Investigation of flowfield characteristics of a square prism having a front triangular prism by PIV

- Journal title : Journal of the Korean Society of Marine Engineering
- Volume 40, Issue 3, 2016, pp.205-209
- Publisher : Korean Society of Marine Engineers
- DOI : 10.5916/jkosme.2016.40.3.205

Title & Authors

Investigation of flowfield characteristics of a square prism having a front triangular prism by PIV

Ro, Ki-Deok; Kim, Jae-Dong;

Ro, Ki-Deok; Kim, Jae-Dong;

Abstract

The flowfield characteristics of a square prism having a small triangular prism at the upstream side were investigated by visualizing the flow field using PIV. The ratio of the width of the triangular prism to that of the square prism and the gap ratios between the square and triangular prisms were selected as the experimental parameters. The results are summarized as follows. The Strouhal number measured on the wake side of the square prism, which had the same characteristics as the drag reduction rate, increased, and then decreased with the gap ratio for the same width ratio. For a square prism having a small triangular prism, the stagnation regions were represented at the upstream and downstream sides of the square prism. The size of the stagnation region increased with the width ratio at the upstream side of the square prism, and decreased at the downstream side.

Keywords

Fluid force reduction;PIV;Square prism;Flow control;Triangular prism;

Language

Korean

References

1.

M. Gad-el-Hak, "Modern developments in flow control," Applied Mechchanics, Reviews, vol. 49, no. 7, p. 365, 1996.

2.

T. Tamura and T. Miyagi, "The effect of turbulence on aerodynamic forces on a square cylinder with various corner shapes," Journal of Wind Engineering and Industrial Aerodynamics, vol. 83, pp. 135-145, 1999.

3.

K. D. Ro and K. S. Kim, "Fluid force reduction characteristics of a square prism having fences on the corner," Journal of the Korean Society of Marine Engineering, vol. 30, no. 3, pp. 389-395, 2006 (in Korean).

4.

W. C. Park, "Effect of the length of a splitter plate on drag reduction," Transactions of the Korean Society of Mechanical Engineers B, vol. 17, no. 11, pp. 2809-2815, 1993 (in Korean).

5.

C. J. Doolan, "Flat-Plate interaction with the near wake of a square cylinder," The American Institute of Aeronautics and Astronautics Journal, vol. 47, no. 2 pp. 475-478, 2009.

6.

K. D. Ro, S. M. Yoon, D. H. Choi, J. H. Kim, and E. C. Sim, "Drag reduction on a square prism using a detached splitter plate," Journal of the Korean Society of Marine Engineering, vol. 36, no. 6, pp. 808-813, 2012 (in Korean).

7.

K. D. Ro, "Characteristic analysis of flowfield around a square prism having a detached splitter plate using the PIV," Journal of the Korean Society of Marine Engineering, vol. 37, no. 4, pp. 338-343, 2013 (in Korean).

8.

K. D. Ro, "Characteristic calculation of flowfield around a square prism having a detached splitter plate using vortex method," Journal of the Korean Society of Marine Engineering, vol.3 7, no. 2, pp. 156-162, 2013.

9.

T. Igarashi, "Drag reduction of a square prism by flow control using a small rod," Journal of Wind Engineering and Industrial Aerodynamics, vol. 69, no. 71, pp. 141-153, 1997.

10.

H. Sakamoto, K. Tan, N. Takeuchi, and H. Haniu, "Suppression of fluid forces actiong on a square prism by passive control," Journal of Fluids Engineering, vol. 119, pp. 506-511, 1997.

11.

K. D. Ro, D. B. Jo, Y. J. Yoon, and S. J. Park, "Experiments of flowfield of a square prism having a small vertical plate," Journal of the Korean Society of Marine Engineering, vol. 38, no. 6, pp. 900-908, 2014 (in Korean).

12.

K. D. Ro, "Characteristics of fluid force reduction of a square prism with a small triangular prism," Journal of the Korean Society of Marine Engineering, vol. 39, no. 3, pp. 338-343, 2015 (in Korean).