On the Use of Computational Fluid Dynamics to Investigate Aerosol Dispersion in an Industrial Environment: A Case Study |
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| Authors: | H E Fossum B A Pettersson Reif M Tutkun T Gjesdal |
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| Institution: | (1) Norwegian Defence Research Establishment (FFI), P. O. Box 25, N-2027 Kjeller, Norway;(2) Defence Research and Development Canada (DRDC), Suffield, P. O. Box 4000, Medicine Hat, Alberta, T1A 8K6, Canada;(3) Borregaard, P. O. Box 162, N-1701 Sarpsborg, Norway |
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| Abstract: | Aerosol dispersion in the area surrounding an existing biological treatment facility is investigated using large-eddy simulation,
with the objective to investigate the applicability of computational fluid dynamics to complex real-life problems. The aerosol
sources consist of two large aeration ponds that slowly diffuse aerosols into the atmosphere. These sources are modelled as
dilute concentrations of a non-buoyant non-reacting pollutant diffusing from two horizontal surfaces. The time frame of the
aerosol release is restricted to the order of minutes, justifying a statistically steady inlet boundary condition. The numerical
results are compared to wind-tunnel experiments for validation. The wind-tunnel flow characteristics resemble neutral atmospheric
conditions with a Reynolds number, based on the boundary-layer thickness, of Re
δ
≈ 2 × 105. The numerical inflow conditions are based upon the wind-tunnel flow field. The predicted decay of both the mean and root-mean-square
concentrations are in good agreement with experimental data; at 3 m from the ground, the plume mean concentration 200 m downwind
of the source is approximately 2% of the source strength. The numerical data in the near-surface layer (0–50 m from the ground)
correspond particularly well with the wind-tunnel data. Tentative deposition simulations suggest that there seems to be little
difference in the deposition rates of large (1.8 × 10−5 m) and small (3 × 10−6 m) particles in the near-field under the flow conditions considered. |
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