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Abstract
In this article, we report a numerical and experimental study of turbulent dispersion of a passive scalar released from a continuous ground-level point source in a staggered array of 16 × 16 cubical obstacles. Experimental measurements of the flow and dispersion were obtained in a boundary-layer water channel using laser-induced fluorescence (for concentration) and laser Doppler velocimetry (for velocity). Numerical simulations of the flow and scalar fields for this experimental configuration were performed using two in-house computer codes based on the Reynolds-averaged Navier-Stokes (RANS) method. Results of a detailed comparison between water-channel measurements and model predictions of the mean flow, turbulence kinetic energy, mean concentration, and concentration variance are presented. An advanced model for the concentration variance dissipation rate is validated in the new context of plume dispersion within and above a staggered array of cubical obstacles.
Notes
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