Modeling of particle cloud dispersion in compressible gas flows with shock waves

Gai, Guodong; Thomine, Olivier; Hadjadj, A.; Kudriakov, Sergey

doi:10.1063/1.5135774

Cited by 21 publications

(8 citation statements)

References 32 publications

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“…Such phenomenon is also observed in other studies, e.g., in Refs. [11,31]. However, the RPW is not significant for small WDs (e.g., d d,0 = 5-20 μm in our previous study [17]) as it is too weak to be observed.…”

Section: Resultscontrasting

confidence: 52%

“…It is not intended to capture the detailed morphology of either the shock or WDs as such topics have been stressed in the previous studies with two-or three-dimensional configurations [1,10,12,[14][15][16]27,28]. The 1D simplification also has been widely used for particle [29][30][31] or droplet [11,13,32,33] laden flows with shocks. Figure 1(a) shows a schematic of the 1D domain (x = 0-1.6 m) and the initial distribution of WDs.…”

Section: Physical Problemmentioning

confidence: 99%

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Two-phase Interactions between Propagating Shock Waves and Evaporating Water Droplets

Huang

Zhang

2021

ICLASS

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One-dimensional numerical simulations based on hybrid Eulerian-Lagrangian method are performed to study the interactions between propagating shocks and dispersed evaporating water droplets. Two-way coupling for exchanges of mass, momentum, energy and vapour species is adopted for the dilute two-phase gas-droplet flows. Interphase interactions and droplet breakup dynamics are investigated with initial droplet diameters of 30, 50, 70 and 90 μm under an incident shock wave Mach number of 1.3. Novel two-phase flow phenomena are observed when droplet breakup occurs. First, droplets near the two-phase contact surface show obvious dispersed distribution because of the reflected pressure wave that propagates in the reverse direction of the leading shock. The reflected pressure wave grows stronger for larger droplets. Second, spatial oscillations of the gas phase pressure, droplet quantities (e.g., diameter and net force) and two-phase interactions (e.g., mass, momentum, and energy exchange), are observed in the post-shock region when droplet breakup occurs, which are caused by shock / droplet interactions. Third, the spatial distribution of droplets (i.e., number density, volume fraction) also shows strong oscillation in the post-shock region when droplet breakup occurs, which is caused by the oscillating force exerted on the droplets.

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Section: Resultscontrasting

confidence: 52%

Section: Physical Problemmentioning

confidence: 99%

Two-phase Interactions between Propagating Shock Waves and Evaporating Water Droplets

Huang

Zhang

2021

ICLASS

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“…Therefore, it is nontrivial to compute particle forces in such problems, and while many studies have performed simulations of this kind, e.g. [1,2,3,4], it is unclear whether the physical processes at particle scale are well represented, and therefore whether or not the results are reliable. This motivates a detailed assessment of the performance of classical drag laws in problems featuring dense particle suspensions.…”

Section: Introductionmentioning

confidence: 99%

Performance of drag force models for shock-accelerated flow in dense particle suspensions

Osnes¹,

Vartdal²

2021

Preprint

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Models for prediction of drag forces within a particle cloud following shock-acceleration are evaluated with the aid of results from particle-resolved simulations in order to quantify how much the disturbances introduced by the proximity of nearby particles affect the drag forces. The drag models evaluated here consist of quasi-steady forces, undisturbed flow forces, inviscid unsteady forces, and viscous unsteady forces. Two dense particle curtain correction schemes to these forces, based on volume fraction and input velocity, are also evaluated. The models are tested in two ways; first they are evaluated based on volume-averaged flow fields from particle-resolved simulations; secondly, they are applied in Eulerian-Lagrangian simulations, and the results are compared to the particle-resolved simulations.The results show that both correction schemes significantly improve the particle force predictions, but the average total impulse on the particles is still underpredicted by both correction schemes in both tests. With the volume averaged flow fields as input, the volume fraction correction gives the best results. However, in the Eulerian-Lagrangian simulations it is demonstrated that the velocity fluctuation model, associated with the velocity correction scheme, is crucial for obtaining accurate predictions of the mean flow fields.

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“…In the past, there have been many theoretical and experimental studies investigating the physics of the interaction of droplets or solid particles/obstacles with shock waves (Carrier 1958;Rudinger 1964;Olim et al 1990;Geng et al 1994;Chaudhuri et al 2012Chaudhuri et al , 2013Balakrishnan & Bellan 2017;Mouronval et al 2019;Gai et al 2020). Commonly, the particles are assumed to be at rest before they meet the shock at a given velocity.…”

Section: Introductionmentioning

confidence: 99%

“…2019; Gai et al. 2020). Commonly, the particles are assumed to be at rest before they meet the shock at a given velocity.…”

Section: Introductionmentioning

confidence: 99%

A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves

et al. 2020

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Modeling of particle cloud dispersion in compressible gas flows with shock waves

Cited by 21 publications

References 32 publications

Two-phase Interactions between Propagating Shock Waves and Evaporating Water Droplets

Two-phase Interactions between Propagating Shock Waves and Evaporating Water Droplets

Performance of drag force models for shock-accelerated flow in dense particle suspensions

A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves

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