Abstract
Dynamic algebraic closure of scalar dissipation rate (SDR) of reaction progress variable in the context of Large Eddy Simulations (LES) of turbulent premixed combustion has been addressed here using a power-law based expression and a model, which was originally proposed for Reynolds Averaged Navier Stokes (RANS) simulations, but has recently been extended for LES. The performances of these models have been assessed based on a-priori analysis of a Direct Numerical Simulations (DNS) database of statistically planar turbulent premixed flames with a range of different values of heat release parameter t, turbulent Reynolds number R e t and global Lewis number L e. It has been found that the power-law model with a single constant exponent a D does not adequately capture the volume-averaged behaviour of density-weighted SDR and this problem is particularly severe especially for L e < < 1 flames. The deficiency of the power-law model with a single power-law exponent arises due to multi-fractal nature of SDR. The dynamic evaluation of the model parameter for the algebraic model, which was originally proposed in the context of RANS and has been extended here for LES, has been shown to capture the local behaviour of SDR better than the power-law model. It has been demonstrated that the empirical parameterisation of a model parameter for the static version of the RANS-extended SDR model can be avoided using a dynamic formulation which captures the local behaviour of SDR either comparably or better than the static formulation for a range of different values of t, L e and R e t , without sacrificing the prediction of the volume-averaged SDR.
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Gao, Y., Chakraborty, N. & Swaminathan, N. Dynamic Closure of Scalar Dissipation Rate for Large Eddy Simulations of Turbulent Premixed Combustion: A Direct Numerical Simulations Analysis. Flow Turbulence Combust 95, 775–802 (2015). https://doi.org/10.1007/s10494-015-9631-3
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DOI: https://doi.org/10.1007/s10494-015-9631-3