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This paper is the continuation of a program, initiated in Grenier and Nguyen [SIAM J.Math. Anal. 51 (2019); J. Differential Equations 269 (2020)], to derive pointwise estimates on theGreen function of Orr–Sommerfeld equations. In this paper we focus on long wavelength perturbations, more precisely horizontal wave numbers\alphaof order\nu^{1/4}, which correspond to the lower boundary of the instability area for monotonic profiles.more » « less
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We prove the inviscid limit for the incompressible Navier-Stokes equations for data that are analytic only near the boundary in a general two-dimensional bounded domain. Our proof is direct, using the vorticity formulation with a nonlocal boundary condition, the explicit semigroup of the linear Stokes problem near the flatten boundary, and the standard wellposedness theory of Navier-Stokes equations in Sobolev spaces away from the boundary.more » « less
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