Large Eddy simulation of tracer gas dispersion in a cavity
نویسندگان
چکیده
Abstract This paper assesses the prediction of inert tracer gas dispersion within a cavity height ( H ) 1.0 m, and unity aspect ratio, using large Eddy simulation (LES). The flow Reynolds number was 67 000, based on freestream velocity height. upstream laminar, producing shear layer which underwent transition to turbulence over cavity. Three distinct meshes are used, with grid spacings H / 100 (coarse), 200$?> 200 (intermediate), 400$?> 400 (fine) respectively. Smagorinsky, WALE, Germano-Lilly subgrid-scale models used each quantify effects modelling simulated flow. Coarsening led small changes in predicted field, substantial over-prediction concentration statistics. Quantitative metric analysis statistics showed that coarse simulations yielded results outside acceptable tolerances, while intermediate fine grids produced output. Interrogation fluid dynamics present evolution is heavily influenced by subgrid scale model. On development delayed, inhibiting entrainment mixing into layer, reducing removal from grid, developed more rapidly, resulting enhanced Concentration probability density functions accurately range, most probable value, towards both walls presented this show WALE may be advantageous standard Smagorinsky model for pollutant urban environment.
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چکیده ندارد.
15 صفحه اولInvestigations of Three- Dimensional Turbulent Cavity Flow Using Large Eddy Simulation Approach
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ژورنال
عنوان ژورنال: Fluid Dynamics Research
سال: 2022
ISSN: ['0169-5983', '1873-7005']
DOI: https://doi.org/10.1088/1873-7005/ac421b