John B. Bell
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View article: Molecular fluctuations inhibit intermittency in compressible turbulence
Molecular fluctuations inhibit intermittency in compressible turbulence Open
In the standard picture of fully developed turbulence, highly intermittent hydrodynamic fields are nonlinearly coupled across scales, where local energy cascades from large scales into dissipative vortices and large density gradients. Micr…
View article: High Proper Motion Discoveries from the UKIRT Hemisphere Survey
High Proper Motion Discoveries from the UKIRT Hemisphere Survey Open
We used the third data release of the UKIRT Hemisphere Survey to locate previously unrecognized high proper motion objects. We identify a total of 127 new discoveries with total proper motions ≳300 mas yr −1 . A significant fraction of the…
View article: Comment on "Physical significance of artificial numerical noise in direct numerical simulation of turbulence"
Comment on "Physical significance of artificial numerical noise in direct numerical simulation of turbulence" Open
Recently, Liao and Qin [J. Fluid Mech. 1008, R2 (2025)] claimed that numerical noise in direct numerical simulation of turbulence using the deterministic Navier-Stokes equations is "approximately equivalent" to the physical noise arising f…
View article: High Proper Motion Discoveries from the UKIRT Hemisphere Survey
High Proper Motion Discoveries from the UKIRT Hemisphere Survey Open
We used the third data release of the UKIRT Hemisphere Survey to locate previously unrecognized high proper motion objects. We identify a total of 127 new discoveries with total proper motions $\gtrsim$300 mas yr$^{-1}$. A significant frac…
View article: Visualization of Hemispherical Post‐Detonation Fireball Internal Structures
Visualization of Hemispherical Post‐Detonation Fireball Internal Structures Open
Hemispherical charges are initiated above a transparent plate in a half‐plane configuration, allowing optical access to the internal regions of the luminous fireball. High‐speed visualization enables characterization of the internal lumino…
View article: Comment on “Brownian motion of droplets induced by thermal noise”
Comment on “Brownian motion of droplets induced by thermal noise” Open
We simulate phase separated fluids using the Cahn-Hillard fluctuating hydrodynamic (CH-FHD) model and measure the statistical properties of capillary waves generated by thermal fluctuations. Our measurements are in good agreement with stoc…
View article: Thermodynamic consistency and fluctuations in mesoscopic stochastic simulations of reactive gas mixtures
Thermodynamic consistency and fluctuations in mesoscopic stochastic simulations of reactive gas mixtures Open
It is essential that mesoscopic simulations of reactive systems reproduce the correct statistical distributions at thermodynamic equilibrium. By considering a compressible fluctuating hydrodynamics (FHD) simulation method of ideal gas mixt…
View article: Spherical and sessile droplet dynamics by fluctuating hydrodynamics
Spherical and sessile droplet dynamics by fluctuating hydrodynamics Open
We simulate the mesoscopic dynamics of droplets formed by phase-separated fluids at nanometer scales where thermal fluctuations are significant. Both spherical droplets fully immersed in a second fluid and sessile droplets which are also i…
View article: Thermodynamic consistency and fluctuations in mesoscopic stochastic simulations of reactive gas mixtures
Thermodynamic consistency and fluctuations in mesoscopic stochastic simulations of reactive gas mixtures Open
It is essential that mesoscopic simulations of reactive systems reproduce the correct statistical distributions at thermodynamic equilibrium. By considering a compressible fluctuating hydrodynamics (FHD) simulation method of ideal gas mixt…
View article: A Study of Spherical and Sessile Droplet Dynamics by Fluctuating Hydrodynamics
A Study of Spherical and Sessile Droplet Dynamics by Fluctuating Hydrodynamics Open
We simulate the mesoscopic dynamics of droplets formed by phase separated fluids at nanometer scales where thermal fluctuations are significant. Both spherical droplets fully immersed in a second fluid and sessile droplets which are also i…
View article: Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques
Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques Open
We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET , applied to time-series images from the Wide-field Infrared Survey Explorer. We gathered photometric and astrometric…
View article: AMReX and pyAMReX: Looking beyond the exascale computing project
AMReX and pyAMReX: Looking beyond the exascale computing project Open
AMReX is a software framework for the development of block-structured mesh applications with adaptive mesh refinement (AMR). AMReX was initially developed and supported by the AMReX Co-Design Center as part of the U.S. DOE Exascale Computi…
View article: Discovery of 118 New Ultracool Dwarf Candidates Using Machine Learning Techniques
Discovery of 118 New Ultracool Dwarf Candidates Using Machine Learning Techniques Open
We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine learning tool, named \texttt{SMDET}, applied to time series images from the Wide-field Infrared Survey Explorer. We gathered photometric and ast…
View article: An Introduction to Computational Fluctuating Hydrodynamics
An Introduction to Computational Fluctuating Hydrodynamics Open
