Kazuhiro Otsubo

Numerical and Experimental Investigations on Unsteady Wind Pressure on a Gable Roof Body Under a Short-Rise-Time Gust

This paper reports on an investigation into the unsteady wind pressure measured on a gable roof body subjected to short-rise-time gusts in the wind tunnel compared with the results of a computational fluid dynamics (CFD) simulation using a large eddy simulation (LES) model, and the flow pattern around the body subjected to shortrise-time gusts. It was confirmed that the overshoot phenomena of wind pressure occurred on the gable roof body subjected to a short-rise-time gust by wind tunnel tests and CFD calculations. The peak value of wind pressure simulated by CFD matched well with that of the experimental result. It was found that a vortex was generated on the leeward roof face of the gable roof body under short-rise-time gusts, and the generation of this vortex caused the overshoot phenomenon of wind pressure on the leeward roof face.