Abstract
This paper deals with conical vortices on a flat roof of a low-rise building when the incident flow is for oblique angle. A flow visualization technique is devised and presented that uses the inside space of the model as a mist reservoir. Flow patterns on a flat roof are investigated by means of flow visualizations with laser sheets and a strobe light. It is clarified that the sway of conical vortices is induced by the switching of vortices formed by separating flow. Also the exist of two pairs of vortices extended from the vertexes of the roof is pointed out.
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