Results 61 to 70 of about 6,525,998 (141)

Data-driven nonlinear constitutive relations for rarefied flow computations

Advances in Aerodynamics, 2021
To overcome the defects of traditional rarefied numerical methods such as the Direct Simulation Monte Carlo (DSMC) method and unified Boltzmann equation schemes and extend the covering range of macroscopic equations in high Knudsen number flows, data ...
Wenwen Zhao, Lijian Jiang, Shaobo Yao, Weifang Chen   +3 more
doaj   +1 more source

The Impacts of Thermospheric Circulation and Exospheric Transport on the Coupled System

Journal of Geophysical Research: Space Physics, Volume 129, Issue 12, December 2024.
Abstract The boundary between the thermosphere and exosphere is often given the simplified description of being a separation between highly collisional continuum mechanics and a collisionless domain. The realistic smooth transition through this space has historically presented a challenge to model as the assumptions used to simplify the Boltzmann ...
S. E. Luettgen, E. K. Sutton, J. P. Thayer   +2 more
wiley   +1 more source

The Neutral Water Torus of Europa

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract The neutral particles that escape Europa form a neutral torus which asymmetrically encircles the giant planet Jupiter. The study of this structure can inform on neutral escape at the icy moon and on the loading of the Jovian magnetosphere with Europan material.
Q. Nénon, F. Leblanc
wiley   +1 more source

Multiple temperature model of nonlinear coupled constitutive relations for hypersonic diatomic gas flows

AIP Advances, 2020
The rotational energy of diatomic gases would be activated by the process of intermolecular collisions in high-temperature hypersonic flows. In this paper, a multi-temperature nonlinear coupled constitutive model has been proposed for simulating the ...
Zhenyu Yuan, Zhongzheng Jiang, Wenwen Zhao, Weifang Chen   +3 more
doaj   +1 more source

The Influence of Non‐Thermal Collisions in Europa's Atmosphere

Geophysical Research Letters, Volume 51, Issue 20, 28 October 2024.
Abstract In this study, we show that non‐thermal collisions can play a significant role in shaping Europa's exospheric structure. Collisions between radiolytically produced O2 ${\mathrm{O}}_{2}$ and the O produced via electron impact dissociation of O2 ${\mathrm{O}}_{2}$ affect the exospheric structure and escape rates. Specifically, O + O2 ${\mathrm{O}
Shane R. Carberry Mogan, Andrew R. Poppe, Lucas Liuzzo   +2 more
wiley   +1 more source

Improved sampling techniques for the direct simulation Monte Carlo method

, 2009
The direct simulation Monte Carlo (DSMC) method is a widely used approach for flow simulations having rarefied or nonequilibrium effects. It involves heavily to sample instantaneous values from prescribed distributions using random numbers. In this note,
孙泉华, 樊菁, Boyd ID
core   +1 more source

Aerodynamic Analysis of Deorbit Drag Sail for CubeSat Using DSMC Method

Aerospace
Reducing space debris is a critical challenge in current space exploration. This study focuses on designing a drag sail for CubeSat models and examining their aerodynamic properties using the direct simulation Monte Carlo (DSMC) method.
Jiaheng Chen, Song Chen, Yuhang Qin, Zeyu Zhu, Jun Zhang   +4 more
doaj   +1 more source

Generation and Applications of a Broad Atomic Oxygen Beam with a High Flux‐Density via Collision‐Induced Dissociation of O2

Chinese Journal of Chemistry, Volume 42, Issue 17, Page 2010-2016, 1 September 2024.
The report presented a method for generating a broad atomic oxygen (AO) beam with high flux‐density. The feasibility of the method was verified through theoretical simulations. The device successfully generated high flux‐density AO, which can facilitate the surface oxidation of materials.
Zhiqiang Han, Liying Song, Po‐Wan Shum, Woon‐Ming Lau   +3 more
wiley   +1 more source

Anisotropic continuum framework of coupled gas flow – adsorption – deformation in sedimentary rocks

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 48, Issue 4, Page 1018-1045, March 2024.
Abstract Solid deformation is always a crucial factor of gas transport in sedimentary rocks. While previous studies always adopt the assumption of isotropic poroelastic deformation, anisotropic poroelastoplastic deformation is rarely considered, despite anisotropy being a ubiquitous property of natural sedimentary rocks.
Qi Zhang, Zhen‐Yu Yin, Xia Yan
wiley   +1 more source

Analysis of Flow Fields in a Deposition Chamber by a Molecular Approach [PDF]

, 2010
In this Ph.D Thesis a computing procedure is proposed as possible tool to simulate and analyze the flow field in a thin film deposition apparatus similar to the van de Sanden deposition apparatus at the University of Eindhoven.
Romano, Francesco
core   +1 more source