Rotating convective turbulence in Earth and planetary cores

JM Aurnou, MA Calkins, JS Cheng, K Julien… - Physics of the Earth and …, 2015 - Elsevier
An accurate description of turbulent core convection is necessary in order to build robust
models of planetary core processes. Towards this end, we focus here on the physics of …

A multiscale dynamo model driven by quasi-geostrophic convection

MA Calkins, K Julien, SM Tobias… - Journal of Fluid …, 2015 - cambridge.org
A convection-driven multiscale dynamo model is developed in the limit of low Rossby
number for the plane layer geometry in which the gravity and rotation vectors are aligned …

A computationally efficient spectral method for modeling core dynamics

P Marti, MA Calkins, K Julien - Geochemistry, Geophysics …, 2016 - Wiley Online Library
An efficient, spectral numerical method is presented for solving problems in a spherical shell
geometry that employs spherical harmonics in the angular dimensions and Chebyshev …

A transparent window into early-type stellar variability

AS Jermyn, EH Anders, M Cantiello - The Astrophysical Journal, 2022 - iopscience.iop.org
Subsurface convection zones are ubiquitous in early-type stars. Driven by narrow opacity
peaks, these thin convective regions transport little heat but play an important role in setting …

The breakdown of the anelastic approximation in rotating compressible convection: implications for astrophysical systems

MA Calkins, K Julien, P Marti - Proceedings of the …, 2015 - royalsocietypublishing.org
The linear theory for rotating compressible convection in a plane layer geometry is
presented for the astrophysically relevant case of low Prandtl number gases. When the …

Magnetic buoyancy instability and the anelastic approximation: regime of validity and relationship with compressible and Boussinesq descriptions

F Wilczyński, DW Hughes, E Kersalé - Journal of Fluid Mechanics, 2022 - cambridge.org
Magnetic buoyancy instability, which is of astrophysical importance, results from the
influence of magnetic pressure variations on the density of a fluid in a gravitational field. It is …

Convection-driven kinematic dynamos at low Rossby and magnetic Prandtl numbers: single mode solutions

MA Calkins, K Julien, SM Tobias, JM Aurnou, P Marti - Physical Review E, 2016 - APS
The onset of dynamo action is investigated within the context of a newly developed low
Rossby, low magnetic Prandtl number, convection-driven dynamo model. This multiscale …

Predicting the Rossby number in convective experiments

EH Anders, CM Manduca, BP Brown… - The Astrophysical …, 2019 - iopscience.iop.org
The Rossby number is a crucial parameter describing the degree of rotational constraint on
the convective dynamics in stars and planets. However, it is not an input to computational …

Convection-driven kinematic dynamos at low Rossby and magnetic Prandtl numbers

MA Calkins, L Long, D Nieves, K Julien, SM Tobias - Physical Review Fluids, 2016 - APS
Most large-scale planetary magnetic fields are thought to be driven by low Rossby number
convection of a low magnetic Prandtl number fluid. Here kinematic dynamo action is …

Onset of fully compressible convection in a rapidly rotating spherical shell

S Liu, ZH Wan, R Yan, C Sun, DJ Sun - Journal of Fluid Mechanics, 2019 - cambridge.org
Onset of fully compressible convection in a rapidly rotating spherical shell Page 1 J. Fluid
Mech. (2019), vol. 873, pp. 1090–1115. c Cambridge University Press 2019 doi:10.1017/jfm.2019.436 …