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- W2969372000 abstract "Aspects of turbulent shear-layer mixing are investigated over a range of shear-layer Reynolds numbers, $Re_{unicode[STIX]{x1D6FF}}=unicode[STIX]{x0394}Uunicode[STIX]{x1D6FF}/unicode[STIX]{x1D708}$ , based on the shear-layer free-stream velocity difference, $unicode[STIX]{x0394}U$ , and mixing-zone thickness, $unicode[STIX]{x1D6FF}$ , to probe the role of initial conditions in mixing stages and the evolution of the scalar-field probability density function (p.d.f.) and variance. Scalar transport is calculated for unity Schmidt numbers, approximating gas-phase diffusion. The study is based on direct-numerical simulation (DNS) and large-eddy simulation (LES), comparing different subgrid-scale (SGS) models for incompressible, uniform-density, temporally evolving forced shear-layer flows. Moderate-Reynolds-number DNS results help assess and validate LES SGS models in terms of scalar-spectrum and mixing estimates, as well as other metrics, to $Re_{unicode[STIX]{x1D6FF}}lesssim 3.3times 10^{4}$ . High-Reynolds-number LES investigations to $Re_{unicode[STIX]{x1D6FF}}lesssim 5times 10^{5}$ help identify flow parameters and conditions that influence the evolution of scalar variance and p.d.f., e.g. marching versus non-marching. Initial conditions that generate shear flows with different mixing behaviour elucidate flow characteristics in each flow regime and identify elements that induce p.d.f. transition and scalar-variance behaviour. P.d.f. transition is found to be largely insensitive to local flow parameters, such as $Re_{unicode[STIX]{x1D6FF}}$ , or a previously proposed vortex-pairing parameter based on downstream distance, or other equivalent criteria. The present study also allows a quantitative comparison of LES SGS models in moderate- and high- $Re_{unicode[STIX]{x1D6FF}}$ forced shear-layer flows." @default.
- W2969372000 created "2019-08-29" @default.
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- W2969372000 date "2019-08-19" @default.
- W2969372000 modified "2023-10-02" @default.
- W2969372000 title "Turbulent shear-layer mixing: initial conditions, and direct-numerical and large-eddy simulations" @default.
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- W2969372000 doi "https://doi.org/10.1017/jfm.2019.591" @default.
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