The transport of moisture into the Arctic is tightly connected to midlatitude dynamics. We show that the bulk of the transient poleward moisture transport across 60◦N is driven by extreme transport (fluxes greater than the 90th percentile) events. We demonstrate that these events are closely related to the two types of Rossby wave breaking (RWB)—anticyclonic wave breaking (AWB) and cyclonic wav...

Flows around a wedge-shaped bow are simulated with the aim of investigating the wave breaking mechanism and small scale features of ship bow waves. The wedge geometry used in the experimental study of Waniewski et al. (2002) is chosen with the flow conditions at Re = 1.64×10 5 and Fr = 2.93. The bow wave structure, wave breaking process and air entrainment are studied. The predicted overall bow...

Numerical simulations describing plunging breakers including the splash-up phenomenon are presented. The motion is governed by the classical, incompressible, two-dimensional Navier-Stokes equation. The numerical modelling of this two-phase flow is based on a piecewise linear version of the volume of fluid method. Capillary effects are taken into account as a stress tensor computed from gradient...

Abstract The self-oscillating pulsed supercritical (SC)-CO 2 jet technology has higher pulse pressure and the resonant rock-breaking effect, which can improve drilling efficiency of development unconventional gas sources. impact frequency is key to resonance in coal rock mass; however, relationship between variation flow field remain unknown. This study investigates vortex change law effect on ...

Precursor emission has been observed in a non-negligible fraction of gamma-ray bursts.The time gap between the precursor and the main burst extends in some case up to hundreds of seconds, such as in GRB041219A, GRB050820A and GRB060124. Both the origin of the precursor and the large value of the time gap are controversial. Here we investigate the maximum possible time gaps arising from the jet ...

The present study proposes novel micro-jet impingement heat sink with effusion holes for flow extraction. The design consists of impingement nozzles surrounded by multiple effusion holes to take away the spent fluid. A three-dimensional numerical model is used for steady, incompressible, laminar flow and conjugate heat transfer for the performance analysis of the proposed design. The computatio...

High-efficiency rock breaking by hydraulic jetting is the key to radial horizontal drilling technology. In order improve efficiency of jet in wells, based on LS-Dyna display dynamics, a numerical simulation model single-nozzle was established analyze influence different nozzle parameters rock-breaking effect. Then, spin multi-nozzle bit established, and rotation speeds effect analyzed. Finally,...