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• W2094629488 abstract "Classical large-eddy simulation (LES) modelling assumes that the passive subgrid-scale (SGS) models do not influence large-scale quantities, even though there is now ample evidence of this in many flows. In this work, direct numerical simulation (DNS) and large-eddy simulations of turbulent planar jets at Reynolds number ReH = 6000 including a passive scalar with Schmidt number Sc = 0.7 are used to study the effect of several SGS models on the flow integral quantities e.g. velocity and scalar jet spreading rates. The models analysed are theSmagorinsky, dynamic Smagorinsky, shear-improved Smagorinsky and the Vreman. Detailed analysis of the thin layer bounding the turbulent and non-turbulent regions – the so-called turbulent/non-turbulent interface (TNTI) – shows that this region raises new challenges for classical SGS models. The small scales are far from equilibrium and contain a high fraction of the total kinetic energy and scalar variance, but the situation is worse for the scalar than for the velocity field. Both a-priori and a-posteriori (LES) tests show that the dynamic Smagorinsky and shear-improved models give the best results because they are able to accurately capture the correct statistics of the velocity and passive scalar fluctuations near the TNTI. The results also suggest the existence of a critical resolution Δx, of the order of the Taylor scale λ, which is needed for the scalar field. Coarser passive scalar LES i.e. Δx ≥ λ results in dramatic changes in the integral quantities. This fact is explained by the dynamics of the small scales near the jet interface." @default.
• W2094629488 created "2016-06-24" @default.
• W2094629488 creator A5001621897 @default.
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• W2094629488 date "2015-01-23" @default.
• W2094629488 modified "2023-10-18" @default.
• W2094629488 title "The effect of subgrid-scale models on the entrainment of a passive scalar in a turbulent planar jet" @default.
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• W2094629488 doi "https://doi.org/10.1080/14685248.2014.986329" @default.
• W2094629488 hasPublicationYear "2015" @default.
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