Filters








732 Hits in 7.8 sec

To overcome memory barrier of kinetic solvers for non-equilibrium flow study

Kun Xu
2017 Science Bulletin  
The dominant numerical method for rarefied gas flow, especially for the high speed one, is the Direct Simulation Monte Carlo (DSMC) method [1].  ...  More specifically, the DSMC simulates the gas dynamics in small scales, such as time step Dt and cell size Dx being less than the particle collision time s  ...  This is a significant step for kinetic equation solver and for the simulation of rarefied flow.  ... 
doi:10.1016/j.scib.2016.12.005 fatcat:tulyiuojgba4nmoveicpcionte

An object-oriented serial implementation of a DSMC simulation package

Hongli Liu, Chunper Cai, Chun Zou
2012 Computers & Fluids  
This paper reports a scalar implementation of a multi-dimensional direct simulation Monte Carlo (DSMC) package named "Generalized Rarefied gAs Simulation Package" (GRASP).  ...  To reduce engineering time for three-dimensional simulations, one effective implementation is to adopt a hybrid grid scheme with a flexible data structure, which can automatically treat cubic cells adjacent  ...  The DSMC method is widely adopted for rarefied gas or plasma flow simulations.  ... 
doi:10.1016/j.compfluid.2011.12.007 fatcat:zldmf7s6c5f4vpvkdjrb6gnc34

Subject Index

1994 Journal of Spacecraft and Rockets  
and MHD Multibody-Plasma Interactions: Charging in the Wake A94-134 Rarefied Flows Simulated Rarefied Aerodynamics of the Magel- lan Spacecraft During Aerobraking A94-153 Zonally Decoupled Direct Simulation  ...  Flows About Blunt-Nosed Bodies A94-093 Approximate Method for Calculating Heating Rates on Three-Dimensional Vehicles A94-052 Cryogenics Method of Filling Screen Liquid Acquisition De- vices in Low Gravity  ... 
doi:10.2514/3.55674 fatcat:gdljoexs4jcdzmao3nwlmw3qvm

Numerical Simulation of the Chemical Combination and Dissociation Reactions of Neutral Particles in a Rarefied Plasma Arc Jet

Jie Li, Derek Ingham, Lin Ma, Ning Wang, Mohamed Pourkashanian
2017 IEEE Transactions on Plasma Science  
A three-dimensional unsteady investigation of neutral particles in a rarefied flow with chemical combination and dissociation reactions is numerically simulated based on an in-house direct simulation Monte  ...  In order to study the expansion of the neutral particles in an electric field, an electrostatic particle-in-cell (PIC) and DSMC are combined to simulate the axisymmetric rarefied plasma flows with chemical  ...  The main numerical simulation DSMC/PIC method is currently used to solve such plasma transport problems in a rarefied environment [2] , [3] , [6] - [8] , [10] - [12] .  ... 
doi:10.1109/tps.2017.2659735 fatcat:rzvqklxgu5fkzhfv7ks4puaqzu

Unified Gas-kinetic Wave-Particle Methods II: Multiscale Simulation on Unstructured Mesh [article]

Yajun Zhu and Chang Liu and Chengwen Zhong and Kun Xu
2019 arXiv   pre-print
In this paper, we present a unified gas-kinetic wave-particle (UGKWP) method on unstructured mesh for multiscale simulation of continuum and rarefied flow.  ...  In the rarefied flow regime, the flow physics is mainly recovered by the discrete particles and the UGKWP method performs as a stochastic particle method.  ...  particle methods obtain very high efficiency for simulation of high-speed rarefied flows in three dimensional case.  ... 
arXiv:1903.11861v1 fatcat:r7zkbgu4org6zep6c7bi35ybqe

GKS and UGKS for High-Speed Flows

Yajun Zhu, Chengwen Zhong, Kun Xu
2021 Aerospace (Basel)  
The accumulating effect of particles' collision during transport process within a time step is used in the construction of the schemes, and the intrinsic simulating flow physics in the schemes depends  ...  The gas-kinetic scheme (GKS) and the unified gas-kinetic scheme (UGKS) are numerical methods based on the gas-kinetic theory, which have been widely used in the numerical simulations of high-speed and  ...  The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.  ... 
doi:10.3390/aerospace8050141 fatcat:lcxir6r2j5fqhfgktq6oxazil4

Comparison of coupling techniques in a high-order discontinuous Galerkin-based particle-in-cell solver

T Stindl, J Neudorfer, A Stock, M Auweter-Kurtz, C-D Munz, S Roller, R Schneider
2011 Journal of Physics D: Applied Physics  
To solve these equations for complex-shaped domains, a fully electromagnetic Particle-In-Cell (PIC) code has been developed using high-order discontinuous Galerkin methods for the Maxwell equations on  ...  Highly rarefied plasma flows in technical devices are physically modeled by the Maxwell-Lorentz equations.  ...  Acknowledgements We gratefully acknowledge the Deutsche Forschungsgemeinschaft (DFG) for funding this research within the project "Numerical Modeling and Simulation of Highly Rarefied Plasma Flows".  ... 
doi:10.1088/0022-3727/44/19/194004 fatcat:4jzcekyxfja3nge4gu4qxzfanq

