Fluids, Meteorology and Symmetry seminars

These are the research seminars of the Fluids, Meteorology, and Symmetry Group.

Seminar details

Time and day: Our regular seminar slot is 2pm - 3pm on Wednesdays during term.
Venue: 22 AA 04.
Open to: Staff and students.

For further information, please contact the organiser Prof Tom Bridges.

Upcoming seminars

Speaker: John V. Shebalin (George Mason University, USA)
Time and date: 3pm - 4pm on Thursday 30 May 2019
Venue: 39AA04
Title: Magnetofluid turbulence, broken symmetry and the dynamo problem
Abstract: The problem of understanding if and how a magnetohydrodynamic (MHD) dynamo process could produce the Earth’s magnetic field was first proposed by Larmor in 1919. In 1995, Glatzmaier and Roberts demonstrated through numerical simulation that such an MHD dynamo process existed. There still remained the question of fundamental cause: What was it about MHD that allowed for the creation of a dominant, quasi-stationary geomagnetic dipole field? The magnetofluid in the Earth’s outer core is in a turbulent state and the answer as to fundamental cause appears to lie in the statistical mechanics of ideal MHD turbulence. Statistical theory makes the essential prediction that when a turbulent magnetofluid is in quasi-equilibrium, the magnetic energy in the dipole component is equal to the global magnetic helicity multiplied by the dipole wavenumber. Furthermore, theory predicts that the dipole magnetic field is quasi-stationary. Additional results indicate that a knowledge of the Earth's exterior magnetic dipole field allows for a robust estimate of the magnetic helicity and toroidal dipole field contained in the outer core. Numerical simulations indicate that these results also apply in the case of forced and dissipative, i.e., real MHD turbulence. Here, we describe the theoretical analysis and numerical simulations that lead to these conclusions. We also test an assertion that oblateness may be related to dipole alignment and find that while there is an effect, rotation appears to be far more important. Lastly, we discuss how inertial waves in a rotating magnetofluid might affect dipole alignment through dynamical symmetry breaking, though this is still an open question.

Past seminars

Speaker: Alain J. Brizard, Saint Michael’s College (USA)
Time and date: 3pm - 4pm on Tuesday 14 May  2019
Venue: 30BB03
Abstract: Find out more. 

Hydrodynamic pilot-waves: A wave-mediated non-linear non-smooth dynamical system that displays spontaneous pattern formation.
Speaker: Carlos Rios
Venue: 39AA04
Date: Wednesday 27 March 2019
Time: 3pm - 4pm
Abstract: Find out more.

A study of the stochastic resonance as a periodic random dynamical system
Speaker: Anna Maria Cherubini (Universita' del Salento)
Venue: 22 AA 04
Date: Thursday 14 June 2018
Time: 3pm - 4pm
Abstract: Find out more

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University of Surrey