TECHNICAL PAPERS
Nov 1, 1994

Vortex Convection Produced by V‐Shaped Dihedral Obstruction

Publication: Journal of Hydraulic Engineering
Volume 120, Issue 11

Abstract

Strong convection can be produced by placing a V‐shaped plate in a horizontal flow. Vortices that shed from the plate coalesce with neighboring ones to form a horseshoe‐shaped vortex. The self‐induced upward motion produced due to the shape and the flow converging and surmounting the plate raises the vortex head, resulting in the vertical convection. The dependence of the motion of the three‐dimensional vortex filaments on the dihedral angle of the V‐shaped dihedral plate and Reynolds number of the mean flow have been numerically simulated. It was found that the maximum vortex raising height can be attained with a dihedral angle of about 90°

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References

1.
Asaeda, T., Horikawa, K., and Kaneko, M. (1991). “Vertical convection introduced by a V‐shaped plate structure.” Proc., Coastal Zone 91, ASCE, New York, N.Y., 297–308.
2.
Asaeda, T., Nakai, M., Manandhar, S. K., and Tamai, N. (1989). “Sediment entrainment in channel with rippled bed.” J. Hydr. Engrg., ASCE, 115(3), 327–339.
3.
Asaeda, T., Nakai, M., Tamai, N., and Horikawa, K. (1990). “Rising current production by a V‐shaped plate.” J. Hydr. Coast and Envir. Engrg., Tokyo, Japan, 473, 83–90 (in Japanese).
4.
Asaeda, T., Ozaki, T., Yoshida, K., Kondo, Y., and Goami, Y. (1991). “Upwelling current produced by a V‐shaped dihedral structure.” Proc., Ocean 91, Institute of Electrical and Electronics Engineering (IEEE), New York, N.Y., 413–418.
5.
Fiebig, M., Brockmeier, U., Mitra, N. K., Guntermann, T. (1989). “Structure of velocity and temperature fields in laminar channel flows with longitudinal vortex generators.” Numerical Heat Transfer, 15 (part A), 281–302.
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7.
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8.
Hunt, J. C. R., and Snyder, W. H. (1980). “Experiments on stably and neutrally stratified flows over a model three‐dimensional hill.” J. Fluid Mech., 96(4), 671–704.
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Ikeda, S., and Asaeda, T. (1983). “Sediment suspension with rippled bed.” J. Hydr. Engrg., ASCE, 109(3), 409–423.
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Leonard, A. (1985). “Computing three‐dimensional incompressible flows with vortex elements.” Annu. Rev. Fluid Mech., 17, 523–559.
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Marino Forum 21. (1990). “Development of artificial upwelling technology.” Rep., Tokyo, Japan, 16.
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Information & Authors

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Published In

Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 120Issue 11November 1994
Pages: 1274 - 1291

History

Received: Feb 19, 1993
Published online: Nov 1, 1994
Published in print: Nov 1994

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Authors

Affiliations

Takashi Asaeda, Associate Member, ASCE
Assoc. Prof., Dept. of Civ. and Envir. Engrg., Saitama Univ., Saitama 338, Japan
Pham Hong Son
Grad. Student, Dept. of Civ. and Envir. Engrg., Saitama Univ., Saitama 338, Japan
Steven Armfield
Lect., School of Mech. and Manufacturing Engrg., Univ. of New South Wales, Australia

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