Particle Methods for Nonequilibrium Hypersonic and Plasma Flows

D. Bruno, A. Panarese, P. Diomede, S. Longo, F. Taccogna, P. Minelli, S.T. Surzhikov, A.S. Dikaljuk, P. De Palma, M.D. de Tullio
2014 The Open Plasma Physics Journal  
A Monte Carlo method is described for the study of species separation on shock wave fronts; a Particle in Cell with Monte Carlo Collisions (PIC/MCC) technique is described for the simulation of dust in  ...  plasma flows; modelling of nonequilibrium radiation in shock heated gases; implementation of slip models for the description of separation zones occurring in shockboudary layer interactions. © Bruno et  ...  In section 3, a Particle-in-Cell (PIC) technique is described for the simulation of dust grains inside a plasma.  ... 
doi:10.2174/1876534301407010088 fatcat:rjejhstsyrdxzhvwifw4lblvdm

Unified gas-kinetic wave-particle methods IV: multi-species gas mixture and plasma transport

Chang Liu, Kun Xu
2021 Advances in Aerodynamics  
For plasma transport, the current scheme provides a smooth transition from particle-in-cell (PIC) method in the rarefied regime to the magnetohydrodynamic solver in the continuum regime.  ...  In the continuum limit, the cell size and time step of the UGKWP method are not restricted by the particle mean free path and mean collision time.  ...  Compared to the discrete velocity method (DVM), the UGKWP is much effi- cient in the numerical simulation of highly non-equilibrium and high-dimensional flow problems, especially for the high speed flows  ... 
doi:10.1186/s42774-021-00062-1 fatcat:smr4yaqe6zdpxlf3hjgg5wtbbi

DSMC modeling of rarefied ionization reactions and applications to hypervelocity spacecraft reentry flows

Ming Fang, Zhi-Hui Li, Zhong-Hua Li, Jie Liang, Yong-Hao Zhang
2020 Advances in Aerodynamics  
The DSMC modeling is developed to simulate three-dimensional (3D) rarefied ionization flows and numerically forecast the communication blackout around spacecraft during hypervelocity reentry.  ...  The resulting DSMC method is highly efficient in simulating weakly inhomogeneous flows including the Couette shear flow and controlling statistical fluctuation with high resolution.  ...  Currently, the most widely used method for rarefied hypersonic flows is the Direct Simulation Monte Carlo (DSMC) [32] [33] [34] method.  ... 
doi:10.1186/s42774-020-00030-1 fatcat:3lozlrxijfhojl233cccziq3ta

Gas flow in a permeable medium

L. M. DE SOCIO, L. MARINO
2006 Journal of Fluid Mechanics  
An accurate prediction of heat fluxes on space vehicles in the Martian CO2 atmosphere requires improvement of Fig. 2: (a) Variations of non-dimensional density, temperature and pressure along the axial  ...  direction of the simulated system for Kn = 1; (b) Density evolutions in time in the cold and hot reservoirs for Kn = 1, with the MD data fitted to exponential and PL curves.  ...  In order to simulate this flow, we use the direct simulation Monte Carlo (DSMC) method [5] .  ... 
doi:10.1017/s0022112006009621 fatcat:kvzjpy276rektja43dydmleeb4

Numerical Simulations of Gas Cloud Expansion in Rarefied Environment

Virendra K. Dogra
2005 AIP Conference Proceedings  
The DSMC technique is a well-established particle approach for rarefied flows.  ...  Time accurate numerical simulations of a high temperature source cloud of gas expanding into an ambient atmosphere are performed using a multiple temperature gas model and the direct simulation Monte Carlo  ...  The DSMC technique is a well-established particle approach for rarefied flows.  ... 
doi:10.1063/1.1941571 fatcat:knwolz4tc5d4zai2tpe2tthrye

Evaluation of Kinetic/Continuum Solver for Hypersonic Nozzle-Plume Flow

Eswar Josyula, Robert Arslanbekov, Vladimir Kolobov, Sergey F. Gimelshein
2008 Journal of Spacecraft and Rockets  
The particle method known as direct simulation Monte Carlo (DSMC) is widely used today for modeling the high Knudsen number rarefied flows in which the continuum description based on Euler/Navier—Stokes  ...  These deficiencies in particle methods are overcome using direct numerical solution of the Boltzmann equation, which has been shown to be a viable alternative to DSMC for both subsonic flow simulations  ... 
doi:10.2514/1.35431 fatcat:4wkthecx5rfctosjrxbvdzpfe4

Trapping of background plasma electrons in a beam-driven plasma wake field using a downward density transition

H. Suk
2001 AIP Conference Proceedings  
Two-dimensional PIC (Particle-In-Cell) simulations show that a significant amount of plasma electrons are trapped and accelerated to a higher energy than the driving beam energy.  ...  Trapping of background plasma electrons by a beam-driven plasma wake field is studied as a new self-injection method.  ...  ACKNOWLEDGMENTS One of the authors (H.S.) would like to thank Dr. Chris Clayton at UCLA for helpful discussions on the rectangular UV beam method. Eric Esarey was supported by the U.S.  ... 
doi:10.1063/1.1384390 fatcat:dvqno3elf5asfo4j2iwiuolh6m

Electrostatic PIC with adaptive Cartesian mesh

Vladimir Kolobov, Robert Arslanbekov
2016 Journal of Physics, Conference Series  
Challenges of PIC method with cell-based adaptive mesh refinement (AMR) are related to a decrease of the particle-per-cell number in the refined cells with a corresponding increase of the numerical noise  ...  We describe an initial implementation of an electrostatic Particle-in-Cell (ES-PIC) module with adaptive Cartesian mesh in our Unified Flow Solver framework.  ...  Acknowledgments This work was partially supported by the DARPA SBIR Project W31P4Q-15-C-0047 and by the US Department of Energy Office of Fusion Energy Science Contract DE-SC0001939.  ... 
doi:10.1088/1742-6596/719/1/012020 fatcat:nnj2suisu5dwhob3slhrvei6lm
« Previous Showing results 1 — 15 out of 732 results