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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Large-Eddy Simulation of smooth and rough channel flows using a one-dimensional stochastic wall model

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Author(s):
Freire, Livia S. [1] ; Chamecki, Marcelo [2]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Sao Carlos, SP - Brazil
[2] Univ Calif Los Angeles, Los Angeles, CA - USA
Total Affiliations: 2
Document type: Journal article
Source: COMPUTERS & FLUIDS; v. 230, NOV 15 2021.
Web of Science Citations: 0
Abstract

In this study a stochastic wall model based on the `'large-eddy'' version of the One-Dimensional Turbulence (ODT) model was developed for Large-Eddy Simulation (LES) of smooth and rough channel flows, with the primary goal of providing a refined turbulent flow field near the wall. This LES-ODT coupling was tested with the dynamic Smagorinsky and the scale-dependent Lagrangian dynamic subgrid-scale models. When compared to the same LES with a wall model based on a local law-of-the-wall, LES-ODT improved the one-dimensional energy spectra for all three velocity components close to the wall for both subgrid-scale models tested. More importantly, improving the LES wall model had a more positive effect in the near-wall spectra than improving the subgrid-scale model from the traditional dynamic to the scale-dependent Lagrangian dynamic model. For smooth channels, LES-ODT results compared well with DNS of Re-lambda = 590 and 5200; however, the variance modeled by the ODT presents discrepancies for all three velocity components, an issue inherent to ODT. Finally, the simulation of a channel flow with additional roughness modeled by a drag force was compared to data of atmospheric flow through a maize field, providing evidence of the potential for this approach to directly simulate complex near-wall phenomena. Given its high computational cost, the main use of the LES-ODT coupling is in studies that require a refinement of the near-wall region without the need to refine the entire LES domain. (AU)

FAPESP's process: 19/14371-7 - Study on exchanges between earth's surface and atmosphere using Large-Eddy Simulation
Grantee:Livia Souza Freire Grion
Support Opportunities: Scholarships in Brazil - Young Researchers
FAPESP's process: 13/07375-0 - CeMEAI - Center for Mathematical Sciences Applied to Industry
Grantee:Francisco Louzada Neto
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 18/24284-1 - Study on exchanges between Earth's surface and atmosphere using Large-Eddy Simulation
Grantee:Livia Souza Freire Grion
Support Opportunities: Research Grants - Young Investigators Grants