Abstract
The effects of roof shape on generation points of unsteady vortices and unsteady wind pressure on a body under a short-rise-time gust using a computational fluid dynamics (CFD) simulation with an LES model. The flow around flat roof, gable roof and hipped roof bodies subjected to a step-function-like gust was simulated. It was confirmed that the generation points of unsteady vortices around a body under a short-rise-time gust varied with its roof shape. The overshoot of wind pressure on the roof face was considerably large in the case of the gable roof body and wind direction of 45 degrees. On the other hand, the overshoot of wind pressure on the roof face of the flat roof body continued over a long period.
