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Stationary solutions of the Navier-Stokes equations in a half-plane downstream of an obstacle: `universality' of the wake

Guillaume van Baalen

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Recommended by W J Zakrzewski

We consider stationary solutions of the incompressible Navier-Stokes equations for exterior domains in two dimensions with a non-zero asymptotic flow u at infinity. Under the restriction that the obstacle (the complement of the exterior domain) is symmetric around an axis parallel to u, we prove that asymptotically in the down-stream direction, the leading-order deviation from the constant flow approaches a universal shape which depends only on one parameter, namely the net force exerted by the fluid on the obstacle in the direction of u. To get this result, we show that the (elliptic) Navier-Stokes equations can be interpreted as a dynamical system, the down-stream direction playing the role of time, which shares some aspects with a parabolic partial differential equation.


PACS

47.10.ad Navier-Stokes equations

02.30.Jr Partial differential equations

47.27.wb Turbulent wakes

MSC

76D05 Navier-Stokes equations (See also 35Q30)

76D25 Wakes and jets

35Q30 Stokes and Navier-Stokes equations (See also 76D05, 76D07, 76N10)

Subjects

Fluid dynamics

Mathematical physics

Dates

Issue 2 (March 2002)

Received 27 February 2001, in final form 11 December 2001

Published 11 February 2002



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