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Asymptotic profiles of nonstationary incompressible Navier-Stokes flows in the whole space. (English) Zbl 0995.35046

Summary: Asymptotic profiles are deduced for weak and strong solutions of the incompressible Navier-Stokes equations in the whole space. It is shown that if the initial velocity satisfies a specific moment condition, the corresponding solution behaves like the first-order spatial derivatives of the heat kernel. Higher-order asymptotics are also deduced in case the initial data admit vector potentials with spatial decay of order \(-n\). We further note that the results are not optimal and suggest by means of an example that there exist solutions with a more rapid (space-time) decay property if we require certain symmetry conditions to the initial data.

MSC:

35Q30 Navier-Stokes equations
76D05 Navier-Stokes equations for incompressible viscous fluids
35B40 Asymptotic behavior of solutions to PDEs
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