Role of phase synchronisation in turbulence
Artikel i vetenskaplig tidskrift, 2017

The role of the phase dynamics in turbulence is investigated. As a demonstration of the importance of the phase dynamics, a simplified system is used, namely the one-dimensional Burgers equation, which is evolved numerically. The system is forced via a known external force, with two components that are added into the evolution equations of the amplitudes and the phase of the Fourier modes, separately. In this way, we are able to control the impact of the force on the dynamics of the phases. In the absence of the direct forcing in the phase equation, it is observed that the phases are not stochastic as assumed in the Random Phase Approximation (RPA) models, and in contrast, the non-linear couplings result in intermittent locking of the phases to ± π/2. The impact of the force, applied purely on the phases, is to increase the occurrence of the phase locking events in which the phases of the modes in a wide k range are now locked to ± π/2, leading to a change in the dynamics of both phases and amplitudes, with a significant localization of the real space flow structures.

RPA

Kuramoto

Burgers turbulence

Författare

Sara Moradi

Koninklijke Militaire School

Bogdan Teaca

Coventry University

Johan Anderson

Astronomi och plasmafysik

AIP Advances

2158-3226 (ISSN)

Vol. 7 115213 1-10 115213

Ämneskategorier

Fysik

Annan fysik

Strömningsmekanik och akustik

Fundament

Grundläggande vetenskaper

DOI

10.1063/1.5003871