On pointwise decay rates of time‐periodic solutions to the Navier–Stokes equation

Tomoyuki Nakatsuka

Mathematische Nachrichten, 2021, vol. 294, issue 1, 98-117

Abstract: We study the existence of a time‐periodic solution with pointwise decay properties to the Navier–Stokes equation in the whole space. We show that if the time‐periodic external force is sufficiently small in an appropriate sense, then there exists a time‐periodic solution {u,p} of the Navier–Stokes equation such that |∇ju(t,x)|=O(|x|1−n−j) and |∇jp(t,x)|=O(|x|−n−j)(j=0,1,…) uniformly in t∈R as |x|→∞. Our solution decays faster than the time‐periodic Stokes fundamental solution and the faster decay of its spatial derivatives of higher order is also described.

Date: 2021
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https://doi.org/10.1002/mana.201800377

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