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Graduate Student Seminar - 3/15/2019

"Forecasting Time Evolution of the 3M Sodium Sphere with Reservoir Computer"

by Artur Perevalov

Advisor:  Professor Dan Lathrop

Friday, March 15, 2019 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Abstract: The source of the Earth's magnetic field is the turbulent flow of liquid metal in the outer core. Our experiment's goal is to create Earth-like dynamo, to explore the mechanisms and to understand the dynamics of the magnetic and velocity fields. Since it is a complicated system, predictions of the magnetic field is a challenging problem. We present results of mimicking the three-meter experiment by a reservoir computer deep learning algorithm and comparison with predictions that are done by other techniques. The experiment is a three-meter diameter outer sphere and a one-meter diameter inner sphere with the gap filled with liquid sodium. The spheres can rotate up to 4 and 14 Hz, respectively, giving a Reynolds number up to 1.5 x 108. Two external electromagnets apply magnetic fields, while an array of 31 external and 2 internal Hall sensors measure the resulting induced fields. We use this magnetic probe data to train a reservoir computer to predict the 3M time evolution and mimic waves in the experiment. Surprisingly accurate predictions can be made for several magnetic dipole time scales. This shows that such a complicated MHD system’s behavior can be predicted.

For additional information about the IREAP Graduate Student Seminars, contact Artur Perevalov.

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