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

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

DOI QR Code

Drag Reduction on n Circular Cylinder using a Detached Splitter Plate

분리된 분할판에 의한 원형단면 실린더의 항력감소

  • Published : 2001.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Control of drag farce on a circular cylinder using a detached splitter plate is numerically studied for laminar flow. A splitter plate with the same length as the cylinder diameter(d) is placed horizontally in the wake region. Its position is described by the gap ratio(G/d), where G represents the gap between the cylinder base point and the leading edge of the plate. The drag varies with the gap ratio; it has the minimum value at a certain gap ratio for each Reynolds number. The drag sharply increases past the optimum gap ratio; this seems to be related to the sudden change in bubble size in the wake region. This trend is consistent with the experimental observation currently available in case of turbulent flow. It is also found that the net drag coefficient significantly depends on the variation of base suction coefficient.

Keywords

References

  1. Anderson, E. A., 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. Apelt, C. J. and West, G. S., 1975, 'The Effect of Wake Splitter Plates on Bluff-body Flow in the Range $10^4 < R < 5{\times}10^4$ : Part 2,' J. Fluid Mech., Vol. 71, pp. 145-160 https://doi.org/10.1017/S0022112075002479
  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., 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. Rathakrishnan, E., 1999, 'Effect of Splitter Plate on Bluff Body Drag,' AIAA, Vol. 37, No.9, pp. 1125-- 1126
  7. 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
  8. Park, J., Kwon, K., 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
  9. Kim, J., Moin, P., 1985, 'Application of a Fractional-Step Method to Incompressible Navier-Stokes Equations,' J. of camp. Phys., Vol. 59, pp. 308 - 323 https://doi.org/10.1016/0021-9991(85)90148-2
  10. Rosenfeld, M., Kwak, D., and Vinokur, M., 1994, 'A Fractional-Step Method for the Unsteady Incompressible Navier-Stokes Equations in Generalized Coordinate Systems,' J. of comp. Phys., Vol. 94, pp. 102 -137 https://doi.org/10.1016/0021-9991(91)90139-C
  11. Pauley, L. L., Moin, P., 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