publication . Article . 2015

Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow

Sam Ali Al; Szasz Robert; Revstedt Johan;
Open Access
  • Published: 01 Jan 2015 Journal: E3S Web of Conferences, volume 5, page 3,002 (eissn: 2267-1242, Copyright policy)
  • Publisher: EDP Sciences
Abstract
The performance of the Sub Grid Scale models is studied by simulating a separated flow over a wavy channel. The first and second order statistical moments of the resolved velocities obtained by using Large-Eddy simulations at different mesh resolutions are compared with Direct Numerical Simulations data. The effectiveness of modeling the wall stresses by using local log-law is then tested on a relatively coarse grid. The results exhibit a good agreement between highly-resolved Large Eddy Simulations and Direct Numerical Simulations data regardless the Sub Grid Scale models. However, the agreement is less satisfactory with relatively coarse grid without using any...
Subjects
arXiv: Physics::Fluid Dynamics
free text keywords: Scale model, Grid, Communication channel, Simulation, Separation zone, Method of moments (statistics), Mechanics, Computer science, Flow (psychology), Environmental sciences, GE1-350
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