Results 31 to 40 of about 11,419 (300)
Modeling of Knudsen layer effects in micro/nanoscale gas flows [PDF]
, 2011 We propose a power-law based effective mean free path (MFP) model so that the Navier-Stokes-Fourier equations can be employed for the transition-regime flows typical of gas micro/nanodevices.
Dongari, Nishanth +2 more
core +1 more source
Planetesimals in rarefied gas: wind erosion in slip flow [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT A planetesimal moves through the gas of its protoplanetary disc where it experiences a head wind. Though the ambient pressure is low, this wind can erode and ultimately destroy the planetesimal if the flow is strong enough. For the first time, we observe wind erosion in ground-based and microgravity experiments at pressures ...
Gerhard Wurm +5 more
openaire +2 more sources
Propulsion and Power Research, 2012 Hypersonic flows about space vehicles produce flowfields in thermodynamic non-equilibrium with the local Knudsen numbers Kn which may lie in all the three regimes: continuum, transition and rarefied.
Baoguo Wang +3 more
doaj +1 more source
Multiscale simulation of interacting turbulent and rarefied gas flows in the DSMC framework
Theoretical and Applied Mechanics LettersA multiscale stochastic-deterministic coupling method is proposed to investigate the complex interactions between turbulent and rarefied gas flows within a unified framework.
Liyan Luo, Songyan Tian, Lei Wu
doaj +1 more source
Boosting the convergence of low-variance DSMC by GSIS
Advances in Aerodynamics, 2023 The low-variance direct simulation Monte Carlo (LVDSMC) is a powerful method to simulate low-speed rarefied gas flows. However, in the near-continuum flow regime, due to limitations on the time step and spatial cell size, it takes plenty of time to find ...
Liyan Luo, Qi Li, Lei Wu
doaj +1 more source
Multiscale lattice Boltzmann approach to modeling gas flows [PDF]
, 2010 For multiscale gas flows, kinetic-continuum hybrid method is usually used to balance the computational accuracy and efficiency. However, the kinetic-continuum coupling is not straightforward since the coupled methods are based on different theoretical ...
E. F. TORO +6 more
core +2 more sources
Direct simulation Monte Carlo method for gas flows in micro-channels with bends with added curvature
EPJ Web of Conferences, 2017 Gas flows in micro-channels are simulated using an open source Direct Simulation Monte Carlo (DSMC) code dsmcFOAM for general application to rarefied gas flow written within the framework of the open source C++ toolbox called OpenFOAM.
Tisovský Tomáš, Vít Tomáš
doaj +1 more source
, 2017 An efficient third-order discrete unified gas kinetic scheme (DUGKS) with efficiency is presented in this work for simulating continuum and rarefied flows. By employing two-stage time-stepping scheme and the high-order DUGKS flux reconstruction strategy,
Chen, Zhen +3 more
core +1 more source
SIMULATION OF RAREFIED GAS FLOW IN A RECTANGULAR ENCLOSURE
Proceeding of Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), 2018 The present work investigates the effects of rarefaction on gas flow patterns in a lid-driven cavity using the simulation package dsmcFoam, on the OpenFOAM platform. Direct Simulation Monte Carlo (DSMC) method is a simulation technique which caters to the regime in between the computationally intensive molecular dynamics solvers, as well as the often ...
Sumit Chamling Rai +2 more
openaire +2 more sources
Acoustic flows in a slightly rarefied gas
Physical Review Fluids, 2020 The Boltzmann equation provides a rigorous description of gas flows at all degrees of gas rarefaction. Asymptotic analyses of this equation yield valuable insight into the physical mechanisms underlying gas flows. In this article, we report an asymptotic analysis of the Boltzmann-BGK equation for a slightly rarefied gas when the acoustic wavelength is ...
Nicholas Z. Liu +3 more
openaire +2 more sources