DNS and LES of primary atomization of turbulent liquid jet injection into a gaseous crossflow environment

Mukundan, Anirudh Asuri; Tretola, Giovanni; Ménard, Thibaut; Herrmann, Marcus; Navarro‐Martinez, S.; Vogiatzaki, Konstantina; Motta, Jorge César Brändle de; Berlemont, Alain

doi:10.1016/j.proci.2020.08.004

Cited by 26 publications

(8 citation statements)

References 27 publications

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“…First, an accurate turbulence model is key in obtaining reliable fire modeling results. Large eddy simulation (LES) and direct numerical simulation (DNS) are scale‐resolving approaches for turbulence that are commonly combined with CFD for fire dynamics analysis 23 . Specifically, DNS means that the whole range of spatial and temporal scales of the turbulence must be resolved.…”

Section: Research Backgroundmentioning

confidence: 99%

“…Large eddy simulation (LES) and direct numerical simulation (DNS) are scale-resolving approaches for turbulence that are commonly combined with CFD for fire dynamics analysis. 23 Specifically, DNS means that the whole range of spatial and temporal scales of the turbulence must be resolved. To compare, LES ignores the smallest length scales, which are the most computationally expensive to resolve.…”

Section: Numerical Modeling Techniques For Fire Dynamics Analysismentioning

confidence: 99%

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A building information modeling‐fire dynamics simulation integrated framework for the simulation of passive fire protection in a mid‐scale cross‐laminated timber compartment: Numerical implementation and benchmarking

2022

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Construction fires are a big threat to worker safety and property safety. Mass timber buildings under construction are largely unprotected as they are not yet equipped with active fire protection systems. With the addition of Types IVA, B, and C, the 2021 International Building Code adopted stricter requirements for mass timber buildings that are under construction. Cross‐laminated timber (CLT) is used as the primary structural element for high‐rise mass timber buildings. However, to date, limited number of research studies investigated the impact of passive fire protection for CLT buildings that are under construction. To facilitate a better understanding of construction fires and their consequences, it is necessary to develop a numerical modeling solution for the early phases of a CLT construction project, which can be achieved by using building information models together with fire dynamics simulation (FDS). However, the numerical modeling technique must be benchmarked against experimental data first to then extrapolate the modeling technique to explore other parameters and conduct FDS analysis. Therefore, this paper develops and benchmarks a numerical modeling solution against a mid‐scale CLT compartment fire test by applying the FDS tool to simulate the fire behavior within the CLT compartment. The FDS analysis results are expected to validate the practicality of simulating the fire behavior in CLT structures using the numerical model proposed in this study. The overarching goal of this study is therefore to develop a comprehensive numerical modeling solution to simulate and assess passive fire protection sequencing in CLT buildings that are under construction.

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Section: Research Backgroundmentioning

confidence: 99%

Section: Numerical Modeling Techniques For Fire Dynamics Analysismentioning

confidence: 99%

A building information modeling‐fire dynamics simulation integrated framework for the simulation of passive fire protection in a mid‐scale cross‐laminated timber compartment: Numerical implementation and benchmarking

2022

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“…The liquid/gas interface is represented by level set contiguous signed distance function and the mass conservation in the computational domain is ensured using volume fraction (see Section 3.3 for more details). This solver has been validated for various cases of complex turbulent flow configurations [57,58,59] thus, the numerical methods employed in this solver are tailored for treating turbulence in the system.…”

Section: Flow Solvermentioning

confidence: 99%

Detailed numerical simulations of primary atomization of airblasted liquid sheet

Mukundan

Ménard

Motta

et al. 2022

International Journal of Multiphase Flow

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“…In particular, it has been used to investigate the transmission of respiratory infections by means of the mucosalivary droplets exhaled during violent expiratory events [1,2], as well as by talking. The main limitation though of EL implementations is the spherical droplet assumption, which can lead to inaccuracies in the predictions of trans-critical and super-critical conditions where highly distorted droplets are present [3] or in set-ups such as cross flow jets where non spherical ligaments are present [4]. In this paper, a novel spray model able to account for the droplet deformation (based on the concept of the surface density approach [5]) has been developed within OpenFOAM.…”

Section: Introductionmentioning

confidence: 99%

Modelling Droplet Deformation for Sneezing Events using the Eulerian-Lagrangian Particle Surface Approach

Gerbino

Vogiatzaki

Morgan

et al. 2021

ICLASS

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The Eulerian-Lagrangian approach is widely employed for spray simulations in various applications ranging from transportation systems to environmental flows. Traditional implementations of this technique are based on the assumption that the liquid droplets are spherical. This assumption is unphysical for several applications that droplets vary in shapes. The droplet shape and more specifically the droplet surface affects phenomena like evaporation and drag and consequently the droplet dynamics. Eulerian-Lagrangian simulations have been widely used in the modelling of infectious diseases. Experimental observations on respiratory droplets have shown that during a violent expiratory event, a sneeze, the exhaled saliva forms ligaments of various sizes. Since the shape of the droplets affects the evolution of the spray which in turn determines how far infectious droplets can travel, it is necessary to overcome the spherical assumption limitation in computational models. A novel spray model able to account for the droplet deformation is being developed and it is used in this paper to analyse the droplet deformation during a sneezing event. Results are compared to experimental observations. Such a new model can also be applied to spray injection within ICE or in jets in crossflow relevant to gas turbines.

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DNS and LES of primary atomization of turbulent liquid jet injection into a gaseous crossflow environment

Cited by 26 publications

References 27 publications

A building information modeling‐fire dynamics simulation integrated framework for the simulation of passive fire protection in a mid‐scale cross‐laminated timber compartment: Numerical implementation and benchmarking

A building information modeling‐fire dynamics simulation integrated framework for the simulation of passive fire protection in a mid‐scale cross‐laminated timber compartment: Numerical implementation and benchmarking

Detailed numerical simulations of primary atomization of airblasted liquid sheet

Modelling Droplet Deformation for Sneezing Events using the Eulerian-Lagrangian Particle Surface Approach

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