Abstract
Abstract
Highlights
The geomagnetic field is induced by the liquid metal flow within Earth’s outer core via self-excited dynamo action
We investigate the effect of rotation on low Prandtl number thermal convection by means of laboratory experiments and direct numerical simulations (DNS)
Considering the potential importance of this finding with respect to the flow structures that underlie planetary dynamo generation, here we extend our low Pr rotating convection experimental system to include velocity measurements by means of ultrasound Doppler velocimetry (UDV) and complement our laboratory experiments with direct numerical simulation results
Summary
The geomagnetic field is induced by the liquid metal flow within Earth’s outer core via self-excited dynamo action. The detailed flow topology is unknown (Calkins et al 2012; Guervilly & Cardin 2016; Aurnou & King 2017; Kaplan et al 2017; Guervilly, Cardin & Schaeffer 2019), since the 3000 km thick silicate mantle hinders our ability to observe the core dynamics directly (Roberts & King 2013). Thermally driven global-scale dynamo models in low Prandtl number fluids, characteristic of liquid metals, cannot be carried out by direct numerical simulations (DNS) to date (Davies, Gubbins & Jimack 2009; Roberts & King 2013; Nataf & Schaeffer 2015; Schaeffer et al 2017).
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