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

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

Research output: Contribution to conferencePaperAcademic

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 - 2 Aug 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: 30 Jul 20192 Aug 2019

Conference

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

Fingerprint

turbulent mixing
large eddy simulation
Large eddy simulation
Direct numerical simulation
Navier-Stokes equations
turbulent flow
Reynolds number
Navier Stokes equations
Turbulent flow
simulation
Computational complexity
filter
prediction
modeling
Uncertainty

Cite this

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.
Geurts, B.J. ; Rouhi, A. ; Piomelli, U. / 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.4 p.
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Geurts, BJ, 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, 30/07/19 - 2/08/19.

Accuracy control for large-eddy simulation of turbulent mixing : integral length-scale approach. / Geurts, B.J.; Rouhi, A.; Piomelli, U.

2019. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.

Research output: Contribution to conferencePaperAcademic

TY - CONF

T1 - Accuracy control for large-eddy simulation of turbulent mixing

T2 - integral length-scale approach

AU - Geurts, B.J.

AU - Rouhi, A.

AU - Piomelli, U.

PY - 2019/8/2

Y1 - 2019/8/2

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AB - 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’.

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