Smoke Transport by Sheared Winds.
Smoke Transport by Sheared Winds.
(1347 K)
Trelles, J. J.; McGrattan, K. B.; Baum, H. R.
Combustion Theory and Modelling, Vol. 3, 323-341, 1999.
Keywords:
smoke transport; wind effects; buoyant plumes; large
eddy simulation; regional meteorology; fire plumes; fire
behavior; mathematical models
Abstract:
The effect that the wind's vertical variation has on
fire plume behaviour is investigated. A parabolized set
of governing equations are discretized using finite
differences to arrive at the numerical model.
Lagrangian particles are used to visualize the flow,
account for atmospheric fluctuations and determine the
smoke concentration field. A parametric study based on
varying the wind lapse rate is performed. Four cases
from actual soundings are analysed with both the actual
and an averaged constant wind. The results suggest that
an increasing wind profile suppresses plume dynamics,
leading to decreased plume rise heights.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899