It is widely acknowledged that the use of helical strakes for mitigation of vortex-induced motions (VIM) of surface piercing cylinders, such as spar platforms, is only partially effective. Using computational fluid dynamics tools, we compare the oscillation characteristics of a bare cylinder and a straked cylinder in uniform currents. Our model comprised of a straked cylinder with diameter of 0...

This article investigates unsteady magnetohydrodynamic (MHD) mixed convective and thermally radiative Jeffrey nanofluid flow in view of a vertical stretchable cylinder with radiation absorption heat; the reservoir was addressed. The mathematical formulation is established based on theory boundary layer approximations pioneered by Prandtl. governing model expressions partial differential equatio...

Droplet collisions on superhydrophobic cylindrical surfaces are widely seen in industrial applications. To investigate their dynamic behavior, numerical simulations of droplets impacting eccentrically the surface a small cylinder performed this work. The eccentricity e ranges from 0 to 1.2 mm, and impact velocity 0.5 2 m/s. effects studied detail. results show that increasing reduces maximum sp...

The theoretical foundations of the boundary integral method are considered for inviscid monochromatic internal waves, and an analytical approach is presented solution equation oscillating bodies simple shape: elliptic cylinder in two dimensions, a spheroid three dimensions. combines coordinate stretching introduced by Bryan Hurley frequency range evanescent with analytic continuation to propaga...

In this paper, the physical origin of vortex stretching and twisting is theoretically investigated. The effects inertial viscous forces are mainly considered discussed. Two key conditions, i.e., solid walls three-dimensional (3D) disturbances, adopted in three typical cases. Among them, first two cases straight curved lines at initial time without any kind disturbance. third case a line with in...