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Record W2065620194 · doi:10.3137/ao.420105

Mechanism and large eddy simulation of dust devils

2004· article· en· W2065620194 on OpenAlex

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

venuePublished in a venue whose home country is Canada.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
No Canadian affiliation. An affiliation-only frame, the usual design, would never have seen this work. It is one of the works that make the case for inverting the frame.

Bibliographic record

VenueATMOSPHERE-OCEAN · 2004
Typearticle
Languageen
FieldEarth and Planetary Sciences
TopicAeolian processes and effects
Canadian institutionsnot available
Fundersnot available
KeywordsVortexWhirlwindBuoyancyLarge eddy simulationOutflowConvectionMechanicsPhysicsGeologyMeteorologyInflowAtmospheric sciencesTurbulence

Abstract

fetched live from OpenAlex

Abstract Large Eddy Simulations (LES) of vertical convective vortices and dust devils in the terrestrial Convective Boundary Layer (CBL) are presented. A CBL‐scale simulation and a dust‐devil‐scale simulation are preformed at different resolutions. The CBL‐scale simulation is performed to study the generation of vertical vortices and the dust‐devil‐scale simulation is performed to study the detailed structures and stages of dust devil development. The simulation results show that dust devils undergo three stages of development as the swirl ratio increases: a weak vortex stage, a single‐celled vortex stage and a two‐celled vortex stage. The structure of a dust devil can be divided into four regions: outflow, core, corner and inflow layer. The different structures and characteristics of the modelled dust devil during various stages of development and the influence of the surface on the dust devil profile are described using some of the simulation results as illustrations. The causes of the different structures and characteristics are analysed through the interplay between the rotation, the radial pressure gradient, the buoyancy and the axial pressure gradient. Dust devils are a type of concentrated vortex similar to tornadoes. The differences in the structure and characteristics of tornadoes and the modelled dust devils are discussed in this paper. The carrying aloft of sand particles within the modelled dust devil is explored using a Lagrangian coordinate system. Sand particles can be transported by the updraft with particles of varying diameters follow different tracks. Résumé [traduit par la rédaction] On présente des simulations de grands tourbillons de turbulence (SGT) pour les tourbillons convectifs verticaux et les tourbillons de sable dans la couche limite de convection de la Terre (CLC). On fait une simulation à l'échelle de la CLC et une autre à l'échelle des tourbillons de sable à différentes résolutions. La simulation à l'échelle de la CLC vise à étudier la façon dont les tourbillons verticaux se forment et la simulation à l'échelle des tourbillons de sable vise à étudier les structures fines et les phases de formation des tourbillons de sable. Les résultats des simulations montrent que les tourbillons de sable passent par trois phases de formation au fur et à mesure que le rapport de tourbillon augmente : une phase de tourbillon faible, une phase de tourbillon à cellule unique et une phase de tourbillon à deux cellules. La structure d'un tourbillon de sable peut être décrite en quatre régions : un courant sortant, un cœur, un coin et une couche de courant entrant. On décrit les différentes structures et caractéristiques du tourbillon de sable modélisé durant diverses phases de formation ainsi que l'influence de la surface sur le profil du tourbillon de sable en se servant de certains résultats des simulations en guise d'illustrations. Les causes des différentes structures et caractéristiques sont analysées en fonction de l'influence réciproque de la rotation, du gradient de pression radial, de la force de flottabilité et du gradient de pression axial. Les tourbillons de sable sont un type de tourbillon concentré, comme le sont les tornades. Dans cet article, on discute des différences entre la structure et les caractéristiques des tornades et celles des tourbillons de sable modélisés. On examine le transport en altitude des particules de sable dans le tourbillon de sable modélisé à l'aide d'un système de coordonnées lagrangiennes. Les particules de sable peuvent être transportées par le courant ascendant, les particules de différents diamètres empruntant différentes trajectoires. Notes Corresponding author's e‐mail: yongzhizhao@yahoo.com

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: Simulation or modeling
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.074
Threshold uncertainty score0.690

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.008
GPT teacher head0.215
Teacher spread0.207 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it