Evan H. Anders
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View article: Morphological Regimes of Rotating Moist Convection
Morphological Regimes of Rotating Moist Convection Open
Moist convection is a physical process in planetary atmospheres where the latent heat released by condensation acts as a buoyancy source that can enhance or even trigger an overturning convective instability. Since the saturation temperatu…
View article: Meridional Circulation Molecular-weighted
Meridional Circulation Molecular-weighted Open
Meridional circulation in stratified stellar/planetary interiors in the presence of stable molecular-weight gradients remains poorly understood, thereby affecting angular momentum transport in evolutionary models. We extend the downward co…
View article: Meridional circulation molecular-weighted
Meridional circulation molecular-weighted Open
Meridional circulation in stratified stellar/planetary interiors in the presence of stable molecular weight gradients remains poorly understood, thereby affecting angular momentum transport in evolutionary models. We extend the downward co…
View article: 3D Simulations Demonstrate Propagating Thermohaline Convection for Polluted White Dwarfs
3D Simulations Demonstrate Propagating Thermohaline Convection for Polluted White Dwarfs Open
Polluted white dwarfs (WDs) with small surface convection zones deposit significant concentrations of heavy elements to the underlying radiative interior, presumably driving thermohaline convection. Current models of polluted WDs frequentl…
View article: Morphological Regimes of Rotating Moist Convection
Morphological Regimes of Rotating Moist Convection Open
Moist convection is a physical process where the latent heat released by condensation acts as a buoyancy source that can enhance or even trigger an overturning convective instability. Since the saturation temperature often decreases with h…
View article: 3D Simulations Demonstrate Propagating Thermohaline Convection for Polluted White Dwarfs
3D Simulations Demonstrate Propagating Thermohaline Convection for Polluted White Dwarfs Open
Polluted white dwarfs (WDs) with small surface convection zones deposit significant concentrations of heavy elements to the underlying radiative interior, presumably driving thermohaline convection. Current models of polluted WDs frequentl…
View article: Multiple scales analysis of a nonlinear timestepping instability in simulations of solitons
Multiple scales analysis of a nonlinear timestepping instability in simulations of solitons Open
The susceptibility of timestepping algorithms to numerical instabilities is an important consideration when simulating partial differential equations (PDEs). Here we identify and analyze a pernicious numerical instability arising in pseudo…
View article: Evolution of Semiconvective Staircases in Rotating Flows: Consequences for Fuzzy Cores in Giant Planets
Evolution of Semiconvective Staircases in Rotating Flows: Consequences for Fuzzy Cores in Giant Planets Open
Recent observational constraints on the internal structure of Jupiter and Saturn suggest that these planets have “fuzzy” cores, i.e., gradients of the concentration of heavy elements that might span a large fraction of the planet’s radius.…
View article: Internally heated and fully compressible convection: Flow morphology and scaling laws
Internally heated and fully compressible convection: Flow morphology and scaling laws Open
In stars and planets natural processes heat convective flows in the bulk of a convective region rather than at hard boundaries. By characterizing how convective dynamics are determined by the strength of an internal heating source we can g…
View article: Modelling Time-dependent Convective Penetration in 1D Stellar Evolution
Modelling Time-dependent Convective Penetration in 1D Stellar Evolution Open
One-dimensional stellar evolution calculations produce uncertain predictions for quantities like the age, core mass, core compactness, and nucleosynthetic yields; a key source of uncertainty is the modeling of interfaces between regions th…
View article: Iterative Methods for Navier--Stokes Inverse Problems
Iterative Methods for Navier--Stokes Inverse Problems Open
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 challenges and applications. Direct Adjoint Looping (DAL) is t…
View article: Supplemental Materials for "Modelling time-dependent convective penetration in 1D stellar evolution"
Supplemental Materials for "Modelling time-dependent convective penetration in 1D stellar evolution" Open
MESA work/ directory, including inlists and run_star_extras, in addition to the data products and python scripts used to generate the figures for the paper: "Modelling time-dependent convective penetration in 1D stellar evolution". This wo…
View article: Internally heated and fully compressible convection: flow morphology and scaling laws
Internally heated and fully compressible convection: flow morphology and scaling laws Open
In stars and planets natural processes heat convective flows in the bulk of a convective region rather than at hard boundaries. By characterizing how convective dynamics are determined by the strength of an internal heating source we can g…
View article: Force balances in strong-field magnetoconvection simulations
Force balances in strong-field magnetoconvection simulations Open
We study force balances in two-dimensional Rayleigh-Benard simulations with a large range of imposed background magnetic fields. We find two main regimes, a magnetically constrained regime where the linear Lorentz force dominates, and a ma…
View article: The Puzzling Structure of Solar Convection: Window into the Dynamo
The Puzzling Structure of Solar Convection: Window into the Dynamo Open
Whitepaper #105 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: solar physics; research tools and infrastructure.
