skip to main content

Title: Statistical simulation of the magnetorotational dynamo

We analyze turbulence and dynamo induced by the magnetorotational instability (MRI) using quasi-linear statistical simulation methods. We find that homogenous turbulence is unstable to a large scale dynamo instability, which saturates to an inhomogenous equilibrium with a very strong dependence on the magnetic Prandtl number (Pm). Despite its enormously reduced nonlinearity, the quasi-linear model exhibits the same qualitative scaling of angular momentum transport with Pm as fully nonlinear turbulence. This demonstrates the relationship of recent convergence problems to the large scale dynamo and suggests possible methods for studying astrophysically relevant regimes at very low or high Pm.
Authors:
 [1] ;  [1]
  1. PPPL
Publication Date:
OSTI Identifier:
1182199
Report Number(s):
PPPL-5060
DOE Contract Number:
DE-AC02-09CH11466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review letters
Publisher:
Physical Review letters
Research Org:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Orgs:
Princeton Plasma Physics Laboratory
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY MRI instability; magnetic Prandtl number (Pm)