High-fidelity simulations for polydispersed sprays in the Eulerian–Lagrangian framework need to incorporate subgrid-scale effects in the particle evolution equations. Although the quasi-linear evaporation rate formulation captures evaporating droplet statistics, further improvement is required when subgrid-scale velocity effects become essential. The subgrid dispersion model strongly affects droplets spatial distribution, and subsequently net evaporation rate, depending on how rapidly they are dispersed into the dry air region. The main original contribution of this study is to assess the performances of a number of commonly used dispersion models in a consistent manner, against a reference direct simulation results. The models considered are (i) discrete random walk, (ii) approximate deconvolution method, (iii) stochastic model based on the Langevin equation, and (iv) combined approximate deconvolution method with the Langevin equation. Mass and enthalpy transfer source terms together with droplet diameters and particle distributions were compared against corresponding direct numerical and large-eddy simulations without a model as reference cases. Numerical results at low Stokes and moderate Reynolds numbers indicate that the dispersion model choice does not affect Eulerian field averages or fluctuations. However, proper dispersion models are essential to capture droplet distributions in the far-field region after jet breakup for Stokes number smaller than unity. The unclosed Lagrangian momentum equation without any dispersion model most accurately reproduces direct numerical simulation in the near field.
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July 2022
Research Article|
July 05 2022
Assessment of subgrid dispersion models for large-eddy simulations of turbulent jet flows with dilute spray droplets
Special Collection:
Development and Validation of Models for Turbulent Reacting Flows
Lorenzo Angelilli
;
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing – original draft)
1
Physical Science and Engineering, Clean Combustion Research Center, King Abdullah University of Science and Technology
, Thuwal 23955, Saudi Arabia
a)Author to whom correspondence should be addressed: [email protected]
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Pietro Paolo Ciottoli
;
Pietro Paolo Ciottoli
c)
(Conceptualization, Formal analysis, Investigation, Supervision, Writing – original draft)
2
Department of Aerospace and Mechanical Engineering, Sapienza-University of Rome
, Via Eudossiana 18, 00184 Rome, Italy
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Francesco Picano
;
Francesco Picano
d)
(Conceptualization, Supervision, Writing – review & editing)
3
Department of Aerospace and Mechanical Engineering, University of Padova
, Lungargine del Piovego, 2/3, 35131 Padova, Italy
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Mauro Valorani
;
Mauro Valorani
e)
(Conceptualization, Supervision, Writing – review & editing)
2
Department of Aerospace and Mechanical Engineering, Sapienza-University of Rome
, Via Eudossiana 18, 00184 Rome, Italy
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Hong G. Im
Hong G. Im
f)
(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – review & editing)
1
Physical Science and Engineering, Clean Combustion Research Center, King Abdullah University of Science and Technology
, Thuwal 23955, Saudi Arabia
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a)Author to whom correspondence should be addressed: [email protected]
b)
Also at: Department of Aerospace and Mechanical Engineering, Sapienza-University of Rome, Via Eudossiana 18, 00184 Rome, Italy.
c)
Electronic mail: [email protected]
d)
Electronic mail: [email protected]
e)
Electronic mail: [email protected]
f)
Electronic mail: [email protected]
Note: This paper is part of the special topic, Development and Validation of Models for Turbulent Reacting Flows.
Physics of Fluids 34, 073305 (2022)
Article history
Received:
April 08 2022
Accepted:
June 14 2022
Citation
Lorenzo Angelilli, Pietro Paolo Ciottoli, Francesco Picano, Mauro Valorani, Hong G. Im; Assessment of subgrid dispersion models for large-eddy simulations of turbulent jet flows with dilute spray droplets. Physics of Fluids 1 July 2022; 34 (7): 073305. https://doi.org/10.1063/5.0095138
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