20.500.12556/DKUM-87773 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 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. numerical simulations computational fluid dynamics numerične simulacije računalniška dinamika tekočin true false true American Institute of Physics Angleški jezik Slovenski jezik Znanstveno delo 2024-03-28 14:18:01 2024-03-28 14:34:26 2024-04-23 08:22:31 0000-00-00 00:00:00 2023 0 0 Str. 1-22 Št. 4, št. članka 045106 Letn. 35 April 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-01-26 2023-03-10 2023-04-03 519.6 153799939 10.1063/5.0143795 1089-7666 Pallares-2023-Numerical_simulations_of_the_flo.pdf Pallares-2023-Numerical_simulations_of_the_flo.pdf 1 748ACB6700029BE3F49A790AE111C4F7 611c34d2e678e09a98c243e7347761fe5f8c43b2369a6591d0390c5879c1385f c3ddd4d2-ed07-11ee-9311-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=177529 https://doi.org/10.1063/5.0143795 0 cb6f2c6c-ed07-11ee-9311-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=177530 Fakulteta za strojništvo 0 0 0