500 citations · 1.2k across the 40 of their papers we have counts for
41 papers
Orientational order on non-orientable domains
Gianmarco Spera, Axel Fotso Ndefo, Keaton J. Burns +1
We study the statistical properties of passive and active many-body systems with orientational degrees of freedom on non-orientable domains. By rephrasing topological constraints a…
The Unsteady Taylor--Vortex Dynamo is Fast
Liam O'Connor, Daniel Lecoanet, Geoffrey M. Vasil +6
Astrophysical and geophysical fluids commonly generate organized magnetic fields, despite having enormous magnetic Reynolds numbers and abundant small-scale turbulence. F…
Instability triggered by mixed convection in a thin fluid layer
Florian Rein, Keaton J. Burns, Stefan G. Llewellyn Smith +3
We investigate the convective stability of a thin, infinite fluid layer with a rectangular cross-section, subject to imposed heat fluxes at the top and bottom and fixed temperature…
Steady advection-diffusion in multiply-connected potential flows
Kyle McKee, Keaton Burns
We consider the steady heat transfer between a collection of impermeable obstacles immersed in an incompressible 2D potential flow, when each obstacle has a prescribed boundary tem…
Fast automated adjoints for spectral PDE solvers
Calum S. Skene, Keaton J. Burns
We present a general and automated approach for computing model gradients for PDE solvers built on sparse spectral methods, and implement this capability in the widely used open-so…
Multiple scales analysis of a nonlinear timestepping instability in simulations of solitons
Benjamin A. Hyatt, Daniel Lecoanet, Evan H. Anders +1
The susceptibility of timestepping algorithms to numerical instabilities is an important consideration when simulating partial differential equations (PDEs). Here we identify and a…
Rapidly Rotating Wall-Mode Convection
Geoffrey M. Vasil, Keaton J. Burns, Daniel Lecoanet +3
In the rapidly rotating limit, we derive a balanced set of reduced equations governing the strongly nonlinear development of the convective wall-mode instability in the interior of…
The solar dynamo begins near the surface
Geoffrey M Vasil, Daniel Lecoanet, Kyle Augustson +5
The Sun's magnetic dynamo cycle features a distinct pattern: a propagating region of sunspot emergence appears around 30 degrees latitude and vanishes near the equator every 11 yea…
Iterative Methods for Navier--Stokes Inverse Problems
Liam O'Connor, Daniel Lecoanet, Evan H. Anders +5
Even when the partial differential equation underlying a physical process can be evolved forward in time, the retrospective (backward in time) inverse problem often has its own cha…
The photometric variability of massive stars due to gravity waves excited by core convection
Evan H. Anders, Daniel Lecoanet, Matteo Cantiello +8
Massive stars die in catastrophic explosions, which seed the interstellar medium with heavy elements and produce neutron stars and black holes. Predictions of the explosion's chara…
Formulation and calibration of CATKE, a one-equation parameterization for microscale ocean mixing
Gregory LeClaire Wagner, Adeline Hillier, Navid C. Constantinou +7
We describe CATKE, a parameterization for fluxes associated with small-scale or "microscale" ocean turbulent mixing on scales between 1 and 100 meters. CATKE uses a downgradient fo…
Vortex line entanglement in active Beltrami flows
Nicolas Romeo, Jonasz Slomka, Jorn Dunkel +1
Over the last decade, substantial progress has been made in understanding the topology of quasi-2D non-equilibrium fluid flows driven by ATP-powered microtubules and microorganisms…
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…
Corner cases of the tau method: symmetrically imposing boundary conditions on hypercubes
Keaton J. Burns, Daniel Fortunato, Keith Julien +1
Polynomial spectral methods produce fast, accurate, and flexible solvers for broad ranges of PDEs with one bounded dimension, where the incorporation of general boundary conditions…
Dynamics, scaling behavior, and control of nuclear wrinkling
Jonathan A. Jackson, Nicolas Romeo, Alexander Mietke +5
The cell nucleus is enveloped by a complex membrane, whose wrinkling has been implicated in disease and cellular aging. The biophysical dynamics and spectral evolution of nuclear w…
The Stability of Prendergast Magnetic Fields
Emma Kaufman, Daniel Lecoanet, Evan H. Anders +4
Convection in massive main sequence stars generates large scale magnetic fields in their cores which persists as they evolve up the red giant branch. The remnants of these fields m…
Emergent universal statistics in nonequilibrium systems with dynamical scale selection
Vili Heinonen, Abel J. Abraham, Jonasz Słomka +3
Pattern-forming nonequilibrium systems are ubiquitous in nature, from driven quantum matter and biological life forms to atmospheric and interstellar gases. Identifying universal a…
Direct Statistical Simulation of the Busse Annulus
Jeffrey S. Oishi, Keaton J. Burns, J. B. Marston +1
We consider direct statistical simulation (DSS) of a paradigm system of convection interacting with mean flows. In the Busse Annulus model zonal jets are generated through the inte…
Effective drag in rotating, poorly conducting plasma turbulence
Santiago J. Benavides, Keaton J. Burns, Basile Gallet +1
Despite the increasing sophistication of numerical models of hot Jupiter atmospheres, the large time-scale separation required in simulating the wide range in electrical conductivi…
Transport and emergent stratification in the equilibrated Eady model: the vortex gas scaling regime
Basile Gallet, Benjamin Miquel, Gabriel Hadjerci +3
We numerically and theoretically investigate the Boussinesq Eady model, where a rapidly rotating density-stratified layer of fluid is subject to a meridional temperature gradient i…
Inverse cascade suppression and shear layer formation in MHD turbulence subject to a guide field and misaligned rotation
Santiago J. Benavides, Keaton J. Burns, Basile Gallet +2
Astrophysical plasmas are often subject to both rotation and large-scale background magnetic fields. Individually, each is known to two-dimensionalize the flow in the perpendicular…
Single-hemisphere dynamos in M-dwarf stars
Benjamin P. Brown, Jeffrey S. Oishi, Geoffrey M. Vasil +2
M-dwarf stars below a certain mass are convective from their cores to their photospheres. These fully convective objects are extremely numerous, very magnetically active, and the l…
Improved phase-field models of melting and dissolution in multi-component flows
Eric W. Hester, Louis-Alexandre Couston, Benjamin Favier +2
We develop and analyse the first second-order phase-field model to combine melting and dissolution in multi-component flows. This provides a simple and accurate way to simulate cha…
The Magnetorotational Instability Prefers Three Dimensions
Jeffrey S. Oishi, Geoffrey M. Vasil, Morgan Baxter +4
The magnetorotational instability (MRI) occurs when a weak magnetic field destabilises a rotating, electrically conducting fluid with inwardly increasing angular velocity. The MRI…