Time-dependent force balance analysis in numerical simulations

Ayesha Sarwar (University of Glasgow)

Wednesday 14th May 15:00-16:00
Maths 311B

Abstract

The geodynamo, which sustains the Earth’s magnetic field through convectively-driven fluid motion in the outer core, is a fundamental, yet complex process that continues to challenge our understanding. The fluid flow is determined by the balance of forces in the momentum equation. These forces are inherently dependent on position, time, and scale. Recent studies have investigated this complexity through scale-dependent and position-dependent analyses, with some focusing on solenoidal forces. The solenoidal forces remove the gradient components of all forces, providing a clearer picture of the first-order EFFECTS. We present three-dimensional dynamo simulations in different dynamical regimes to investigate the temporal evolution of forces and their hierarchy. We also consider solenoidal forces to gain a better view of the force hierarchy.

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