Conference publications

Abstracts

XVII conference

Axisymmetric flow patterns past a pair of partially shrouded rotating cylinders

Dudchenko O., Guria G.¹

Moscow Institute of Physics and Technology, Institutskiy per. 9, Dolgoprudnyy, 141700, Russia, (499) 761-13-71, dudcha@blood.ru

¹National Research Center for Hematology, RAMS, Novyy Zykovskiy proezd 4, Moscow, 125167, Russia, (495) 614-99-48, guria@blood.ru

1 pp. (accepted)

The prospects of using rotating cylinders in various flow control techniques have been discussed in the literature for a long time [1, 2]. In particular moving surface boundary layer control method is often implemented through the use of cylindrical structures [3]. Partial shielding of the moving surface in the framework of this method ensures directional injection of the angular momentum into the upcoming flow and provides additional means for active flow control.

The current study presents a numerical investigation of two-dimensional axisymmetric flow patterns past a pair of partially shielded rotating cylinders. The shroud is aligned in such a way that the unshielded moving section faces the incident flow. The dependence of flow topology on tangential speed of the cylinder surface and on the incident flow speed is investigated for Reynolds numbers from 0 to 100.

The results indicate that several qualitatively different patterns of fluid motion are possible in the flow domain. In particular solutions with a pair of free stationary eddies located in front of the cylinders are shown to exist in a wide range of governing parameters. A characteristic behavior in response to the increase of flow intensity is demonstrated for these secondary motions. The connection between discovered solutions and regimes of peristaltic pumping in elastic vessels is discussed.

References

1. Flettner A. Arrangement for exchanging energy between a current and a body therein. – US Patent No. 1674169, 1928.

2. Merkulov V.I. Flow control (in Russian). – Novosibirsk: Nauka, 1981. 174 pages.

3. Modi V.J. Moving surface boundary-layer control: A review // Journal of Fluids and Structures Vol. 11, 1997. Pp. 627-663.

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