These notes are an introduction to fluctuating hydrodynamics (FHD) and the formulation of numerical schemes for the resulting stochastic partial differential equations (PDEs). Fluctuating hydrodynamics was originally introduced by Landau a…
View article: Comment on "Brownian motion of droplets induced by thermal noise"
Comment on "Brownian motion of droplets induced by thermal noise" Open
We simulate phase separated fluids using the Cahn-Hillard fluctuating hydrodynamic (CH-FHD) model and measure the statistical properties of capillary waves generated by thermal fluctuations. Our measurements are in good agreement with stoc…
View article: THE SIMULATION OF SIDE SCAN SONAR IMAGES USING RAY TRACING TECHNIQUES
THE SIMULATION OF SIDE SCAN SONAR IMAGES USING RAY TRACING TECHNIQUES Open
Recent progress in computer graphics has produced techniques which create extremely realistic images by modelling the behaviour of light as it interacts With the objects in a scene.This paper presents some initial attempts at using the lig…
View article: AMReX and pyAMReX: Looking Beyond ECP
AMReX and pyAMReX: Looking Beyond ECP Open
AMReX is a software framework for the development of block-structured mesh applications with adaptive mesh refinement (AMR). AMReX was initially developed and supported by the AMReX Co-Design Center as part of the U.S. DOE Exascale Computi…
View article: The Pele Simulation Suite for Reacting Flows at Exascale
The Pele Simulation Suite for Reacting Flows at Exascale Open
In this work, we present the Pele suite of software tools for compressible and incompressible reacting flows. The Pele suite leverages several different libraries, notably AMReX and SUNDIALS, to achieve performance portability on heterogen…
View article: AMReX v2024
AMReX v2024 Open
The software framework, AMReX, supports the development of block-structured adaptive mesh refinement (AMR) algorithms for solving systems of partial differential equations. AMR reduces the computational cost and memory footprint compared t…
View article: MODELLING OF HIGH FREQUENCY SONAR SYSTEMS
MODELLING OF HIGH FREQUENCY SONAR SYSTEMS Open
High frequency imaging sonars produce a representation in image, or signal, form of the seabed.However, no closed form analytic expression or direct modelling technique exists to represent this complex process.This paper presents a summary…
View article: PeleLMeX: an AMR Low Mach Number Reactive FlowSimulation Code without level sub-cycling
PeleLMeX: an AMR Low Mach Number Reactive FlowSimulation Code without level sub-cycling Open
PeleLMeX simulates chemically reacting low Mach number flows with block-structured adaptive mesh refinement (AMR). The code is built upon the AMReX library, which provides the underlying data structures and tools to manage and operate on t…
View article: Surface coverage dynamics for reversible dissociative adsorption on finite linear lattices
Surface coverage dynamics for reversible dissociative adsorption on finite linear lattices Open
Dissociative adsorption onto a surface introduces dynamic correlations between neighboring sites not found in non-dissociative absorption. We study surface coverage dynamics where reversible dissociative adsorption of dimers occurs on a fi…
View article: Data for WarpX Milestone ECP-ADSE06.FY23.2: Progress towards the full exascale challenge problem
Data for WarpX Milestone ECP-ADSE06.FY23.2: Progress towards the full exascale challenge problem Open
Artifact Description See https://zenodo.org/record/7790160 (and update). Milestone data for year 7, milestone 2 (WBS 2.2.2.6, Milestone ECP-ADSE06.FY23.2).
View article: Data for WarpX Milestone ECP-ADSE06.FY23.2: Progress towards the full exascale challenge problem
Data for WarpX Milestone ECP-ADSE06.FY23.2: Progress towards the full exascale challenge problem Open
Artifact Description See https://zenodo.org/record/7790160 (and update). Milestone data for year 7, milestone 2 (WBS 2.2.2.6, Milestone ECP-ADSE06.FY23.2).
View article: A New Re-redistribution Scheme for Weighted State Redistribution with Adaptive Mesh Refinement
A New Re-redistribution Scheme for Weighted State Redistribution with Adaptive Mesh Refinement Open
State redistribution (SRD) is a recently developed technique for stabilizing cut cells that result from finite-volume embedded boundary methods. SRD has been successfully applied to a variety of compressible and incompressible flow problem…
View article: Fluctuating hydrodynamics and the Rayleigh–Plateau instability
Fluctuating hydrodynamics and the Rayleigh–Plateau instability Open
The Rayleigh–Plateau instability occurs when surface tension makes a fluid column become unstable to small perturbations. At nanometer scales, thermal fluctuations are comparable to interfacial energy densities. Consequently, at these scal…
View article: Steric effects in induced-charge electro-osmosis for strong electric fields
Steric effects in induced-charge electro-osmosis for strong electric fields Open
We study the role of steric effects on the induced-charge electro-osmosis (ICEO) phenomenon using a recently developed mesoscale fluid model. A hybrid Eulerian-Lagrangian method is used to simulate the dynamics of discrete immersed ions in…
View article: Fluctuating Hydrodynamics and the Rayleigh-Plateau Instability
Fluctuating Hydrodynamics and the Rayleigh-Plateau Instability Open
The Rayleigh-Plateau instability occurs when surface tension makes a fluid column become unstable to small perturbations. At nanometer scales, thermal fluctuations are comparable to surface energy densities. Consequently, at these scales, …