Show simple item record

contributor authorGuenther, Alex
contributor authorLamb, Brian
contributor authorStock, David
date accessioned2017-06-09T14:03:08Z
date available2017-06-09T14:03:08Z
date copyright1990/07/01
date issued1990
identifier issn0894-8763
identifier otherams-11575.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146818
description abstractPlume downwash at a large oil-gathering facility in the Prudhoe Bay, Alaska oil-field reservation was simulated in a series of numerical experiments. The purpose of this study was to investigate the potential of the numerical model as a means of assessing the impact of pollutants emitted from buoyant sources influenced by complex aerodynamic wakes. The model is a three-dimensional, Cartesian coordinate, finite difference code that solves the nonhydrostatic, time-averaged equations for the conservation of momentum and energy. The code uses a modified form of the standard first-order, two-equation (k??) engineering turbulence closure model. Wind tunnel and field investigations of dispersion at this arctic industrial complex indicate that dispersion is significantly influenced by building-generated airflow disturbances. We have used the numerical model to simulate directly the mean features of the flow field and dispersion from a buoyant source at an industrial site. The flow features varied depending on the size, number, and orientation of the buildings. A recirculation cavity was present in all model simulations and varied from 0.8 HB to 2 HB (building height). This agrees closely with results of wind tunnel studies. The model simulates a velocity defect of 0.6, a factor of 3.4 increase (relative to the approach flow) in turbulent kinetic energy (k), a factor of 5 increase in dissipation of k(?), and a 45% increase in turbulent viscosity at a downwind distance of 2 HB from the building. At a downwind distance of 5 HB, the plume rise of the simulated thermal plume decreased by 70% compared to the no-building case while the vertical and horizontal widths of the plume increased by 45% and 30%, respectively. These results generally reproduce the plume downwash and dispersion observed in wind tunnel and field investigations.
publisherAmerican Meteorological Society
titleThree-Dimensional Numerical Simulation of Plume Downwash with a k–ϵ Turbulence Model
typeJournal Paper
journal volume29
journal issue7
journal titleJournal of Applied Meteorology
identifier doi10.1175/1520-0450(1990)029<0633:TDNSOP>2.0.CO;2
journal fristpage633
journal lastpage643
treeJournal of Applied Meteorology:;1990:;volume( 029 ):;issue: 007
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record