dsmcFoam+: An OpenFOAM based direct simulation Monte Carlo solver

White, Craig; Borg, Matthew K.; Scanlon, Thomas; Longshaw, Stephen; John, Benzi; Emerson, David R.; Reese, Jason M.

doi:10.1016/j.cpc.2017.09.030

Cited by 156 publications

(74 citation statements)

References 29 publications

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“…The major steps in the DSMC method consist of initialising, moving the particles, indexing the DSMC particles, making collisions and then finally sampling the DSMC particles to calculate the macroscopic properties. In this study, an improved DSMC solver of the OpenFOAM software package (Scanlon, Roohi et al, 2010), dsmcFoam+ (White, Borg et al 2018) has been used. An i7 workstation with parallel dsmcFoam+ code has been used to compute flow in nano/micro lid driven cavity and each computation has taken 3-4 days on computation.…”

Section: The Dsmc Methodsmentioning

confidence: 99%

Effect of Knudsen Number, Lid Velocity and Velocity Ratio on Flow Features of Single and Double Lid Driven Cavities

Mukherjee

Shahabi

Gowtham

et al. 2019

JAFM

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Effects of Knudsen number, lid velocity and velocity ratio are investigated on the flow features of single lid driven cavity with an aspect ratio of one and double lid driven cavity of aspect ratio two. Knudsen numbers studied are 0.01(early slip regime), 0.1 (slip regime) and 1 (transitional regime). Lid velocities investigated are 100 m/s, 200 m/s and 500 m/s. The velocity ratios explored are 1 and -1. Knudsen number was found to have a huge impact on the flow rigidity. Lid velocity tends to shift the central vortex to the top left of the cavity for a cavity with aspect ratio of one and shifts the upper vortex to the top left of the cavity for a cavity with aspect ratio of two. Lid velocity does not affect the slip to a great extent on the lid. Changing the velocity ratio from 1 to -1 leads to the reversal of the relative vorticity in the top and bottom half of the cavity.

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Section: The Dsmc Methodsmentioning

confidence: 99%

Effect of Knudsen Number, Lid Velocity and Velocity Ratio on Flow Features of Single and Double Lid Driven Cavities

Mukherjee

Shahabi

Gowtham

et al. 2019

JAFM

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“…In all cases, the IMM results have been validated against full-scale DSMC simulation results for the same flow configuration. All DSMC simulations (both fullscale DSMC as well as IMM subdomain atomistic solutions) have been carried out using the dsmcFoam + code (White et al 2017). The dsmcFoam + code operates within the framework of the open source CFD code, OpenFOAM (2014), and has been validated for a wide range of benchmark test cases (John et al 2016;Palharini et al 2015;Scanlon et al 2010;White et al 2017).…”

Section: Resultsmentioning

confidence: 99%

“…All DSMC simulations (both fullscale DSMC as well as IMM subdomain atomistic solutions) have been carried out using the dsmcFoam + code (White et al 2017). The dsmcFoam + code operates within the framework of the open source CFD code, OpenFOAM (2014), and has been validated for a wide range of benchmark test cases (John et al 2016;Palharini et al 2015;Scanlon et al 2010;White et al 2017). To ensure accuracy of both our subdomain and full DSMC simulations, we have followed the established guidelines with respect to the cell size, time step, and particle numbers (Alexander et al 1998;Hadjiconstantinou 2000;Hadjiconstantinou et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Simulation of the head-disk interface gap using a hybrid multi-scale method

John

Lockerby

Patronis

et al. 2018

Microfluid Nanofluid

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We present a hybrid multi-scale method that provides a capability to capture the disparate scales associated with modelling flow in micro-and nano-devices. Our model extends the applicability of an internal-flow multi-scale method by providing a framework to couple the internal (small scale) flow regions to the external (large scale) flow regions. We demonstrate the application of both the original methodology and the new hybrid approach to model the flow field in the vicinity of the head-disk interface gap of a hard disk drive enclosure. The internal flow regions within the gap are modelled by an extended internal-flow multi-scale method that utilises a finite-difference scheme for non-uniform grids. Our proposed hybrid multiscale method is then employed to couple the internal micro-flow region to the flow external to the gap, to capture entrance/ exit effects. We also demonstrate the successful application of the method in capturing other localised phenomena (e.g. those due to localised wall heating).Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…DSMC simulators each represent a large number of real molecules/atoms and are moved ballistically, while collision events are treated stochastically after the movement step, thus making the DSMC algorithm tractable across a wide range of Knudsen numbers ranging from the continuum-slip regime to the free-molecular regime. This work makes use of the open-source dsmcFoam+ [3] solver that is available at [4].…”

Section: Methodology the Direct Simulation Monte Carlo Methodsmentioning

confidence: 99%

Effective diffusivity in porous media under rarefied gas conditions

Casseau¹,

White²

2019

31st International Symposium on Rarefied Gas Dynamics: Rgd31

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For future space missions in which soft landings on extra-terrestrial bodies will be required, it is important to understand the interaction of the propulsion system with the surface of the body. During the landing phase, the porous surface regolith can become contaminated with the exhaust products of the rocket plume, and this contamination must be minimised if sample return from the landing site is the goal of the mission. How far in-depth the exhaust products can reach depends on the effective diffusivity of the gas in the porous surface regolith material. The purpose of this work is to study the influence of temperature, gas number density, and adsorption parameters on the effective diffusivity in highly porous media under rarefied conditions. The procedure to recover the effective diffusivity, using direct simulation Monte Carlo, from a real sample is presented, along with trends as parameters are being varied, which will prove informative for later use of simplified engineering methodologies that assume a homogeneous porous structure.

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dsmcFoam+: An OpenFOAM based direct simulation Monte Carlo solver

Cited by 156 publications

References 29 publications

Effect of Knudsen Number, Lid Velocity and Velocity Ratio on Flow Features of Single and Double Lid Driven Cavities

Effect of Knudsen Number, Lid Velocity and Velocity Ratio on Flow Features of Single and Double Lid Driven Cavities

Simulation of the head-disk interface gap using a hybrid multi-scale method

Effective diffusivity in porous media under rarefied gas conditions

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