A two-way coupled Euler-Lagrange method for simulating multiphase flows with discontinuous Galerkin schemes on arbitrary curved elements

Ching, Eric J.; Brill, Steven; Barnhardt, Michael; Ihme, Matthias

doi:10.1016/j.jcp.2019.109096

Cited by 36 publications

(13 citation statements)

References 45 publications

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“…This section briefly summarizes the algorithmic details of the particle solver. Reference [8] provides a more complete description.…”

Section: Particle Solvermentioning

confidence: 99%

“…The use of curved elements gives rise to the possibility of aberrant scenarios not observed in particle-wall collisions on straight-sided meshes. Reference [8] discusses these scenarios in detail, as well as strategies for dealing with them.…”

Section: Particle Solvermentioning

confidence: 99%

“…Table 1 outlines the flow conditions (note that in Ref. [8], we investigate additional conditions). We consider only the forebody of the sphere and discretize the domain using a 60,000-element hexahedral mesh with curved elements of quadratic order.…”

Section: A Setupmentioning

confidence: 99%

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Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Ching

Ihme

2019

AIAA Scitech 2019 Forum

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Recent interest in human-scale Mars missions has motivated research into the effects of dust particles that are suspended in the Martian atmosphere on reentry vehicles. For instance, these dust particles can enhance erosion of thermal protection systems and amplify surface heat fluxes. As such, in this work, we perform numerical simulations of hypersonic dusty flows over a blunt body using a two-way-coupled Lagrangian particle method in a discontinuous Galerkin framework. Due to the lack of a well-established physical model of the disperse phase appropriate for this multiphase flow regime, we aim to evaluate the sensitivities of numerically predicted dust-induced heat flux augmentation to various components and parameters of the model. Specifically, we investigate the drag coefficient correlation, the Nusselt number correlation, different terms in the particle momentum and energy equations, and particle size.

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“…This section briefly summarizes the algorithmic details of the particle solver. Reference [8] provides a more complete description.…”

Section: Particle Solvermentioning

confidence: 99%

Section: Particle Solvermentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Ching

Ihme

2019

AIAA Scitech 2019 Forum

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“…Overall, developments related to Eulerian-Lagrangian formulations have led to improved descriptions and broadened their application range. For example, Ireland and Desjardins [23] introduced a simple approach to correct the implementation of drag models for systems with two-way coupling, while Ching et al [24] considered compressible particle-laden flows by suggesting a two-way coupled Eulerian-Lagrangian method for simulating multiphase flows with discontinuous Galerkin schemes on arbitrary curved elements in one-and two-way coupling models.…”

Section: Introductionmentioning

confidence: 99%

Description of a Eulerian–Lagrangian Approach for the Modeling of Cooling Water Droplets

et al. 2021

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The present paper describes a tool developed in-house for the modeling of free-falling water droplet cooling processes. A two-way coupling model is employed to account for the interactions between the droplets and the carrier fluid, following a Eulerian–Lagrangian approach. In addition, a stochastic separated flow technique is employed, involving random sampling of the fluctuating fluid velocity. In physical modeling, two empirical correlations are considered for determining the heat and mass transfer coefficients, with the possibility of accounting for vibrations. The numerical results indicate the preponderance of the interactions between droplet and carrier fluid at various humidity ratios.

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“…Elangovan and Cao [11] and Saito et al [12] have performed two-dimensional CFD analysis using a pure Eulerian approach for both the particles and the flowfield where the particle trajectory and fluid dynamic equations were solved together using the same grid. Recently, a Lagrangian particle tracking methodology using a high-order discontinuous Galerkin scheme by Palmer et al [10] and others [13,14] was used to compute coupled particle-fluid simulations of high-speed dusty flows over blunt bodies. Care must be taken when using a full Eulerian approach and in the choice of the drag and heat transfer model because the dust particles are small enough such that the flow around the particle is usually in the non-continuum regime [9].…”

Section: Introductionmentioning

confidence: 99%

Microscale modeling of particle impact on TPS materials during high-speed entry

Poovathingal¹,

Chen²

2021

Preprint

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Micron-sized particles suspending in planetary atmospheres can damage thermal protectionsystems (TPS) during entry of space capsules into planetary bodies. TPS materials arecomplex heterogeneous carbon composites, where the microstructure of the composite can playa pivotal role in the propagation of the damage caused by the impact. Here, we present anapplication of a novel computational technique called the lattice particle method to understandthe initiation and growth of craters formed on TPS materials upon impact by particles. Thesimulations are initially compared against experiments that used borosilicate as the impactingparticle and fused silica as the target surface. The simulations reproduce the damage profiles,diameters, and depths of the craters being formed on the target silica surface. A parametricstudy is then performed by varying the fracture strength of the target surface and the impactingparticle. It is found that the profiles of the damaged region on the silica surface primarilydepends on the fracture strength of the silica surface, and not the impacting particle. Thesimulations are extended to model the damage of porous carbon composites that are used asTPS materials. Microstructures of carbon composites are generated using an in-house codethat has been shown to reproduce features of the real material in past studies. While thecrater depth on the fused silica surface was within 38% irrespective of the fracture strengthof the particle, the damaged depth changes by at least an order of magnitude when a carboncomposite surface is used and the fracture strength of the impacting particle is varied. Finally,the influence of damage on the effective permeability is computed using the direct simulationMonte Carlo technique. The maximum increase in the permeability force for the damagedmicrostructures is found to be 20%, which suggests that the crater created in the damagedmicrostructure does not significantly influence the path traversed by gases percolating throughthe porous TPS material.

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A two-way coupled Euler-Lagrange method for simulating multiphase flows with discontinuous Galerkin schemes on arbitrary curved elements

Cited by 36 publications

References 45 publications

Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Description of a Eulerian–Lagrangian Approach for the Modeling of Cooling Water Droplets

Microscale modeling of particle impact on TPS materials during high-speed entry

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