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An inverse scattering treatment for the flow of an ideal fluid in two dimensions

M M Vishik and S Friedlander

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An inverse scattering 'recipe' is presented for obtaining the solution of a Lagrangian formulation of the Euler equations governing the motion of an unbounded two-dimensional ideal fluid. This formulation is given in terms of a so-called Lax pair of operators. The scattering data are viewed as a delta -data in order to apply the approach for multidimensional inverse scattering. The operator of the Lax pair associated with the spectral problem is treated as a perturbation of the analogous problem for the Laplacian. It is shown that solutions to the direct and inverse problems exist when, in an appropriate sense, this perturbation is small. A particular example is discussed in which the initial velocity has the asymptotic structure of a point vortex. In this case the explicit integral equation is exhibited for the eigenfunctions from which the flow description can be reconstructed.


PACS

47.10.A- Mathematical formulations

MSC

76M25 Other numerical methods

76M22 Spectral methods

Subjects

Fluid dynamics

Mathematical physics

Dates

Issue 2 (March 1993)



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