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Free surface flow visualisation

Figure 36

Point vortices. Re=150. Case 14

Figure 37

5
Conclusions

Results have been presented of both 2-D and 3-D computations of the vortex wake behind a cylinder towed through waves. The computations are at a Reynolds number of 150. A survey of the changing wake patterns as a function of the wave parameters is presented. These data are in good qualitative agreement with both data in the literature on vertical cylinders in steady flow undergoing in-line oscillations, and surface flow visualisation data conducted in the Department of Aeronautics wave flume. A 3-D computation proved computationally expensive, but demonstrated reasonable agreement with the 2-D computations, and provides useful experience for future research in this direction. A 3-D computation of flow past a linearly tapered cylinder in a steady current is also presented. The data show the spanwise cell formation observed in flow visualisation experiments carried out by the authors on an identical geometry.

6
Acknowledgements

This work was supported by the Office of Naval Research under contract No. N00014–90-J-4122.

7
References

E.Detemple-Laake and H.Eckelmann. Phenomenology of Kármán vortex streets in oscillatory flow. Exp. Fluids, 7:217–27, 1989.

M.Gaster. Vortex shedding from slender cones at low Reynolds numbers. J. Fluid Mech., 38:565–76, 1969.

J.M.R.Graham and R.H.Arkell. End of contract reports to ONR. Contract No. N00014– 90-J-4122. 1992 and 1995.

O.M.Griffin and S.E.Ramberg. Vortex shedding from a cylinder vibrating in line with an incident uniform flow. J. Fluid Mech., 75:257– 71, 1976.

H.Honji, S.Taneda and M.Tatsuno. Some practical details of the electrolytic precipitation method of flow visualization. Technical Report 89, Research Institute for Applied Mechanics, Kyushu University, 1980.

H.Lamb. Hydrodynamics. Cambridge Univ. Press, 1932.

J.Meneghini. Numerical Simulation of bluff body flow control using a discrete vortex method. PhD Thesis, Imperial College, London, 1993.

J.Peiro, J.Peraire and K.Morgan. FELISA System, Reference Manua.l 1994.

P.S.Piccirillo and C.W.Van Atta. An experimental study of vortex shedding behind a linearly tapered cylinder at low Reynolds number. J. Fluid Mech., 246:163–95, 1993.

C.H.K.Williamson. Three-dimensional vortex dynamics in the wake of a cylinder. In Fluid vortices, ed. S.I.Green. Dordrecht: Klumer Academic, 1995.



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