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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

Wave-driven dynamo action in spherical magnetohydrodynamic systems.

K Reuter¹, F Jenko, A Tilgner

¹Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, D-85748 Garching, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 7, 2010

Summary

This summary is machine-generated.

This study reveals a time-periodic flow acting as a dynamo, generating internal waves and exhibiting resonant magnetic field growth. This cyclic dynamo mechanism offers insights for future dynamo experiments.

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Area of Science:

Fluid Dynamics
Plasma Physics
Magnetohydrodynamics

Background:

Numerical simulations explore mechanically forced two-vortex flow within a sphere.
The study focuses on the intermediate regime between laminar flow and developed turbulence.

Purpose of the Study:

Investigate hydrodynamic instabilities generating internal waves.
Analyze the dynamo action of a time-periodic flow.
Understand magnetic field generation and growth dynamics.

Main Methods:

Hydrodynamic and magnetohydrodynamic numerical simulations.
Analysis of flow instabilities and wave generation (m=2 zonal wave number).
Examination of magnetic field induction and growth rates.

Main Results:

A hydrodynamic instability generates internal waves.
The time-periodic flow acts as a dynamo, distinct from its snapshots or mean flow.
Magnetic field growth shows resonance effects tied to wave frequency.
A cyclic self-killing and self-recovering dynamo mechanism is identified.

Conclusions:

The dynamo mechanism involves mixing nonorthogonal eigenstates of the magnetic induction equation.
This findings have potential relevance for dynamo experiments.
The study elucidates complex dynamics in transitional flow regimes.