An object moving in a fluid experiences a drag force that depends on its velocity, shape and the properties of the medium. From this simplest case to the motion of a flock of birds or a school of fish, the drag forces and the hydrodynamic interactions determine the full dynamics of the system. Similar drag forces appear when a single projectile impacts and moves through a granular medium, and t...

We consider the 5d Kerr-AdS black hole as a gravity dual to rotating quark-gluon plasma. In holographic prescription we calculate drag force acting on heavy quark. According approach quark can be considered through string in dual. study dynamics of for backgrounds with one non-zero rotational parameter and two parameters that are equal magnitude. For case find good agreement prediction from 4d ...

Abstract Extreme ultraviolet (EUV) induced pulsed plasma is unique due to its transient characteristics: the switches between non-thermal state (when EUV power ON at beginning of pulse) and thermal (end pulse ∼20 μ s). It shown that although electron drag force acting on nm size particles in hydrogen negligible compared ion pulse, however it can be dominant end play important role particle tran...

This paper addresses the drag force and formation of vortices in the boundary layer of a Bose-Einstein condensate stirred by a laser beam following the experiments of Phys. Rev. Lett. 83, 2502 (1999)]. We make our analysis in the frame moving at constant speed where the beam is fixed. We find that there is always a drag around the laser beam. We also analyze the mechanism of vortex nucleation. ...