Parametric numerical study of passive scalar mixing in shock turbulence interaction

Gao, Xiangyu; Bermejo-Moreno, Iván; Larsson, Johan

doi:10.1017/jfm.2020.292

Cited by 12 publications

(8 citation statements)

References 79 publications

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“…Other recent studies have explored related topics in the context of SITI such as mixing of passive scalars (Boukharfane, Bouali & Mura 2018; Gao, Bermejo-Moreno & Larsson 2020), variable density and multi-fluid flows (Tian et al. 2017; Tian, Jaberi & Livescu 2019), reacting shock waves (Huete et al.…”

Section: Introductionmentioning

confidence: 99%

Reynolds stress anisotropy in shock/isotropic turbulence interactions

Grube

Martı́n

2021

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

Reynolds stress anisotropy in shock/isotropic turbulence interactions

Grube

Martı́n

2021

J. Fluid Mech.

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“…(2018, 2020), Chen & Donzis (2019) and Gao et al. (2020) cover a wide range of Mach numbers and turbulence intensities . The highest turbulence intensities in these studies have been achieved through a combination of modest turbulence Mach numbers and low supersonic mean Mach numbers.…”

Section: Introductionmentioning

confidence: 97%

“…Boukharfane, Bouali & Mura (2018) introduced passive scalar fields into SITI DNS problems to study the enhancement of scalar dissipation rate due to the shock interaction. Finally, Gao, Bermejo-Moreno & Larsson (2020) extended the study of SITI with passive scalars to a wider parameter space that included both the wrinkled and broken shock regimes.…”

Section: Introductionmentioning

confidence: 99%

Compressibility effects on Reynolds stress amplification and shock structure in shock–isotropic turbulence interactions

Grube

Martı́n

2023

J. Fluid Mech.

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Recent direct numerical simulation studies of canonical shock–isotropic turbulence interactions (SITIs) in the highly compressible regime exhibit streamwise Reynolds stress amplification that is significantly higher in some cases than in previous studies; an explanation is offered based on a relatively high Mach number combined with significant dilatational energy in the incident flow. Some cases exhibit a loss of amplification that is associated with a highly perturbed shock structure as the flow parameters approach the threshold between the wrinkled and broken shock regimes. The shock structure perturbations due to the highly compressible incident turbulence match those proposed by Donzis (Phys. Fluids, vol. 24, 2012, 126101) relatively well, but due to the presence of thermodynamic fluctuations in addition to velocity fluctuations in the incident flow, we propose a generalized parametrization based on the root-mean-square Mach number fluctuation in place of the turbulence Mach number. This is found to improve the collapse of the shock structure data, suggesting that the wrinkled–broken shock regime threshold determined previously for vortical turbulence (Donzis, Phys. Fluids, vol. 24, 2012, 126101; Larsson et al., J. Fluid Mech., vol. 717, 2013, pp. 293–321) can be applied to more general isotropic inflow fields using the proposed parametrization.

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“…While earlier studies have concentrated on the high-viscosity regime, a significant effort has also been directed toward understanding mixing in an inertially dominated, chaotic, and turbulent setting. Explorations into this regime include work using direct numerical simulations to study passive scalar mixing via shock-wave interactions over a wide array of governing parameters, such as Mach numbers, Reynolds number, and Schmidt numbers [13]. Based on the early landmark work of Ref.…”

Section: Introductionmentioning

confidence: 99%

Mixing by stirring: Optimizing shapes and strategies

Eggl

Schmid

2022

Phys. Rev. Fluids

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The mixing of binary fluids by stirrers is a commonplace procedure in many industrial and natural settings, and mixing efficiency directly translates into more homogeneous final products, more enriched compounds, and often substantial economic savings in energy and input ingredients. Enhancements in mixing efficiency can be accomplished by unorthodox stirring protocols as well as modified stirrer shapes that utilize unsteady hydrodynamics and vortex-shedding features to instigate the formation of fluid filaments which ultimately succumb to diffusion and produce a homogeneous mixture. We propose a PDE-constrained optimization approach to address the problem of mixing enhancement for binary fluids. Within a gradient-based framework, we target the stirring strategy as well as the crosssectional shape of the stirrers to achieve improved mixedness over a given time horizon and within a prescribed energy budget. The optimization produces a significant enhancement in homogeneity in the initially separated fluids, suggesting promising modifications to traditional stirring protocols.

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Parametric numerical study of passive scalar mixing in shock turbulence interaction

Cited by 12 publications

References 79 publications

Reynolds stress anisotropy in shock/isotropic turbulence interactions

Reynolds stress anisotropy in shock/isotropic turbulence interactions

Compressibility effects on Reynolds stress amplification and shock structure in shock–isotropic turbulence interactions

Mixing by stirring: Optimizing shapes and strategies

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