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Force-enhancing vortex equilibria for two parallel plates in uniform flow
| Title: | Force-enhancing vortex equilibria for two parallel plates in uniform flow |
| Authors: | Sakajo, Takashi Browse this author →KAKEN DB |
| Keywords: | point vortex equilibria | | multiply connected domains | | Brownian ratchets |
| Issue Date: | 8-Apr-2012 |
| Publisher: | The Royal Society |
| Journal Title: | Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences |
| Volume: | 468 |
| Issue: | 2140 |
| Start Page: | 1175 |
| End Page: | 1195 |
| Publisher DOI: | 10.1098/rspa.2011.0617 |
| Abstract: | A two-dimensional potential flow in an unbounded domain with two parallel plates is considered. We examine whether two free point vortices can be trapped near the two plates in the presence of a uniform flow and observe if these stationary point vortices enhance the force on the plates. The present study is an extension of the work by Saffman & Sheffield (1977), in which a free point vortex over a single plate is investigated. The flow problem is motivated by an airfoil design problem for the double wings. Moreover, it also contributes to a design problem for an efficient wind turbine with vertical blades. In order to obtain the point-vortex equilibria numerically, we make use of a linear algebraic algorithm combined with a stochastic process, called the Brownian ratchet scheme. The ratchet scheme allows us to capture a family of stationary point vortices in multiply connected domains with ease. As a result, we find that stationary point vortices exist around the two plates and they enhance the downward force and the counter-clockwise rotational force acting on the two plates. |
| Relation: | http://rspa.royalsocietypublishing.org/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/48854 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 坂上 貴之
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