Numerical Simulation of the Effect of a Single Gust on the Flow Past a Square Cylinder

The flow past a square cylinder under the influence of one dimensional gust was investigated using computational fluid dynamics (CFD). effect upstream wind gusts same amplitude but different duration with respect to their on flow, vortex-shedding, and pressure distribution around cylinder. For computations, very large eddy simulation (VLES) model implemented in an in-house code validated against numerical experimental results from literature. were found have distinctly effect. short-duration causes lock-on behavior cessation alternating vortex shedding, symmetric pair-vortex created above below It observed that lateral sides has magnitude phase, which resulted zero total lift coefficient. In terms free-standing structures, such as building, this would lead instantaneous forces difference direction obvious implications for dynamic response cross ventilation.