Wind, in the duration of its erosional process, affects considerable changes in a grain's morphologyfrom its removal (detachment) step to sedimentation. In other word, a grain undergoes its gradualevolution during the transit process. In this project, the maturation of Aeolian sand grains had beenstudied upon as based on texture maturity indicator which includes: sorting, mean size grain, round...

Exploring the attitudes of 185 respondents toward euthanasia, this 1990 cross-sectional pilot study utilized 12 survey questions addressing participants' demographic profiles and 18 focusing on: abortion; capital punishment; euthanasia; sterilization; and suicide. Cross-tabulation of structural, behavioral and attitudinal variables revealed age and education were the key factors in this study's...

This experimental work aims to investigate the manipulation of a bluff body flow with yaw angle 10° based on genetic algorithm optimization. Two loudspeakers are used generate zero-net mass-flux jets through streamwise slots, which span large portion rounded A-pillars body. The actuations produce maximum drag reduction 17% and 2% for leeward windward side control, respectively. has found two ty...

We propose a novel active-flow-control (AFC) strategy for bluff bodies to hide their hydrodynamic traces from predators. A group of windward-suction-leeward-blowing (WSLB) actuators are adopted control the wake circular cylinder submerged in uniform flow. An array velocity sensors deployed near provide feedback signals. Through data-driven deep reinforcement learning (DRL), effective strategies...

A study of dry ice growth on bundled (duplex) cylinders has been performed using icing wind tunnel experiments and computational fluid dynamics (CFD) numerical simulations. The aim this is to "fill the gaps" in works Wagner (2010) Qing et al. (2018). simulations cover a range possible conditions by varying operating speed, median volume diameter, for some cases-the angle incidence between cylin...

In order to study the mechanical properties of inverted cone bottom oil storage tanks under earthquakes when foundation is uneven, finite element modeling calculation for a 20,000 m3 tank carried out based on ANSYS Workbench. Wind load, hydraulic pressure and seismic load are all equalized as distributed loads with varying spatial positions. Considering various combinations different heterogene...

The present study investigates the impact of building façade geometrical details on pollutant transport mechanism in long street canyons. Large-eddy simulations (LES), extensively validated with experiments, are performed for four cases: (i) canyon without balconies, (ii) balconies at both windward and leeward façades, only (iv) façade. results show that can strongly affect wind flow field disp...

In order to improve the thermal protection performance of active system (TPS) based on spike and jet, an adjustable non-ablative system, which can be rotated in direction free stream, is proposed this paper. The mechanism optimal installation angle are analyzed by adopting numerical method. results show that attack has great influence peak heat flux hypersonic vehicles, dangerous point windward...

Investigating the wind-induced vibration response of greenhouse structure, and wind pressure distribution on its surface takes a critical significance when main structure is under large loads. A computational fluid dynamics-based study was conducted, tunnel tests were performed to structure. First, three types greenhouses, including Venlo, Round-arch, Saw-tooth type selected as design models fo...