Anomaly and Brownian fluid particle in Navier-Stokes turbulence

TL;DR

This paper reveals an intrinsic anomaly in stochastic Navier-Stokes turbulence, linking it to a Brownian damping coefficient and introducing a new fundamental law for stochastic fluid dynamics.

Contribution

It uncovers a hidden anomaly in stochastic Navier-Stokes turbulence and connects it to Brownian motion, providing a new perspective and law in turbulence theory.

Findings

Identification of a non-self-adjoint Jacobian operator anomaly.

Derivation of a Brownian damping coefficient for fluid particles.

Establishment of the anomaly as a fundamental feature of stochastic turbulence.

Abstract

We investigate the Navier-Stokes turbulence driven by a stochastic random Gaussian force. Using a field-theoretic approach, we uncover an anomaly that brings hidden structure to the theory. The anomaly is generated by a non-self-adjoint operator of the Jacobian and it follows the symmetries of the stochastic Navier-Stokes equation. We calculate the anomaly and demonstrate that by forcing the anomaly to vanish, the velocity field is constrained and a monopole-type object with a constant charge is formed. When the viscosity is zero, the anomaly can be interpreted as the Brownian damping coefficient of a random fluid particle. We provide the Brownian particle equation and its solution in the presence of a pump and viscosity. Our results suggest that the anomaly is an inherent feature of stochastic turbulence and must be taken into account in all stochastic turbulence calculations. This constitutes an additional law for the original set of stochastic Navier-Stokes equations.