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

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

Onderzoeksoutput: Bijdrage aan congresPaperAcademic

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Samenvatting

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’.

Originele taal-2Engels
Aantal pagina's4
StatusGepubliceerd - 1 jan. 2019
Evenement11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, Verenigd Koninkrijk
Duur: 30 jul. 20192 aug. 2019

Congres

Congres11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Land/RegioVerenigd Koninkrijk
StadSouthampton
Periode30/07/192/08/19

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