Direct numerical simulations of a turbulent spiral Poiseuille flow (SPF) in narrow-gap geometry at low Taylor number have been performed to analyse the reverse transition dynamics. The presently investigated SPF results from Taylor–Couette arrangement with rotating inner cylinder and stationary outer one, subject time-constant axial pressure gradient. Keeping fixed reducing Reynolds number, sev...

In this paper, the propagation of a second-order cylindrical vector beam in gradient-index and microstructured fibers is numerically simulated using RSoft Fullwave software. The beams are shown to be modes these fibers. calculated fundamental modes, regions found which there an energy flow directed oppositely direction (regions reverse flow). absolute value longitudinal component much lower tha...