Parallel three-dimensional DSMC method using mesh refinement and variable time-step scheme

Wu, Jong‐Shinn; Tseng, Kuo-Hung; Wu, Fu Yuan

doi:10.1016/j.cpc.2004.07.004

Cited by 65 publications

(41 citation statements)

References 22 publications

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“…This code has been used previously to model the water vapor distribution in the vicinity of comet 9P/Tempel 1 (Finklenburg et al 2014). PDSC ++ (Su 2013) is based on the PDSC code developed by Wu and co-workers (Wu & Lian 2003;Wu & Tseng 2005;Wu et al 2004). PDSC ++ allows a simulation of 2D, 2D-axisymmetric, and 3D flows on hybrid unstructured grids.…”

Section: Influence Of Gas Dragmentioning

confidence: 99%

Redistribution of Particles Across the Nucleus of Comet 67p/Churyumov-Gerasimenko

Thomas¹,

Davidsson²,

El-Maarry³

et al. 2016

Geological Society of America Abstracts With Programs

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Context. We present an investigation of the surface properties of areas on the nucleus of comet 67P/Churyumov-Gerasimenko. Aims. We aim to show that transport of material from one part of the cometary nucleus to another is a significant mechanism that influences the appearance of the nucleus and the surface thermal properties. Methods. We used data from the OSIRIS imaging system onboard the Rosetta spacecraft to identify surface features on the nucleus that can be produced by various transport mechanisms. We used simple calculations based on previous works to establish the plausibility of dust transport from one part of the nucleus to another. Results. We show by observation and modeling that "airfall" as a consequence of non-escaping large particles emitted from the neck region of the nucleus is a plausible explanation for the smooth thin deposits in the northern hemisphere of the nucleus. The consequences are also discussed. We also present observations of aeolian ripples and ventifacts. We show by numerical modeling that a type of saltation is plausible even under the rarified gas densities seen at the surface of the nucleus. However, interparticle cohesive forces present difficulties for this model, and an alternative mechanism for the initiation of reptation and creep may result from the airfall mechanism. The requirements on gas density and other parameters of this alternative make it a more attractive explanation for the observations. The uncertainties and implications are discussed.

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Section: Influence Of Gas Dragmentioning

confidence: 99%

Redistribution of Particles Across the Nucleus of Comet 67p/Churyumov-Gerasimenko

Thomas¹,

Davidsson²,

El-Maarry³

et al. 2016

Geological Society of America Abstracts With Programs

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“…The DSMC code, PDSC++, is a general-purpose parallel 2D/2D-axisymmetric/3D DSMC code using unstructured grid, which is developed by Wu's group. Some important features of the PDSC++ include hybrid unstructured mesh, variable time-step scheme (Wu, Tseng & Wu 2004), transient adaptive sub-cell method (Su et al 2010), unsteady simulation (Cave et al 2008), domain redecomposition, automatic steady state detection scheme, parallel computing technique and chemical reaction based on total collision energy model (Lo et al 2015). It also has been applied to the rare gas flows of cometary comas (Finklenburg et al 2014;Lai et al 2016;Marschall et al 2016).…”

Section: The Solar Illumination Effectmentioning

confidence: 99%

Gas outflow and dust transport of comet 67P/Churyumov–Gerasimenko

Lai

et al. 2016

Monthly Notices of the Royal Astronomical Society

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“…To treat the transition from a collisional region close to the central nucleus to the collisionless coma at large distance, a direct simulation Monte Carlo (DSMC) method is required (Bird 1994). The basic structure of the DSMC code used for obtaining this result has been described in detail in Wu et al (2004), Su et al (2010), Lai et al (2015), and Liao et al (2016) and is not repeated here. For this simulation, we assumed that the water production rate is 10 27 molecules s −1 and the sunlit portion of the nucleus surface at the time of consideration was assumed to be all actively outgassing.…”

Section: Numerical Simulationmentioning

confidence: 99%

Observations and analysis of a curved jet in the coma of comet 67P/Churyumov-Gerasimenko

Lin

Lai

et al. 2016

A&A

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Aims. We analyze the physical properties and dynamical origin of a curved jet of comet 67P/Churyumov-Gerasimenko that was observed repeatedly in several nucleus rotations starting on May 30 and persisting until early August, 2015. Methods. We simulated the motion of dust grains ejected from the nucleus surface under the influence of the gravity and viscous drag effect of the expanding gas flow from the rotating nucleus. Results. The formation of the curved jet is a combination of the size of the dust particles (∼0.1−1 mm) and the location of the source region near the nucleus equator. This enhances the spiral feature of the collimated dust stream after the dust is accelerated to a terminal speed on the order of m s −1 .

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Parallel three-dimensional DSMC method using mesh refinement and variable time-step scheme

Cited by 65 publications

References 22 publications

Redistribution of Particles Across the Nucleus of Comet 67p/Churyumov-Gerasimenko

Redistribution of Particles Across the Nucleus of Comet 67p/Churyumov-Gerasimenko

Gas outflow and dust transport of comet 67P/Churyumov–Gerasimenko

Observations and analysis of a curved jet in the coma of comet 67P/Churyumov-Gerasimenko

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