96 citations · 395 across the 25 of their papers we have counts for
25 papers
Internal heating in rapidly rotating convection is not a shortcut to geostrophic turbulence
Justin A. Nicoski, Tobias G. Oliver, Stefano Maffei +1
Convective turbulence in planets and stars is often driven by internal heating. This forcing mechanism has also been proposed as a means of accessing the diffusion-free scalings of…
Effects of global core-mantle boundary topography on outer-core convection and topographic torques
Tobias G. Oliver, Eric G. Blackman, John A. Tarduno +1
Topography at the core-mantle boundary (CMB) couples the outer core to the mantle and likely generates observable variations in the length of day (LOD) and the geomagnetic field…
Quasi-geostrophic Rayleigh-Bénard convection on the tilted -plane
Benjamin Miquel, Abram Ellison, Michael A. Calkins +2
Rapidly rotating Rayleigh-Bénard convection on a -plane at colatitude is investigated numerically using an asymptotically reduced equation set valid in the limit o…
Asymptotics of spherical dynamos exhibiting a small-scale MAC balance
Justin A. Nicoski, Andy Esseln, Chris Davies +1
Understanding the asymptotic behaviour of numerical dynamo models is critical for extrapolating results to the physical conditions that characterise terrestrial planetary cores. He…
Boundary layers in quasi-static magnetoconvection with a vertical field and their implications for heat transport
Talal AlRefae, Michael A. Calkins
Heat transport in quasi-static magnetoconvection with a vertical magnetic field in a plane layer geometry is investigated with direct numerical simulations and asymptotic theory in…
Turbulence in Earth's core generates large topographic torques on the mantle
Tobias G. Oliver, Eric G. Blackman, John A. Tarduno +1
Seismic and geodynamic studies indicate that the boundary between the Earth's liquid outer core and solid mantle is not spherical, but is likely characterized by topography in the…
A numerical investigation of quasi-static magnetoconvection with an imposed horizontal magnetic field
Michael A. Calkins, Talal AlRefae, Angel Hernandez +2
Quasi-static Rayleigh-Bénard convection with an imposed horizontal magnetic field is investigated numerically for Chandrasekhar numbers up to with stress free boundary con…
Asymptotic scaling relations for rotating spherical convection with strong zonal flows
Justin A. Nicoski, Anne R. O'Connor, Michael A. Calkins
We analyse the results of direct numerical simulations of rotating convection in spherical shell geometries with stress-free boundary conditions, which develop strong zonal flows.…
The Puzzling Structure of Solar Convection: Window into the Dynamo
Nicholas A. Featherstone, Kyle C. Augustson, Jonathan M. Aurnou +25
The operation of the solar dynamo, with all of its remarkable spatio-temporal ordering, remains an outstanding problem of modern solar physics. A number of mechanisms that might pl…
Small scale quasi-geostrophic convective turbulence at large Rayleigh number
Tobias G. Oliver, Adrienne S. Jacobi, Keith Julien +1
A numerical investigation of an asymptotically reduced model for quasi-geostrophic Rayleigh-Bénard convection is conducted in which the depth-averaged flows are numerically suppres…
Asymptotic behaviour of rotating convection-driven dynamos in the plane layer geometry
Ming Yan, Michael A. Calkins
Dynamos driven by rotating convection in the plane layer geometry are investigated numerically for a range of Ekman number (), magnetic Prandtl number () and Rayleigh number…
Quasi-static magnetoconvection with a tilted magnetic field
Justin A. Nicoski, Ming Yan, Michael A. Calkins
A numerical study of convection with stress-free boundary conditions in the presence of an imposed magnetic field that is tilted with respect to the direction of gravity is carried…
Strong large scale magnetic fields in rotating convection-driven dynamos: the important role of magnetic diffusion
Ming Yan, Michael A. Calkins
Natural dynamos such as planets and stars generate global scale magnetic field despite the inferred presence of small scale turbulence. Such systems are known as large scale dynamo…
Efficiency gains of a multi-scale integration method applied to a scale-separated model for rapidly rotating dynamos
Krasymyr Tretiak, Meredith Plumley, Michael Calkins +1
Numerical geodynamo simulations with parameters close to an Earth-like regime would be of great interest for understanding the dynamics of the Earth's liquid outer core and the ass…
On the inverse cascade and flow speed scaling behavior in rapidly rotating Rayleigh-Bénard convection
S. Maffei, M. J. Krouss, K. Julien +1
Rotating Rayleigh-Bénard convection is investigated numerically with the use of an asymptotic model that captures the rapidly rotating, small Ekman number limit, …
Heat transfer and flow regimes in quasi-static magnetoconvection with a vertical magnetic field
Ming Yan, Michael A. Calkins, Stefano Maffei +3
Numerical simulations of quasi-static magnetoconvection with a vertical magnetic field are carried out up to a Chandrasekhar number of over a broad range of Rayleigh numbe…
Magnetic quenching of the inverse cascade in rapidly rotating convective turbulence
Stefano Maffei, Michael A. Calkins, Keith Julien +1
We present results from an asymptotic magnetohydrodynamic model that is suited for studying the rapidly rotating, low viscosity regime typical of the electrically conducting fluid…
Prandtl-Number Effects in High-Rayleigh-Number Spherical Convection
Ryan J. Orvedahl, Michael A. Calkins, Nicholas A. Featherstone +1
Convection is the predominant mechanism by which energy and angular momentum are transported in the outer portion of the Sun. The resulting overturning motions are also the primary…
Inertia-less convectively-driven dynamo models in the limit of low Rossby number and large Prandtl number
Michael A. Calkins, Keith Julien, Steven M. Tobias
Compositional convection is thought to be an important energy source for magnetic field generation within planetary interiors. The Prandtl number, , characterizing compositiona…
Convection-driven kinematic dynamos at low Rossby and magnetic Prandtl numbers
Michael A. Calkins, Louie Long, David Nieves +2
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 investig…
A nonlinear model for rotationally constrained convection with Ekman pumping
Keith Julien, Jonathan M. Aurnou, Michael A. Calkins +4
It is a well established result of linear theory that the influence of differing mechanical boundary conditions, i.e., stress-free or no-slip, on the primary instability in rotatin…
Convection-driven kinematic dynamos at low Rossby and magnetic Prandtl numbers: single mode solutions
Michael A. Calkins, Keith Julien, Steven M. Tobias +2
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 model re…
The asymptotic equivalence of fixed heat flux and fixed temperature thermal boundary conditions for rapidly rotating convection
Michael A. Calkins, Kevin Hale, Keith Julien +3
The influence of fixed temperature and fixed heat flux thermal boundary conditions on rapidly rotating convection in the plane layer geometry is investigated for the case of stress…
A Multiscale Dynamo Model Driven by Quasi-geostrophic Convection
Michael A. Calkins, Keith Julien, Steven M. Tobias +1
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. The s…