Error analysis of large-eddy simulation of the turbulent non-premixed sydney bluff-body flame |
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| Authors: | AM Kempf BJ Geurts JC Oefelein |
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| Affiliation: | aDepartment of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, United Kingdom;bMultiscale Modeling and Simulation, Faculty EEMCS, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;cAnisotropic Turbulence, Laboratory for Fluid Dynamics, Faculty Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;dCombustion Research Facility, Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551, USA |
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| 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 error-landscape 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. |
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| Keywords: | Large-eddy simulation Turbulent non-premixed combustion Error analysis |
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