A Multiscale Approach for the Numerical Simulation of Turbulent Flows with Droplets.

Autor: Gimenez JM; Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Edifici C1 Campus Nord UPC C/ Gran Capità, 08034 Barcelona, Spain.; Centro de Investigaciones de Métodos Computacionales (CIMEC), Predio CONICET Colectora Ruta Nac Nro 168, Km 0, 3000 Santa Fe, Argentina., Idelsohn SR; Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Edifici C1 Campus Nord UPC C/ Gran Capità, 08034 Barcelona, Spain.; Catalan Institution for Research and Advanced Studies (ICREA), Passeig de Lluis Companys, 23, 08034 Barcelona, Spain., Oñate E; Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Edifici C1 Campus Nord UPC C/ Gran Capità, 08034 Barcelona, Spain.; Universitat Politecnica de Catalunya (UPC), Barcelona, Spain., Löhner R; Center for Computational Fluid Dynamics, College of Science, George Mason University, Fairfax, VA 22030-4444 USA.
Jazyk: angličtina
Zdroj: Archives of computational methods in engineering : state of the art reviews [Arch Comput Methods Eng] 2021; Vol. 28 (6), pp. 4185-4204. Date of Electronic Publication: 2021 Jun 26.
DOI: 10.1007/s11831-021-09614-6
Abstrakt: A multiscale approach for the detailed simulation of water droplets dispersed in a turbulent airflow is presented. The multiscale procedure combines a novel representative volume element (RVE) with the Pseudo Direct Numerical Simulation (P-DNS) method. The solution at the coarse-scale relies on a synthetic model, constructed using precomputed offline RVE simulations and an alternating digital tree, to characterize the non-linear dynamic response at the fine-scale. A set of numerical experiments for a wide range of volume fractions, particle distribution sizes, and external shear forces in the RVE are carried out. Quantitative results of the statistically stationary turbulent state are obtained, and the turbulence modulation phenomenon due to the presence of droplets is discussed. The developed synthetic model is then employed to solve global scale simulations of flows with airborne droplets via the P-DNS method. Improved predictions are obtained for flow conditions where turbulence modulation is noticeable.
Competing Interests: Conflict of Interest StatementOn behalf of all authors, the corresponding author states that there is no conflict of interest.
(© CIMNE, Barcelona, Spain 2021.)
Databáze: MEDLINE
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