Abstract
A spiral point vortex, which is a point vortex with a source-sink structure, appears when we consider a two-dimensional cross section of a straight vortex line with a uniform flow in its axial direction in three-dimensional space. In the present paper, we present a computational theory for the motion of spiral point vortices in two-dimensional exterior domains that contain multiple rectilinear line segments as boundaries, called slit domains. The theory consists of the evolution equation for spiral point vortices in multiply connected domains and a numerical procedure to construct conformal mappings from multiply connected domains with circular boundaries onto given slit domains. It is applicable to many flow problems arising in biofluids and environmental flows. As an example, we apply the theory to the flow problem of finding force-enhancing equilibria consisting of two spiral point vortices in a slit domain with two parallel plates in the presence of a uniform flow, which is a two-dimensional model of a wind-turbine with vertical blades.
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References
Amano K., Okano D., Ogata H., Sugihara M.: Numerical conformal mappings onto the linear slit domain. Japan J. Ind. Appl. Math. 29, 165–186 (2012)
Baker H.: Abelian functions. Cambridge University Press, Cambridge (1995)
Crowdy D., Marshall J.: Analytic formulae for the Kirchhoff-Routh path function in multiply connected domains. Proc. R. Soc. A 61, 2477–2501 (2005)
Crowdy D.: Calculating the lift on a finite stack of cylindrical aerofoils. Proc. R. Soc. A 462, 1387–1407 (2006)
Crowdy, D., Marshall: Conformal mappings between canonical multiply connected domains. Comput. Methods Funct. Theory 6, 59–76 (2006)
Crowdy D.G., Marshall J.S.: Computing the Schottky–Klein prime function on the Schottky double of planar domains. Comput. Methods Funct. Theory 7, 293–308 (2007)
Crowdy D.: Schwarz–Christoffel mappings to unbounded multiply connected polygonal regions. Math. Proc. Camb. Philos. Soc. 142, 319–339 (2007)
Crowdy D.: Analytical formulae for source and sink flows in multiply connected domains. Theor. Comput. Fluid Dyn. 27, 1–19 (2013). doi:10.1007/s00162-012-0258-x
Cottet G.-H., Koumoutsakos P.D.: Vortex Methods Theory and Practice. Cambridge University Press, Cambridge (2000)
Huang, M.-K., Chow, C.-Y.: Trapping of a free vortex by Joukowski airfoils. AIAA paper 82-4059 (1981)
Hummel, D.: On the vortex formation over a slender wing at large angles of incidence. AGARD CP-247, 15 (1978)
Katsurada M., Okamoto H.: The collocation points of the fundamental solution method for the potential problem. Comput. Math. Appl. 31(1), 123–137 (1995)
Kochin N.E., Kibel I.A., Rose N.V.: Theoretical Hydrodynamics. Interscience Publishers, New York (1965)
Lentink D., Dickson W.B., van Leeuwen J.L., Dickinson M.H.: Leading-edge vortices elevate lift of autorotating plant seeds. Science 324, 1438–1440 (2009)
Mourtos N.J., Brooks M.: Flow past a flat plate with a vortex/sink combination. J. Appl. Mech. 63, 543–550 (1996)
Murashima S.: Charge Simulation Method and Its Application. Morikita, Tokyo (1983)
Newton P.K.: The N-Vortex Problem. Springer, New York (2001)
Newton P.K., Chamoun G.: Construction of point vortex equilibria via Brownian ratchets. Proc. R. Soc. A 463, 1525–1540 (2007)
Newton P.K., Ostrovskyi V.: Stationary equilibrium singularity distributions in the plane. Nonlinearity 25, 495–511 (2012)
Rossow, V.G.: Lift enhancement by an externally trapped vortex. AIAA paper 77-672 (1977)
Saffman P.G., Sheffield J.S.: Flow over a wing with an attached free vortex. Stud. Appl. Math. 57, 107–117 (1977)
Saffman P.G.: Vortex Dynamics. Cambridge University Press, Cambridge (1992)
Sakajo T.: Equation of motion for point vortices in multiply connected circular domains. Proc. R. Soc. A 465, 2589–2611 (2009)
Sakajo T.: Force-enhancing vortex equilibria for two parallel plates in uniform flow. Proc. R. Soc. A 468, 1175–1195 (2012)
Shiba, M.: On the Riemann–Roch theorem on open Riemann surfaces. J. Math. Kyoto Univ. 11, 495–525
Trefethen L.N., Bau D. III: Numerical Linear Algebra. SIAM Publishing, Philadelphia (1997)
See the webpage of Wikipedia at http://en.wikipedia.org/wiki/Vertical_axis_wind_turbine, 151–171. Accessed 14 Sept 2013
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Aoyama, N., Sakajo, T. & Tanaka, H. A computational theory for spiral point vortices in multiply connected domains with slit boundaries. Japan J. Indust. Appl. Math. 30, 485–509 (2013). https://doi.org/10.1007/s13160-013-0113-5
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DOI: https://doi.org/10.1007/s13160-013-0113-5