A systematic route to subcritical dynamo branches
arXiv:2112.11376 · doi:10.1103/PhysRevLett.129.024502
Abstract
We demonstrate that the nonlinear optimisation of a finite-amplitude disturbance over a freely evolving and possibly even turbulent flow, can successfully identify subcritical dynamo branches as well as the structure and amplitude of their critical perturbations. As this approach does not require prior knowledge of the magnetic field amplification mechanisms, it opens a new avenue for systematically probing subcritical dynamo flows.
References in corpus (20)
- Dynamo action by differential rotation in a stably stratified stellar interior
- Magnetars
- Dedalus: A Flexible Framework for Numerical Simulations with Spectral Methods
- Enhanced Angular Momentum Transport in Accretion Disks
- On the Origin of Cosmic Magnetic Fields
- Angular Momentum Transport in Stellar Interiors
- Laboratory evidence of dynamo amplification of magnetic fields in a turbulent plasma
- Dynamo theories
- Numerical study of dynamo action at low magnetic Prandtl numbers
- On the Magnetic Prandtl Number Behavior of Accretion Disks
- A self-sustaining nonlinear dynamo process in Keplerian shear flows
- Precessing spherical shells: flows, dissipation, dynamo and the lunar core
- Time-resolved fast turbulent dynamo in a laser plasma
- On self-sustaining processes in Rayleigh-stable rotating plane Couette flows and subcritical transition to turbulence in accretion disks
- Subcritical dynamo bifurcation in the Taylor Green flow
- Transition to magnetorotational turbulence in Taylor--Couette flow with imposed azimuthal magnetic field
- Disruption of SSP/VWI states by a stable stratification
- Optimization of the magnetic dynamo
- Dynamo Action in a Quasi-Keplerian Taylor-Couette Flow
- Self-excitation in a helical liquid metal flow: The Riga dynamo experiments