The phenomenon of flow separation and reattachment over a backward facing step geometry is investigated in the turbulent regime (Reh = 5000) by means of particle image velocimetry (PIV). The arrangement of the water flow facility with controlled fluid temperature allows achieving a field sampling frequency twice the convective reference frequency, which is satisfactory for the large-scale fluct...

We report the observation of a current-driven metal (M)-insulator (I) phase oscillation in two-terminal devices incorporating individual WxV1-xO2 nanobeams connected to parallel shunt capacitors. The frequency of the phase oscillation reaches above 5 MHz for approximately 1 mum long devices. The M-I phase oscillation, which coincides with the charging/discharging of the capacitor, occurs throug...

The flow dynamics of small-width wall-attached jets generated by a Coand-effect nozzle is investigated unsteady Reynolds-averaged Navier–Stokes simulations. data are validated comparison with hot-wire velocity measurements performed on the same configurations. exhibit complex topology strongly influenced not only spanwise vorticity (as usually observed in wall jets) but also component normal to...

Herein, hydrodynamic analysis from a large-eddy simulation in Couette–Taylor–Poiseuille (CTP) geometry is numerically investigated. The present inspired by previous experimental work which heat transport phenomena were investigated recovery system devoted to rotary kiln facility. streamwise and spanwise components of the velocity Reynolds stress tensor are firstly validated using an benchmark. ...

Direct numerical simulations are performed to contrast turbulent boundary layers over a concave wall without and with free-stream turbulence. Adverse pressure gradient near the onset of curvature leads sharp decrease in skin friction intermittent separation. The presence turbulence reduces probability reverse flow, accelerates recovery layer downstream zero-pressure region, sustained appreciabl...

The dynamics of magnetization under the applied spin current is modeled by the generalized Landau-Lifshitz-Gilbert equation with a spin transfer torque term. Using matched asymptotic expansion with the domain wall thickness ǫ as the small parameter, we derive analytically the dynamic law for the domain wall motion induced by the spin current. We show that the domain wall driven by adiabatic cur...

We investigated the side-wall effects on turbulent bands in channel flow at transitional Reynolds numbers by direct numerical simulations using open source spectral-element code Nektar++. The width-to-height aspect ratio of 50:1 is considered for this study. Our study shows that can survive collision with side wall above bulk number Re≃1000 but decay below Re≃975, i.e. critical should be approx...

The objective of this study is to assess the capability convolution-based neural networks predict wall quantities in a turbulent open channel flow. first tests are performed by training fully-convolutional network (FCN) 2D velocity-fluctuation fields at inner-scaled wall-normal location $y^{+}_{\rm target}$, using sampled velocity fluctuations wall-parallel planes located farther from wall, inp...

The present work describes an experimental investigation that applies stereo particle image velocimetry in a cross-plane of turbulent channel flow is additionally perturbed by spanwise oscillatory body forces, induced plasma actuator and designed to mimic the effect wall oscillations. experiment aimed at retrieving forcing-correlated scales stochastic fluctuations for measured cross-plane. firs...