One of the most important concerns aerosol‐jet based printing (AJP) is substantial amount overspray (OS) that can accompany printed traces. In this study, authors develop a full, three‐dimensional (3‐D) computational fluid dynamics (CFD) model aerosol carrier gas flow (CGF), is, confined by an annular sheath (ShGF) during AJP process. The then use to pinpoint fundamental mechanics principles control OS in standard process as function droplet size distribution and ShGF rate. their model,...

This paper investigates the flow dynamics around a square finite wall-mounted cylinder of two different aspect ratios (AR=H/D=6 and 10, H D are height width, respectively) under six boundary layer thickness (δ/D=0.5–4.0, δ is thickness) using improved delayed detached eddy simulation turbulence model. The Reynolds number based on width incoming velocity Re=1.4×104. aerodynamic force, surface mean fluctuating pressure, wake closure length, stresses, production, anisotropy analyzed in detail...

The propagation of the weak shock wave (WSW) to tunnel exits and their radiation as micro-pressure waves (MPWs) may cause sonic booms or structural resonance buildings, posing potential hazards humans, animals, buildings in exit's environment. characteristics WSW a maglev train/tube coupling model were studied based on two-dimensional axisymmetric unsteady Reynolds average Navier–Stokes turbulence model. In later stage MPW, formation mechanism, geometry, kinematic compressible vortex rings...

The turbulence intensity and yaw angle of crosswinds exert a substantial impact on the aerodynamic characteristics trains traveling in windy regions. It is urgent to study how incoming flow jointly affect train corresponding field under turbulent crosswind. A high-speed scaled at ratio 1/8 its actual size different angles was investigated. Three inflow conditions were adopted, including uniform inflow, Iu = 0.05 0.2 (Iu intensity). generated by synthetic eddy method. instantaneous time...

On-chip electrostatic discharge (ESD) protection design becomes a major challenge as IC technologies continue to migrate into very-deep-submicron (VDSM) regime. However, trial-and-error approaches still dominate in ESD circuit design. This paper discusses new mixed-mode simulation-design methodology, aiming prediction, which involves multiple-level coupling simulation by solving complex electrothermal equations self-consistently at process, device, and levels coupled fashion investigate...

Presents our work on automatic parking of a smart car that relies vision to estimate free slots. All problems involved in implementing an behavior are discussed. Solutions given together with experimental results obtained from real data.

This study attempts to describe associated fluid dynamics of a square finite wall-mounted cylinder (FWMC) immersed within free-stream turbulent flow characterized by different turbulence intensities and integral length scales. An improved delayed detached eddy simulation method is adopted numerically reproduce the fully developed fields. The results reveal that both scales have significant effect on separated shear layers, base pressure, aerodynamic forces cylinder. Constrained streamlines...

This paper discusses the development and validation of Smart Classroom Inventory (SCI). The SCI is derived from existing technology integration learning environment instruments, including TROFLEI, TICI CCEI (ergonomic). To accurately describe features smart classroom, factors flexibility, data, experience are added to SCI, description information usage some items also altered fit classroom environment. More than 640 11 15 years old students validated instrument, revealing ten scales:...

Turbulent incoming flow conditions are closely matched to the crosswinds experienced by trains in windy areas. Therefore, it is important investigate how turbulent inflow affects dynamics around a train. The aerodynamic characteristics of 1:8-scaled high-speed train at 90° yaw angle were studied based on improved delayed detached eddy simulation (IDDES) turbulence model. Four set using synthetic method (SEM) generator, including uniform, Lu = 0.5H, 1H, and 2H (Lu integral length scale H...

The effect of a free-stream turbulence intensity level on the wake dynamics square-back Ahmed body is modeled using improved delayed detached eddy simulation at Re=9.6×104. center pressure, pressure gradient base surface, and barycenter momentum deficit plane are analyzed to characterize bi-modality dynamics. Given that different flow have dominant frequencies, spectral proper orthogonal decomposition utilized separate bi-stability, pumping motion whole recirculation region, Von Kármán...

The transverse flow-induced vibration (FIV) of an elastically-supported cylinder-plate assembly (viz., a rigid splitter-plate attached to the downstream side circular cylinder) with low mass ratio 10 and zero structural damping is investigated using numerical simulations at Reynolds number 100. oscillations characteristics flow around structure are analyzed in terms fluid forces as function plate length LSP reduced velocity Ur. These investigations involve wide range lengths LSP/D = 0–4...

The high-speed trains traveling at 400 km/h will generate severe alternating pressure and potential sonic boom when passing through tunnels. This paper proposed foam metal hoods (FMH) to mitigate the waves induced by traversing 1:20 scaled moving-model experiments were conducted investigate mitigation mechanisms of FMH on micro-pressure (MPW), residual pressure, aerodynamic loads train tunnel. impact FMH's installation position length MPW discussed. results indicate that entrance can weaken...

Flow control of cylinders aimed at drag reduction or vibration suppression has been widely studied. Sweeping jet is a novel flow method that applied to airfoil and other bluff bodies. This paper numerically investigates the effects sweeping jets on cylinder Reynolds number 5 × 104 using large Eddy simulation. Various parameters such as angle, momentum coefficient, arrangement configuration fluidic oscillators are examined for their influence effectiveness. The results demonstrate...