Abstract
A thermal plume above a heated square on the earth ground in stably stratified air was formulated as a three-dimensional, time-dependent motion of the fluid with variable density and property, the Coriolis force, and the pressure as weight of air column. A direct numerical simulation (DNS) methodology was obtained. Computed results of plumes with and without the Coriolis force in neutrally or stably stratified air were shown, and three-dimensionality and time-dependency in those plumes were elucidated. The computed results were validated as follows : Features and differences between plumes without the Coriolis force in neutrally stratified air from the square and a point source were validated as reasonable. In stably stratified air, the computed plume without the Coriolis force showed the cross-over phenomenon and the time-dependent temperature with the constant maximum value, and agreed qualitatively with those of a plane plume. The computed plume with the Coriolis force in neutrally or stably stratified air was physically reasonable.
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