Mechanical Engineering - Research Publications

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Author: Philip, Jimmy × Author: Ooi, Andrew × Author: George, Nitheesh × Start date: 2013 × End date: 2019 × Type: Conference Paper ×

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    Direct Numerical Simulation of Confined Wall Plumes
    George, N ; Philip, J ; Ooi, A (Australian fluid mechanics society, 2018)
    We present results from the direct numerical simulation (DNS) of a wall attached thermal plume in a confined box. The plume originates from a local line heat source of length, L, placed at the bottom left corner of the box. The Reynolds number of the wall plume, based on box height and buoyant velocity scale, is ReH = 14530 and a parametric study is carried out for boxes of two different aspect ratios (ratio of box width to box height) for a particular value of L. In the simulation, the plume develops along the vertical side wall while remaining attached to it before spreading across the top wall to form a buoyant fluid layer and eventually moving downwards and filling the whole box. Further, the original filling box model of Baines and Turner [1] is modified to incorporate the wall shear stress and the results from the DNS are compared against it. A reasonable agreement is observed for the volume and momentum fluxes in the quiescent uniform environment and also for the time-dependent buoyancy profile calculated far away from the plume.