Publication

Navier-Stokes with a fractional transport noise as a limit of multi-scale dynamics

2026

Abstract

We define a bona fide rough path solution for the Navier-Stokes equation with an additional rough transport term, and show that the SPDE on the three-dimensional torus driven by a fractional Brownian motion on H σ has solutions characterised as the effective limits of a slow/fast system. We further show that this rough path solution is equivalent to the widely used incremental notion of solution (the unbounded rough driver formulation), demonstrating broader applicability to other nonlinear SPDEs.

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Navier-Stokes with a fractional transport noise as a limit of multi-scale dynamics

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