Force balances in dynamo simulations

Emma Hunter (University of Glasgow)

Wednesday 23rd April 15:00-16:00 Maths 311B

Abstract

There has been significant progress in understanding the applicability of numerical dynamo simulations to natural dynamos in recent years as computing power has improved. This has allowed the identification of dynamo regimes relevant to Earth’s core. One way of doing so is to replicate the expected force balance of Earth's core where Coriolis and Lorentz forces are expected to play an important role. Several recent studies have focused on the lengthscale dependence of the forces and solenoidal forces, with some studies examining crossover lengthscales of forces. We review the lengthscale dependence of forces and solenoidal forces and relevant crossover lengthscales. We also present new results where the triple balance found in each regime is compared to the kinetic energy spectrum.

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