; it has the minimum value at a certain set of gap ratios for each Reynolds number The upstream splitter plate decreases the stagnation pressure, while the rear splitter plate increases the base pressure by suppressing vortex shedding. This combined effect causes a significant drag reduction on the cylinder Particularly, the drag sharply increases past an optimum G$_2$/d; this seems to be related to a sudden change in bubble size in the wake region.

Keywords

References

  1. Anderson, E. A. and Szewczyk, A. A., 1997, 'Effect of a Splitter on the Near Wake of a Circular Cylinder in 2 and 3-Dimensional Flow Configurations,' Experiments in Fluids, Vol. 23, pp. 161-174 https://doi.org/10.1007/s003480050098
  2. Rathakrishnan, E., 1999, 'Effect of Splitter Plate on Bluff Body Drag,' AIAA, Vol. 37, No. 9, pp. 1125-1126 https://doi.org/10.2514/2.823
  3. Unal, M. F. and Rockwell, D., 1987, 'On Vortex Formation from a Cylinder. Part 2. Control by Splitter-Plate Interference,' J. Fluid Mech., Vol. 190, pp. 513-529 https://doi.org/10.1017/S0022112088001430
  4. Apelt, C. J., West, G. S. and Szewczyk, A., 1973 'The Effect of Wake Splitter Plates on the Flow Past a Circular Cylinder in the Range $10^4,' J. Fluid Mech., Vol. 61, pp. 187-198 https://doi.org/10.1017/S0022112073000649
  5. Kwon, K. and Choi, H., 1995, 'Control of Laminar Vortex Shedding Behind a Circular Cylinder Using Splitter Plates,' Phys. of Fluids, Vol. 8, pp. 479-486 https://doi.org/10.1063/1.868801
  6. Ozono, S., 1999, 'Flow Control of Vortex Shedding by a Short Splitter Plate Asymmetrically Arranged Downstream of a Cylinder,' Phys. of Fluids, Vol. 11, pp. 2928-2934 https://doi.org/10.1063/1.870151
  7. Hwang, J. Y., Yang, K. S. and Sun, S. H., 2003, 'Reduction of Flow-Induced Forces on a Circular Cylinder Using a Detached Splitter Plate,' Phys. of Fluids, in print https://doi.org/10.1063/1.1583733
  8. Pauley, L. L., Moin, P. and Reynolds, W. C., 1988, 'A Numerical Study of Unsteady Laminar Boundary Layer Separation,' Report No. TF-34, Thermo-sciences Division, Department of Mechanical Engineering, Stanford University
  9. Kim, J. and Moin, P., 1985, 'Application of a Fractional Step Method to Incompressible Navier-Stokes Equations,' Journal of Computational Physics, Vol. 59, pp. 308-323 https://doi.org/10.1016/0021-9991(85)90148-2
  10. Rosenfeld, M., Kwak, D. and Vinokur, M., 1991, 'A Fractional Step method for the Unsteady Incompressible Navier-Stokes Equations in Generalized Coordinate Systems,' J. Comp. Physics., Vol. 94, pp. 102-137 https://doi.org/10.1016/0021-9991(91)90139-C
  11. Park, J., Kwon, K. and Choi, H., 1998, 'Numerical Solutions of Flow Past a Circular Cylinder at Reynolds Numbers up to 160, 'KSME International J. Vol. 12, pp. 1200-1205 https://doi.org/10.1007/BF02942594
  12. Schlichting, 1979, 'Boundary Layer Theory,' McGraw-Hill Book Company