| Title: | Numerical simulations of the flow and aerosol dispersion in a violent expiratory event : Outcomes of the “2022 International Computational Fluid Dynamics Challenge on violent expiratory events |
|---|
| Authors: | ID Pallares, Jordi (Author)
ID Fabregat Tomas, Alexandre (Author)
ID Lavrinenko, Akim (Author)
ID Akmal bin Norshamsudin, Hadifathul (Author)
ID Janiga, Gabor (Author)
ID Fletcher, David Frederick (Author)
ID Inthavong, Kiao (Author)
ID Zasimova, Marina (Author)
ID Ris, Vladimir (Author)
ID Ivanov, Nikolay (Author)
ID Castilla, Robert (Author)
ID Gamez-Montero, Pedro Javier (Author)
ID Raush, Gustavo (Author)
ID Calmet, Hadrien (Author)
ID Mira, Daniel (Author)
ID Wedel, Jana (Author)
ID Štrakl, Mitja (Author)
ID Ravnik, Jure (Author)
ID Fontes, Douglas Hector (Author)
ID De Souza, Francisco José (Author)
ID Marchioli, Cristian (Author)
ID Cito, Salvatore (Author) |
|---|
| Files: |  Pallares-2023-Numerical_simulations_of_the_flo.pdf (8,63 MB)
MD5: 748ACB6700029BE3F49A790AE111C4F7
 https://doi.org/10.1063/5.0143795
|
|---|
| Language: | English |
|---|
| Work type: | Scientific work |
|---|
| Typology: | 1.01 - Original Scientific Article |
|---|
| Organization: | FS - Faculty of Mechanical Engineering
|
|---|
| Abstract: | This paper presents and discusses the results of the “2022 International Computational Fluid Dynamics Challenge on violent expiratory events” aimed at assessing the ability of different computational codes and turbulence models to reproduce the flow generated by a rapid prototypical exhalation and the dispersion of the aerosol cloud it produces. Given a common flow configuration, a total of 7 research teams from different countries have performed a total of 11 numerical simulations of the flow dispersion by solving the Unsteady Reynolds Averaged Navier–Stokes (URANS) or using the Large-Eddy Simulations (LES) or hybrid (URANS-LES) techniques. The results of each team have been compared with each other and assessed against a Direct Numerical Simulation (DNS) of the exact same flow. The DNS results are used as reference solution to determine the deviation of each modeling approach. The dispersion of both evaporative and non-evaporative particle clouds has been considered in 12 simulations using URANS and LES. Most of the models predict reasonably well the shape and the horizontal and vertical ranges of the buoyant thermal cloud generated by the warm exhalation into an initially quiescent colder ambient. However, the vertical turbulent mixing is generally underpredicted, especially by the URANS-based simulations, independently of the specific turbulence model used (and only to a lesser extent by LES). In comparison to DNS, both approaches are found to overpredict the horizontal range covered by the small particle cloud that tends to remain afloat within the thermal cloud well after the flow injection has ceased. |
|---|
| Keywords: | numerical simulations, computational fluid dynamics |
|---|
| Publication status: | Published |
|---|
| Publication version: | Version of Record |
|---|
| Submitted for review: | 26.01.2023 |
|---|
| Article acceptance date: | 10.03.2023 |
|---|
| Publication date: | 03.04.2023 |
|---|
| Publisher: | American Institute of Physics |
|---|
| Year of publishing: | 2023 |
|---|
| Number of pages: | Str. 1-22 |
|---|
| Numbering: | Letn. 35, Št. 4, št. članka 045106 |
|---|
| PID: | 20.500.12556/DKUM-87773  |
|---|
| UDC: | 519.6 |
|---|
| ISSN on article: | 1089-7666 |
|---|
| COBISS.SI-ID: | 153799939 |
|---|
| DOI: | 10.1063/5.0143795 |
|---|
| Publication date in DKUM: | 28.03.2024 |
|---|
| Views: | 456 |
|---|
| Downloads: | 458 |
|---|
| Metadata: |    |
|---|
| Categories: | Misc.
|
|---|
|
:
|
Copy citation |
|---|
| | | | Average score: | (0 votes) |
|---|
| Your score: | Voting is allowed only for logged in users. |
|---|
| Share: |  |
|---|
Hover the mouse pointer over a document title to show the abstract or click
on the title to get all document metadata. |
