Numerical Investigation of Effects of Two-Dimensional Thermal Plumes on Cross-Flow

Engineers Australia
Publication Type:
Conference Proceeding
CD Proceedings of the 9th National Conference on Hydraulics in Water Engineering, 2008, pp. 1 - 7
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Numerical investigation of the effects of thermal plumes rising from a heated horizontal plate positioned on the floor in a cross-flow is conducted, using a commercial Computational Fluid Dynamics (CFD) software package. A two-dimensional flow configuration of fresh water is assumed, and the low-Reynoldsnumber turbulence model of Chien is used. The effects are characterised by an angle theta above the horizontal of the interface between the original cross-flow and a second, negative cross-flow that is induced from downstream of the plate. It is shown that .. correlates quite well with the cross-flow Froude number Fr, decreasing linearly with a mild slope (on a log-linear plot) with increasing Fr, when this is less than about 0.08. A sharp drop of theta follows, to reach and remain at zero, for Fr larger than about 0.1. This study thus shows that at low Fr, crossflow can not reach large regions of the flow field. The situation is reversed when Fr is larger than about 0.1; then, the cross-flow reaches virtually all parts of the flow field.
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