Direct Numerical Simulation of a Turbulent Line Plume in a Confined Region

Abstract

We present direct numerical simulations (DNS) of a turbulent line plume in a confined region with adiabatic side, top and bottom walls. The plume originates from a line heat source of length, L, located at the centre of the bottom wall (z/H = 0) and rises until it impinges on the top wall (z/H = 1) and spreads laterally to produce a buoyant fluid layer. Since the region is confined, the continuous supply of buoyant fluid forces the layer downwards, until it reaches the bottom wall, where the flow is said to be the asymptotic state (Baines and Turner [1]). Presently, two Reynolds numbers, 3840 and 7680, are selected for plume lengths, L/H = 1, 2 and 4, where the Reynolds number of the plume i..