EPTT 2020

12th Spring School on Transition and Turbulence

Large-Eddy Simulation of smooth channel flow with a stochastic wall model

Submission Author: Livia S. Freire , SP
Co-Authors: Livia S. Freire
Presenter: Livia S. Freire

doi://10.26678/ABCM.EPTT2020.EPT20-0010

 

Abstract

Large Eddy Simulation (LES) is a useful tool in the study of smooth channel flows of high Reynolds number, but when the domain is large enough computational cost restricts the correct representation of the viscous sublayer. In this study, we test the use of a one-dimensional stochastic model (ODT) as an alternative to simulate the flow close to the wall within the LES. This approach comprises the use of one independent ODT (a vertical line) inside each LES grid close to the wall, driven by the LES at the top and providing the lower boundary condition to the LES (two-way coupling). Results of mean velocity and total stress for Re_\tau = 590 and 5200 are similar to Direct Numerical Simulation, and they have the correct order of magnitude for velocity variances.

Keywords

Large Eddy Simulation, One-Dimensional Turbulence, smooth channel flow

 

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