An a priori DNS analysis of scale similarity based combustion models for LES of non-premixed jet flames
| Autor: | Alberto Cuoci, Amsini Sadiki, Ali Shamooni, Tiziano Faravelli |
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| Rok vydání: | 2019 |
| Předmět: |
Scale (ratio)
020209 energy General Chemical Engineering Direct numerical simulation General Physics and Astronomy 02 engineering and technology Combustion 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Filter (large eddy simulation) 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Range (statistics) Physical and Theoretical Chemistry Physics Jet (fluid) Turbulence Mechanics Dissipation Dynamic scale similarity LES Extinction re-ignition Turbulent combustion modelling A priori DNS EDC |
| Zdroj: | Flow, Turbulence and Combustion. 104:605-624 |
| ISSN: | 1573-1987 1386-6184 |
| Popis: | In this work, recently developed finite-rate dynamic scale similarity (SS) sub-grid scale (SGS) combustion models have been a priori assessed and compared with the Eddy Dissipation Concept (EDC) and “no model” approaches based on a Direct Numerical Simulation (DNS) database of a temporally evolving non-premixed jet flame. Two different filter widths, one placed in the inertial range and the other in the near dissipation range, have been used. The analyses were carried out in two time instants corresponding to instants of maximum local extinction and re-ignition. Conditional averaged filtered chemical source terms, conditioned on different parameters in the composition space, have been presented. Improvements are observed using the dynamic SS models compared to the two other approaches in the prediction of filtered chemical source terms of individual species while using larger filter widths. However, discrepancies still exists using the dynamic SS model on the turbulent/non-turbulent interfaces of the jet, mainly in the prediction of the oxidizer consumption rate. |
| Databáze: | OpenAIRE |
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