View article: The photometric variability of massive stars due to gravity waves excited by core convection
The photometric variability of massive stars due to gravity waves excited by core convection Open
Massive stars die in catastrophic explosions that seed the interstellar medium with heavy elements and produce neutron stars and black holes. Predictions of the explosion’s character and the remnant mass depend on models of the star’s evol…
View article: Nonlinear mode coupling and energetics of driven magnetized shear-flow turbulence
Nonlinear mode coupling and energetics of driven magnetized shear-flow turbulence Open
To comprehensively understand saturation of two-dimensional ($2$D) magnetized Kelvin-Helmholtz-instability-driven turbulence, energy transfer analysis is extended from the traditional interaction between scales to include eigenmode interac…
View article: Nonlinear mode coupling and energetics of driven magnetized shear-flow turbulence
Nonlinear mode coupling and energetics of driven magnetized shear-flow turbulence Open
To comprehensively understand the saturation of two-dimensional (2D) magnetized Kelvin–Helmholtz-instability-driven turbulence, energy transfer analysis is extended from the traditional interaction between scales to include eigenmode inter…
View article: The photometric variability of massive stars due to gravity waves excited by core convection
The photometric variability of massive stars due to gravity waves excited by core convection Open
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 character and the remnant mass depend on models of the star's ev…
View article: Rotation Reduces Convective Mixing in Jupiter and Other Gas Giants
Rotation Reduces Convective Mixing in Jupiter and Other Gas Giants Open
Recent measurements of Jupiter’s gravitational moments by the Juno spacecraft and seismology of Saturn’s rings suggest that the primordial composition gradients in the deep interior of these planets have persisted since their formation. On…
View article: Heat Transport and Convective Velocities in Compositionally Driven Convection in Neutron Star and White Dwarf Interiors
Heat Transport and Convective Velocities in Compositionally Driven Convection in Neutron Star and White Dwarf Interiors Open
We investigate heat transport associated with compositionally driven convection driven by crystallization at the ocean–crust interface in accreting neutron stars, or growth of the solid core in cooling white dwarfs. We study the effect of …
View article: Rotation reduces convective mixing in Jupiter and other gas giants
Rotation reduces convective mixing in Jupiter and other gas giants Open
Recent measurements of Jupiter's gravitational moments by the Juno spacecraft and seismology of Saturn's rings suggest that the primordial composition gradients in the deep interior of these planets have persisted since their formation. On…
View article: Convective Boundary Mixing in Main-Sequence Stars: Theory and Empirical Constraints
Convective Boundary Mixing in Main-Sequence Stars: Theory and Empirical Constraints Open
The convective envelopes of solar-type stars and the convective cores of intermediate- and high-mass stars share boundaries with stable radiative zones. Through a host of processes we collectively refer to as “convective boundary mixing” (…
View article: Code, Data, and Supplemental Materials for "The photometric variability of massive stars due to gravity waves excited by core convection"
Code, Data, and Supplemental Materials for "The photometric variability of massive stars due to gravity waves excited by core convection" Open
This repository backs up the code, data, and supplemental materials required to reproduce the analyses and figures in "The photometric variability of massive stars due to gravity waves excited by core convection" (Anders et al. 2023). In t…
View article: Code, Data, and Supplemental Materials for "The photometric variability of massive stars due to gravity waves excited by core convection"
Code, Data, and Supplemental Materials for "The photometric variability of massive stars due to gravity waves excited by core convection" Open
This repository backs up the code, data, and supplemental materials required to reproduce the analyses and figures in "The photometric variability of massive stars due to gravity waves excited by core convection" (Anders et al. 2023). In t…
View article: Convective boundary mixing in main-sequence stars: theory and empirical constraints
Convective boundary mixing in main-sequence stars: theory and empirical constraints Open
The convective envelopes of solar-type stars and the convective cores of intermediate- and high-mass stars share boundaries with stable radiative zones. Through a host of processes we collectively refer to as "convective boundary mixing" (…
View article: Supplemental Materials for "Convective boundary mixing in main-sequence stars: theory and empirical constraints"
Supplemental Materials for "Convective boundary mixing in main-sequence stars: theory and empirical constraints" Open
MESA inlists and data products used for generating the figures of the review paper: "Convective boundary mixing in main-sequence stars: theory and empirical constraints".
View article: Supplemental Materials for "Convective boundary mixing in main-sequence stars: theory and empirical constraints"
Supplemental Materials for "Convective boundary mixing in main-sequence stars: theory and empirical constraints" Open
MESA inlists and data products used for generating the figures of the review paper: "Convective boundary mixing in main-sequence stars: theory and empirical constraints".
View article: Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors
Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors Open
MESA (version r22.11.1) inlists and source code used for the paper "Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors". cool_wd.zip contains the MESA files to reproduce …
View article: Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors
Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors Open
MESA (version r22.11.1) inlists and source code used for the paper "Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors". cool_wd.zip contains the MESA files to reproduce …