Natural ventilation, eruption columns and fires: Modelling steady and unsteady turbulent plumes, a talk by Dr John Craske (Research Fellow in Fluid Mechanics, Imperial College London)
Abstract
Turbulent plumes are free-shear flows driven by steady (time independent) or unsteady (time dependent) sources of momentum and buoyancy. Relatively simple integral models of plumes are useful in practical applications such as pollution modelling, fire modelling and the natural ventilation of buildings. The models are obtained by integrating the partial differential equations of motion (the Navier-Stokes equations) and invoking various assumptions. In this talk we will relax these assumptions and discuss plume theory from a more general perspective. In particular, we will derive generalised unsteady plume equations and demonstrate that they have mathematical properties and physical implications that have previously been overlooked. The talk will provide an overview of classical steady plume theory before considering planar and axisymmetric unsteady plumes.
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