Water seepage in concrete threatens the safety of marine constructions and reduces durability structures. This note presents a smart aggregate-based monitoring method to monitor travel time evolution harmonic stress wave during water infiltrating process An experimental investigation, which two plain columns were examined under different infiltration cases, verified validity proposed method. The test results show that is sensitive development decreases with increasing depth. active provides...

Abstract During high-speed rotation, the surface of aeronautic spiral bevel gears will generate significant pressure and viscous forces, which cause a certain amount windage power loss reduce efficiency transmission system. Based on computational fluid dynamics, this paper analyzes single gear pair under oil injection lubrication. In addition, shroud is used to suppress loss, clearance size opening angle designed are optimized. Finally, by comparing analyzing experimental results, following...

In implicit large eddy simulations, a porous material was used to suppress the noise produced by flow past an open cavity. The base case has Mach number and Reynolds based on cavity depth ReD = 105. Strong pressure fluctuations were produced. solid floor replaced high-pressure oscillations. With floor, both inside in near field substantially suppressed. Four controlled cases with different porosities considered. For low porosities, control better increasing porosity. best when porosity about...

The maximum spreading factor during droplet impact on a dry surface is pivotal parameter of range applications, including inkjet printing, anti-icing, and micro-droplet transportation. It determined by combination the inertial force, viscous tension, fluid–solid interaction. There are currently series qualitative quantitative prediction models for rooted in both momentum energy conservation. However, performance these consistent experimental samples remains ambiguous. In this work,...

To further simplify the bolt stress measurement process, feasibility of using a dual-mode electromagnetic acoustic transducer (EMAT) that excites both longitudinal and shear waves is investigated to achieve rapid accurate measurement. The propagation characteristics cylindrical guided in rod are studied by semi-analytical finite element (SAFE) model. Through combination theoretical formula simulation, nonuniform distribution axial directly used calculate time flight without building any...

An electromagnetic acoustic transducer (EMAT) is suitable for measuring the propagation time more accurately without causing abrasion to during testing due principle of its excitation. This work designs a flux-concentrating EMAT with radial-flux-focusing permanent magnet significantly enhance static magnetic field strength. Through theoretical analysis and finite element simulation, two kinds coils are designed according concentration areas horizontal vertical components field. One used...

Control of self-sustained oscillation and noise reduction poses a significant challenge. The present study employs Implicit Large Eddy Simulation at Mach number 0.85 to investigate the influence porous cavity floor on flow dynamics. By substituting solid with media, fundamental pressure–velocity relationship within medium is established according Darcy's law. Findings reveal marked suppression wall pulsations, accompanied by 10 dB decrease in sound pressure levels. induces blowing suction...

Abstract In developing heavy oil from thin bottom water reservoirs, horizontal wells are mostly used in Bohai Bay, China. To maximize production and avoid early coning/cresting, usually placed near the top of pay sands initially produced with small pressure drawdown. However, responses different display significant variations even though they operated under similar conditions. Some show premature coning rapid cut rising although high quality targeted, while others much delayed breakthrough...

Abstract To accurately simulate the motion characteristics of a reed valve and changes in flow field an exhaust chamber, fluid-structure coupling model electromagnetic direct drive air compressor during process was established simulated. The alteration within chamber is under examination. transient numerical simulation procedure conducted to reduce computational model's time complexity provide immediate analysis processThis paper explores effects altering lift relative pressure loss given...

Single-node cross fracture is the basic unit of discrete network. In this paper, flow characteristics oil-water two-phase in single-node model are investigated by experimental method. The was divided into sixteen groups according to different angles, oil and water phase rates were changed sequentially each group velocity controlled be low rate range all time during experiment. fluid process recorded experiment using high-speed camera results analyzed detail. Under condition flow, two phases...

Hydrostatic levelling system (HLS) is widely used to monitor the settlement of major projects, such as high‐speed railways, bridges, tunnels, dams, and nuclear power plants; ambient temperature most important influencing factor in actual engineering detection process. In order systematically study influence T A on test accuracy HLS, a platform was built laboratory, factors, including amount change, rate increase/decrease , expansion coefficient connecting pipe, distance measuring point, HLS...

The present work is concerned with the meshfree modelling of dynamic fracture in concrete.The Optimal Transportation Meshfree(OTM) method chosen for its numerous advantages such as exact mass transport, satisfaction continuity equation, linear and angular momentum conservation, consequently numerical problems spurious modes, tensile instabilities are resolved naturally.In addition, energy-based variational material point failure algorithm (Eigen-Erosion) employed to predict crack propagation...

At present it remains to address why the fast solar wind is and slow slow. Recently we have shown that field line curvature may substantially influence speed $v$, thereby offering an explanation for Arge et al. finding $v$ depends on more than just flow tube expansion factor. Here show by extensive numerical examples correlation between valid rather general base boundary conditions heating functions. Furthermore, effect of even pronounced when proton-alpha particle difference examined. We...