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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…
Low-frequency variability in massive stars: Core generation or surface phenomenon?
Daniel Lecoanet, Matteo Cantiello, Eliot Quataert +6
Bowman et al. (2019) reported low-frequency photometric variability in 164 O- and B-type stars observed with K2 and TESS. They interpret these motions as internal gravity waves, wh…
Shape and size of large-scale vortices: A generic fluid pattern in geophysical fluid dynamics
Louis-Alexandre Couston, Daniel Lecoanet, Benjamin Favier +1
Planetary rotation organizes fluid motions into coherent, long-lived swirls, known as large-scale vortices (LSVs), which play an important role in the dynamics and long-term evolut…
Buoyancy-Driven Entrainment in Dry Thermals
Brett McKim, Nadir Jeevanjee, Daniel Lecoanet
\citet{turner1957} proposed that dry thermals entrain because of buoyancy (via a constraint which requires an increase in the radius ). This however, runs counter to the scaling…
Entropy Rain: Dilution and Compression of Thermals in Stratified Domains
Evan H. Anders, Daniel Lecoanet, Benjamin P. Brown
Large-scale convective flows called giant cells were once thought to transport the Sun's luminosity in the solar convection zone, but recent observations have called their existenc…
Dedalus: A Flexible Framework for Numerical Simulations with Spectral Methods
Keaton J. Burns, Geoffrey M. Vasil, Jeffrey S. Oishi +2
Numerical solutions of partial differential equations enable a broad range of scientific research. The Dedalus Project is a flexible, open-source, parallelized computational framew…
The "Sphered Cube": A New Method for the Solution of Partial Differential Equations in Cubical Geometry
Keaton J. Burns, Daniel Lecoanet, Geoffrey M. Vasil +2
A new gridding technique for the solution of partial differential equations in cubical geometry is presented. The method is based on volume penalization, allowing for the impositio…