Accuracy control for large-eddy simulation of turbulent mixing - Integral length-scale approach

B. J. Geurts*, A. Rouhi, U. Piomelli

*Corresponding author for this work

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Abstract

Turbulent flow at high Reynolds numbers is currently not accessible on the basis of direct numerical simulation (DNS) of the Navier-Stokes equations - the computational complexity is too high to allow DNS in most realistic flow conditions. Instead, Large-Eddy Simulation (LES) offers an alternative in which the focus is on capturing the larger dynamic scales of a problem. However, the fundamental closure problem in LES induced by spatial filtering of nonlinear terms, and the role of discretization errors in the numerical treatment of the LES equations, induce a principal uncertainty in any LES prediction. This uncertainty requires quantification and control. We investigate error control capabilities of the Integral Length-Scale Approximation (ILSA) and apply this modeling to transitional and turbulent mixing, focussing on the achieved reliability of LES as function of the grid resolution and ‘sub-filter activity’.

Original languageEnglish
Number of pages4
Publication statusPublished - 1 Jan 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Grand Harbour Hotel, Southampton, United Kingdom
Duration: 30 Jul 20192 Aug 2019
Conference number: 11
http://tsfp11.org/

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Abbreviated titleTSFP 2019
CountryUnited Kingdom
CitySouthampton
Period30/07/192/08/19
Internet address

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    Geurts, B. J., Rouhi, A., & Piomelli, U. (2019). Accuracy control for large-eddy simulation of turbulent mixing - Integral length-scale approach. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.