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A-Priori Validation of Scalar Dissipation Rate Models for Turbulent Non-Premixed Flames |
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| Authors: | Sitte M P Turquand d’Auzay C Giusti A Mastorakos E Chakraborty N |
| Institution: | 1.Hopkinson Laboratory, Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK ;2.School of Engineering, Newcastle University, Newcastle-Upon-Tyne, NE1 7RU, UK ;3.Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 1AL, UK ; |
| Abstract: | The modelling of scalar dissipation rate in conditional methods for large-eddy simulations is investigated based on a priori direct numerical simulation analysis using a dataset representing an igniting non-premixed planar jet flame. The main objective is to provide a comprehensive assessment of models typically used for large-eddy simulations of non-premixed turbulent flames with the Conditional Moment Closure combustion model. The linear relaxation model gives a good estimate of the Favre-filtered scalar dissipation rate throughout the ignition with a value of the related constant close to the one deduced from theoretical arguments. Such value of the constant is one order of magnitude higher than typical values used in Reynolds-averaged approaches. The amplitude mapping closure model provides a satisfactory estimate of the conditionally filtered scalar dissipation rate even in flows characterised by shear driven turbulence and strong density variation. |
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