Development of parallel direct simulation Monte Carlo method using a cut-cell Cartesian grid on a single graphics processor

Lo, Ming Chung; Su, C. C.; Wu, Jong-Shinn; Kuo, Fang-An

doi:10.1016/j.compfluid.2014.06.003

Cited by 14 publications

(12 citation statements)

References 20 publications

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“…[20][21] The components of the building and the DSF were created as meshed walls using cut-cell meshes (see Fig.6.). The surroundings of the building and the DSF were also created with cut-cell meshes, whereas the other spaces were created using hexahedral meshes.…”

Section: Computational Domainmentioning

confidence: 99%

Ventilation Rate and Thermal Environment Properties of Double Skin Façade Considering Wind Profile and Direction

Kim

Kwon

Yang

2017

Journal of Asian Architecture and Building Engineering

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This study analyzes the impact of a windy environment on the ventilation rate and the thermal environment of a double skin façade (DSF). The wind profile was used to change the direction of the wind to the front, back, and side directions. Three cases were examined using computational fluid dynamics (CFD) analysis. There were two openings on the front of the DSF in Case 1, openings on the lower and front parts of the DSF in Case 2, and two openings on the front of the DSF for each story in Case 3. The results are as follows. 1) The front wind direction interrupted the release of the cavity's interior air, and the ventilation rate decreased by an average of 47.6% in comparison to the results with wind from the side and back directions. 2) The ventilation rate was highest for the back direction in Cases 1 and 3 and for the side direction in Case 2. The ventilation rate of Case 3 was the lowest.3) The total heat transfer rate of the highest story of the DSF was inversely proportional to the ventilation rate.

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Section: Computational Domainmentioning

confidence: 99%

Ventilation Rate and Thermal Environment Properties of Double Skin Façade Considering Wind Profile and Direction

Kim

Kwon

Yang

2017

Journal of Asian Architecture and Building Engineering

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“…Hypersonic cylinder is a well-known 2D-benchmark. [19][20][21]23,24,28,31,32 It is a Mach 10 (2634.1 m/s) flow of argon at T = 200 K passing over a 12 in. circular cylinder with a fully diffusive surface at T s = 500 K and a nominal free-stream Knudsen number of 0.01.…”

Section: B Steady Hypersonic Flow Over the Cylindermentioning

confidence: 99%

“…In order to provide a sufficient number of subcells that is compatible with the instantaneous number of particles inside each collision cell, Bird proposed the transient adaptive subcell (TAS) technique. 17,18 Since then, TAS technique has been successfully employed both by the first group, [19][20][21] and also by the second group 22-24 of collision schemes. However, due to the inherent limits in the procedure of the second group of collision schemes, the TAS implementation cannot search for a partner through neighbor subcells; therefore, the adaptation was based on more than one "Particle Per Subcell (PPSC)," e.g., PPSC = 4-5.…”

Section: Introductionmentioning

confidence: 99%

“…Hypersonic flow passing over a cylinder is a well-known benchmark, first considered by Lofthouse et al, 31 and then considered as a challenging test case for different DSMC solvers. [19][20][21]23,24,28,32 In addition, Mach 15.6 nitrogen flow over a 25 • -55 • axisymmetric biconic geometry, whose experimental 33,34 and numerical data 26,35 were reported in the literature, is considered. This test case contains high-speed low-density regions, laminar recirculation zone, and interactions between shock waves and separated-flow.…”

Section: Introductionmentioning

confidence: 99%

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A novel simplified Bernoulli trials collision scheme in the direct simulation Monte Carlo with intelligence over particle distances

2015

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This work deals with the development of an intelligent inter-particle collision scheme using the Direct Simulation Monte Carlo (DSMC) method. Conventional DSMC collision schemes cannot perceive collision distances by their own routines and, consequently, must rely on other techniques to provide a choice of collision pairs with a smaller inter-particle space. Here, we propose a modification of the Simplified Bernoulli Trials (SBT) scheme, called the Intelligent Simplified Bernoulli Trials (ISBT) scheme, which can create pseudo-circular subcells that reduce approximately 25%–32% of the mean collision separation distance. The ISBT scheme tries to arrange the particle indexing and collision acceptance-rejection of the SBT scheme in a way that leads to the formation of virtual clusters. These inner-cell clusters then will cause the selection of the “near-neighbor” pair, which leads to smaller mean collision separation distances. Different low- and high-speed test cases, e.g., lid-driven cavity flow, steady hypersonic flow over a two-dimensional cylinder, and Mach 15.6 nitrogen flow over a 25°–55° axisymmetric biconic, are selected to assess the accuracy and efficiency of the ISBT collision scheme.

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“…To check the sensitivity to geometrical differences between different realizations, we studied three different realizations for N ¼ 128 and D f ¼ 2.5. Once constructed, each agglomerate is embedded in one computational domain using the DSMC cut-cell method, 39,40 which allows each and every single particle to be fully resolved. In all the conducted simulations, we fulfil the common DSMC criteria 41,42 to ensure the accuracy of the results.…”

mentioning

confidence: 99%

Simulation of atomic layer deposition on nanoparticle agglomerates

Jin

Kleijn

Ommen

2016

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Coated nanoparticles have many potential applications; production of large quantities is feasible by atomic layer deposition (ALD) on nanoparticles in a fluidized bed reactor. However, due to the cohesive interparticle forces, nanoparticles form large agglomerates, which influences the coating process. In order to study this influence, the authors have developed a novel computational modeling approach which incorporates (1) fully resolved agglomerates; (2) a self-limiting ALD half cycle reaction; and (3) gas diffusion in the rarefied regime modeled by direct simulation Monte Carlo. In the computational model, a preconstructed fractal agglomerate of up to 2048 spherical particles is exposed to precursor molecules that are introduced from the boundaries of the computational domain and react with the particle surfaces until these are fully saturated. With the computational model, the overall coating time for the nanoparticle agglomerate has been studied as a function of pressure, fractal dimension, and agglomerate size. Starting from the Gordon model for ALD coating within a cylindrical hole or trench [Gordon et al., Chem. Vap. Deposition 9, 73 (2003)], the authors also developed an analytic model for ALD coating of nanoparticles in fractal agglomerates. The predicted coating times from this analytic model agree well with the results from the computational model for Df = 2.5. The analytic model predicts that realistic agglomerates of O(109) nanoparticles require coating times that are 3–4 orders of magnitude larger than for a single particle.

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Development of parallel direct simulation Monte Carlo method using a cut-cell Cartesian grid on a single graphics processor

Cited by 14 publications

References 20 publications

Ventilation Rate and Thermal Environment Properties of Double Skin Façade Considering Wind Profile and Direction

Ventilation Rate and Thermal Environment Properties of Double Skin Façade Considering Wind Profile and Direction

A novel simplified Bernoulli trials collision scheme in the direct simulation Monte Carlo with intelligence over particle distances

Simulation of atomic layer deposition on nanoparticle agglomerates

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