Seminar by Dr. Jian-Zhou Zhu - "Chiroids'' statistical absolute equilibrium and chirality of (magneto) fluid turbulence
Date
Location
Description
Physics and Biology Unit would like to invite you to an upcoming seminar by Dr. Jian-Zhou Zhu.
Date: Tuesday, July 30 2013
Time: 1:00-2:30p.m.
Venue: C016, Lab 1
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Speaker: Jian-Zhou Zhu, Ph.D.
Title: "Chiroids'' statistical absolute equilibrium and chirality of (magneto) fluid turbulence
Abstract:
An incompressible hydrodynamic-type system can be reduced to the dynamics
of chiroids (a la Kelvin) with helical wave/mode representation. Left- and right-handed
chiral sectors of the absolute statistical equilibrium spectra are split, and either sector
may present without the necessity of the existence of the other, i.e. unichirally. One
sector can dominate around its positive pole(s) with corresponding net helicity. New
insights about turbulence of various systems concerning chirality (selection and
amplification) and spectral transfers follow.
In this talk, I will focus on the cases of pure hydrodynamics and single-fluid
magnetohydrodynamics, discussing relevant issues such as turbulence cascade and
dynamo with new perspectives, especially those phenomena observed for a long time but
not well explained by the classical helical Fourier absolute equilibria [R. H. Kraichnan, J.
Fluid Mech. 59, 745 (1973); U. Frisch, A. Pouquet, J. Leorat and A. Mazure, J. Fluid
Mech. 68, 769 (1975)]. If time permits, I may talk about more involved plasma physics,
such as whistler/helicon waves, ion cyclotron waves etc., which may find their roles in
space/astrophysics and fusion science.
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Host: Jonathan Miller, Physics and Biology Unit
We look forward to seeing many of you.
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