Stochastic modeling for subgrid-scale particle dispersion in large-eddy simulation of inhomogeneous turbulence

Knorps, Maria; Pozorski, Jacek

doi:10.1063/5.0046320

Cited by 14 publications

(3 citation statements)

References 56 publications

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“… 39 Large-eddy simulation (LES) is utilized for providing information for the turbulent flows. All variables of the flow field, including the velocity

and the pressure

, are treated with a filter of the mesh size, except for the subgrid-scale (SGS) stress tensor τ sgs which is resolved by the local dynamic one-equation eddy viscosity SGS model, 40

In all the incompressible solvers provided by OpenFOAM, density ρ is included implicitly. The kinematic pressure

(instead of the pressure

) and the kinematic eddy viscosity (rather than the dynamic eddy viscosity) are solved.…”

Section: Methodsmentioning

confidence: 99%

Computational study on the transmission of the SARS-CoV-2 virus through aerosol in an elevator cabin: Effect of the ventilation system

2021

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Aerosol transmission is now well-established as a route in the spread of the SARS-CoV-2 virus. Factors influencing the transport of virus-laden particles in an elevator cabin are investigated computationally and include human respiratory events, locations of the infected person(s), and the ventilation system (ventilation mode, ventilation capacity, and vent schemes). “Breath,” “cough,” and “sneeze” are defined quantitatively by the fluid jet velocities and particle sizes. For natural ventilation, most particles exhaled by sneezing and coughing tend to deposit on surfaces quickly, but aerosol generated by breathing will remain suspended in the air longer. For forced ventilation, motions of particles under different ventilation capacities are compared. Larger particles otherwise deposited readily on solid surfaces may be slowed down by airflow. Air currents also accelerate the motions of smaller particles, facilitating the subsequent deposition of micrometer or sub-micrometer particles. Locations of the infected person(s) lead to different spreading scenarios due to the distinctive motions of the particles generated by the various respiratory events. Sneeze particles will likely contaminate the person in front of the infected passenger only. Cough particles will increase the risk of all the people around the injector. Breath particles tend to spread throughout the confined environment. An optimized vent scheme is introduced and can reduce particles suspended in the air by up to 80% as compared with commonly used schemes. The purification function of this vent model is robust to various positions of the infected passenger.

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“… 39 Large-eddy simulation (LES) is utilized for providing information for the turbulent flows. All variables of the flow field, including the velocity

and the pressure

, are treated with a filter of the mesh size, except for the subgrid-scale (SGS) stress tensor τ sgs which is resolved by the local dynamic one-equation eddy viscosity SGS model, 40

In all the incompressible solvers provided by OpenFOAM, density ρ is included implicitly. The kinematic pressure

(instead of the pressure

) and the kinematic eddy viscosity (rather than the dynamic eddy viscosity) are solved.…”

Section: Methodsmentioning

confidence: 99%

Computational study on the transmission of the SARS-CoV-2 virus through aerosol in an elevator cabin: Effect of the ventilation system

2021

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“…These contributions are on diverse topics including combustion instability, 150,151 scalar mixing, [152][153][154][155][156] homogeneous isotropic turbulence, [157][158][159][160] turbulent premixed flames, [161][162][163][164][165][166][167][168][169][170][171] turbulent non-premixed flames, [172][173][174][175] wallbounded turbulence, [176][177][178] turbulent combustion modeling, [179][180][181] FDF/PDF, [182][183][184][185][186][187][188][189][190][191][192] and two-phase turbulent flows. [193][194][195][196][197][198]…”

Section: Organization Of This Simentioning

confidence: 99%

Edward E. O'Brien contributions to reactive-flow turbulence

2021

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Professor Edward Ephraim O'Brien ("Ted") has made lasting contributions to the theory and modeling of scalar mixing and reaction in turbulent flows. With a doctoral dissertation at The Johns Hopkins University in 1960, entitled "On the Statistical Behavior of a Dilute Reactant in Isotropic Turbulence," supervised by the legend Stanley Corrsin, and in the company of notable pioneer of turbulence, John Leask Lumley, Ted's academic training propelled him through a prolific career. In the opening article of this Special Issue, we provide a review of some of Ted's contributions. First, a summary is presented of his work on the examination of the failure of the cumulant discard approximation for the scalar mixing. This is followed by a highlight of his impacts on other spectral theories of turbulence including Kraichnan's direct interaction approximation. His contributions to more modern theoretical/computational description of reactive turbulence are discussed next, including the transported probability density function (pdf) formulation, scalar-gradient pdf transport equation, scalar interfaces, and the filtered density function. Finally, some of his research on Direct Numerical Simulation of compressible turbulence is reviewed.

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“…There are several classes of models that attempt to produce realistic particle statistics in the scope of LES. Lagrangian models typically rely on the solution of a stochastic differential equation for every individual particle (see, e.g., [5][6][7][8][9][10]). These models are typically simple to implement, computationally efficient and can also be applied in complex domains.…”

Section: Introductionmentioning

confidence: 99%

An efficient model for subgrid-scale velocity enrichment for large-eddy simulations of turbulent flows

2022

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In some applications of large eddy simulation (LES), e.g., to multiphase turbulent flows, in addition to providing a closure model for the subgrid-scale stress tensor, it is necessary to also provide means to approximate the subgrid-scale velocity field. In this work, we derive a new model for the subgrid-scale velocity that can be used in such LES applications. The model consists in solving a linearized form of the momentum equation for the subgrid-scale velocity using a truncated Fourier-series approach. Solving within a structured grid of statistically homogeneous sub-domains enables the treatment of inhomogeneous problems. It is shown that the generated subgrid-scale velocity emulates key properties of turbulent flows, such as the right kinetic energy spectrum, realistic strain-rotation relations and intermittency. The model is also shown to predict the correct inhomogeneous and anisotropic velocity statistics. The computational costs of the model are still of the same order as the costs of the LES.

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Stochastic modeling for subgrid-scale particle dispersion in large-eddy simulation of inhomogeneous turbulence

Cited by 14 publications

References 56 publications

Computational study on the transmission of the SARS-CoV-2 virus through aerosol in an elevator cabin: Effect of the ventilation system

Computational study on the transmission of the SARS-CoV-2 virus through aerosol in an elevator cabin: Effect of the ventilation system

Edward E. O'Brien contributions to reactive-flow turbulence

An efficient model for subgrid-scale velocity enrichment for large-eddy simulations of turbulent flows

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