Abstract
We consider L 2-weak solutions to the Navier–Stokes system in a 3D exterior domain. Under the assumptions that the initial data decrease as \({O( |x|^{-\mu})}\) when \({|x| \to \infty}\), for some \({\mu \geq 7/6}\), and that the volume force decays sufficiently fast, we show that the velocity decreases pointwise with the rate \({O(\, |x|^{-\min\{\mu ,13/5\}})}\) for \({|x| \to \infty}\), uniformly with respect to time.
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Deuring, P. Pointwise Spatial Decay of Weak Solutions to the Navier–Stokes System in 3D Exterior Domains. J. Math. Fluid Mech. 17, 199–232 (2015). https://doi.org/10.1007/s00021-014-0198-x
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DOI: https://doi.org/10.1007/s00021-014-0198-x