different construction materials with different roughness used to make circular weirs highly affect surface roughness and, in turn, flow hydraulics passing over these structures.  in the present research, numerous experiments under different hydraulic conditions were performed on a physical model to study the effects of roughness on flow hydraulics over a circular weir. the flow hydraulics incl...

t-shape profile barriers are one of the most successful barriers among many different profiles. it has been shown that using welled diffusers on the top of t-shaped barriers makes a reactive barrier that shows better performance than that of any other used profile barriers compared with their equivalent absorbent barrier. the contribution of the top surface of reactive t-profile barriers to the...

In the present study, we propose a periodically rotating distributed forcing for turbulent flow over sphere its drag reduction. The blowing/suction is applied on finite slot of surface near separation, and unsteady sinusoidal velocities are azimuthally surface. This profile rotates in azimuthal direction time with frequency, satisfying instantaneous zero net mass flux. Reynolds number considere...

In this paper, the effects of using semi-active control strategy (such as MR dampers) in vehicle suspensions on the coupled vibrations of a vehicle traversing a bridge are examined in order to develop various designs of smart suspension systems for bridge-friendly vehicles. The bridge-vehicle coupled system is modeled as a simply supported beam traversed by a two-degree-of-freedom quarter-car m...

We propose a new transient model which naturally extends the sinusoidal model to nonstationary phenomena. An integrated online-offline segmentation approach is developed, followed by an explicitly time-variant sinusoidal model.