Error analysis of large-eddy simulation of the turbulent non-premixed sydney bluff-body flame

Authors

A. M. Kempf, Imperial College London, Exhibition Road, South Kensington, London
B. J. Geurts, University of Twente, The Netherlands; Eindhoven University of Technology, The Netherlands
J. C, Oefelein, Sandia National Laboratories, Livermore, CA

Date of this Version

2011

Citation

Combustion and Flame 158 (2011) 2408–2419;

doi:10.1016/j.combustflame.2011.04.012

Abstract

A computational error analysis is applied to the large-eddy simulation of the turbulent non-premixed Sydney bluff-body flame, where the error is defined with respect to experimental data. The errorlandscape approach is extended to heterogeneous compressible turbulence, which is coupled to combustion as described by a flamelet model. The Smagorinsky model formulation is used to model the unknown turbulent stresses. We introduce several measures to quantify the total simulation error and observe a striking ‘valley-structure’ in the error that arises as function of the spatial resolution and the Smagorinsky length parameter. The optimal refinement strategy that can be extracted from this error-landscape is reminiscent of that for non-reacting turbulent flow.