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The mesoscale structure of aeolian sand transport determines a variety of natural phenomena studied in planetary and Earth science. We analyze it theoretically beyond the mean-field level, based on the grain-scale transport kinetics and…

Soft Condensed Matter · Physics 2017-12-06 Marc Lämmel , Klaus Kroy

To analyze theoretically the stability of the shape and the migration process of transverse dunes and barchans, we propose a {\it skeleton model} of 3D dunes described with coupled dynamics of 2D cross-sections. First, 2D cross-sections of…

Pattern Formation and Solitons · Physics 2012-01-05 Hirofumi Niiya , Akinori Awazu , Hiraku Nishimori

Planets have been detected around a variety of stars, including low-mass objects, such as brown dwarfs. However, such extreme cases are challenging for planet formation models. Recent sub-millimeter observations of disks around brown dwarf…

Earth and Planetary Astrophysics · Physics 2013-05-20 P. Pinilla , T. Birnstiel , M. Benisty , L. Ricci , A. Natta , C. P. Dullemond , C. Dominik , L. Testi

Stellar-feedback driven outflows are predicted to play a fundamental role in the baryon cycle of low-mass galaxies. However, observational constraints of winds in nearby dwarf galaxies are limited as outflows are transient, intrinsically…

Astrophysics of Galaxies · Physics 2020-06-24 Kristen B. W. McQuinn , Liese van Zee , Evan D. Skillman

Uranus and Neptune exhibit fast surface zonal winds that can reach up to few hundred meters per second. Previous studies on zonal gravitational harmonics and Ohmic dissipation constraints suggest that the wind speeds diminish rapidly in…

Earth and Planetary Astrophysics · Physics 2023-01-04 Deniz Soyuer , Benno Neuenschwander , Ravit Helled

We present nested-grid, high-resolution hydrodynamic simulations of gas and particle dynamics in the vicinity of Mars- to Earth-mass planetary embryos. The simulations extend from the surface of the embryos to a few vertical disk scale…

Earth and Planetary Astrophysics · Physics 2018-07-31 A. Popovas , Å. Nordlund , Jon P. Ramsey , Chris W. Ormel

We analyse the size evolution of pebbles accreted into the gaseous envelope of a protoplanet growing in a protoplanetary disc, taking into account collisions driven by the relative sedimentation speed as well as the convective gas motion.…

Earth and Planetary Astrophysics · Physics 2020-11-18 Anders Johansen , Åke Nordlund

We present in this paper a simplification of the dune model proposed by Sauermann et al. which keeps the basic mechanisms but allows analytical and parametric studies. Two kinds of purely propagative two dimensional solutions are exhibited:…

Condensed Matter · Physics 2015-06-24 Bruno Andreotti , Philippe Claudin

We use the Mars Regional Atmospheric Modeling System (MRAMS) to simulate lake storms on Mars, finding that intense localized precipitation will occur for lake size >=10^3 km^2. Mars has a low-density atmosphere, so deep convection can be…

Earth and Planetary Astrophysics · Physics 2011-07-28 Edwin S. Kite , Timothy I. Michaels , Scot Rafkin , Michael Manga , William E. Dietrich

The observed temporary dark streaks on some dune slopes on Mars may be due to thin sheets of water (or some other liquid) trickling downhill. This note corrects conceptual errors in a previous paper (M\"{o}hlmann and Kereszturi 2010, Icarus…

Earth and Planetary Astrophysics · Physics 2015-06-19 Anthony R. Dobrovolskis

We model the gas and dust dynamics in a turbulent protoplanetary disc undergoing extreme-UV photoevaporation in order to better characterise the dust properties in thermal winds (e.g. size distribution, flux rate, trajectories). Our…

Earth and Planetary Astrophysics · Physics 2020-12-02 Mark A. Hutchison , Cathie J. Clarke

The heavy mass loss observed in evolved asymptotic giant branch (AGB) stars is usually attributed to a two-stage process: atmospheric levitation by pulsation-induced shock waves, followed by radiative acceleration of newly formed dust…

Solar and Stellar Astrophysics · Physics 2015-06-15 Sara Bladh , Susanne Höfner , Walter Nowotny , Bernhard Aringer

Our aim in this note is to introduce and study a mathematical model for the description of traveling sand dunes. We use surface flow process of sand under the effect of wind and gravity. We model this phenomena by a non linear…

Analysis of PDEs · Mathematics 2021-03-23 Noureddine Igbida , Fahd Karami , Driss Meskine

The Ku-band (13.8 GHz - 2.2 cm) RADAR instrument onboard the Cassini-Huygens spacecraft has revealed the richness of the surface of Titan, as numerous seas, lakes, rivers, cryo-volcanic flows and vast dune fields have been discovered.…

Earth and Planetary Astrophysics · Physics 2015-09-15 Philippe Paillou , Benoît Seignovert , Jani Radebaugh , Stephen Wall

Vegetation is the most common and most reliable stabilizer of loose soil or sand. This ancient technique is for the first time cast into a set of equations of motion describing the competition between aeolian sand transport and vegetation…

Other Condensed Matter · Physics 2009-11-11 Orencio Duran , Hans J. Herrmann

The major satellites of Jupiter and Saturn are believed to have formed in circumplanetary discs, which orbit forming giant protoplanets. Gas and dust in CPDs have different distributions and affect each other by drag, which varies with…

Earth and Planetary Astrophysics · Physics 2023-01-25 Samuel M. Karlin , Olja Panić , Sven van Loo

Spatiotemporal patterns in nature, such as ripples or dunes, formed by a fluid streaming over a sandy surface show complex behavior despite their simple forms. Below the surface, the granular structure of the sand particles is subject to…

Soft Condensed Matter · Physics 2015-05-30 Christopher Groh , Ingo Rehberg , Christof A. Kruelle

We have computed wind models with time-dependent dust formation and grain-size dependent opacities, where (1) the problem is simplified by assuming a fixed dust-grain size, and where (2) the radiation pressure efficiency is approximated…

Solar and Stellar Astrophysics · Physics 2010-10-04 Lars Mattsson , Susanne Höfner

Collisional charging is one potential initial step in generating lightning. In this work, we study the charging of colliding monodisperse, spherical basalt grains depending on ambient pressure. We used grains of 1.0 to 1.2 mm in one set and…

Earth and Planetary Astrophysics · Physics 2019-05-28 Gerhard Wurm , Lars Schmidt , Tobias Steinpilz , Lucia Boden , Jens Teiser

Sand fences are widely applied to prevent soil erosion by wind in areas affected by desertification. Sand fences also provide a way to reduce the emission rate of dust particles, which is triggered mainly by the impacts of wind-blown sand…

Computational Physics · Physics 2017-02-20 Izael A. Lima , Ascânio D. Araújo , Eric J. R. Parteli , José S. Andrade , Hans J. Herrmann
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