✦ LIBER ✦

Fires in inclined trenches: time-varying features of the attached plume

✍ Scribed by P.J. Woodburn; D.D. Drysdale

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 202 KB
Volume: 31
Category: Article
ISSN: 0379-7112
DOI: 10.1016/s0379-7112(98)00003-4

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✦ Synopsis

Two-dimensional, time-dependent, laminar computational fluids dynamics (CFD) simulations of the time-dependent flows generated by fires in inclined trenches were carried out to investigate the time-varying aspects of the flow. In the simulations of a plume from a fire attached to the floor of a trench inclined steeper than the critical angle, vortices, originating as waves in the unstable density gradient above the burner, were convected away from the burner causing oscillations in temperature and velocity within the flow downstream of the burner. The magnitude of these oscillations in both temperature and velocity was a significant fraction of the mean flow values. The vortices merged as they moved downstream, giving a reduction in the oscillation frequency with downstream distance from the burner. These features, which were previously observed in experiments. [

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