The present paper examines the vortex-induced vibration (VIV) of a 5:1 rectangular cylinder with detached splitter in its near wake. tested gap ratio between and (g/D, where g is rear D depth cylinder) ranges from 0.5 to 2.0, an increment 0.5. To serve as reference case, without also under same conditions. test Reynolds number 32 320 56 507. This study delves into response, pressure distributions, power spectral densities (PSD) varying ratios. Based on qualitative quantitative analyses using...

The flow over two tandem cylinders is investigated with five different spacing ratios L/D = 1.25, 2.0, 3.5, 4.0, and 6.0 four chamfered-corner ξ B/D 0%, 5%, 10%, 15% at a Reynolds number Re 5300, where L, B, D are the distance between cylinders, chamfered corner dimension, cylinder width, respectively. This work aims to assimilate effects of on structures, vortex shedding, aerodynamic forces, Strouhal number, their relationships. We identified three patterns depending L/D: overshoot (L/D...

Self-efficacy is associated with health behavior and medication adherence in persons living HIV infection (PLWH). This paper describes self-efficacy, adherence, quality of life (QOL), it examines the relationships among these variables PLWH China. A cross-sectional survey 199 patients was completed using Self-Efficacy Questionnaire QOL for Chinese HIV-Infected Questionnaire. Medication measured through direct questioning pill-taking behavior. Results showed that self-efficacy disease...

In this study, wind tunnel experiments were carried out in smooth flow to examine the nexus between patterns around a flat-box section and its aerodynamics with variation of angle incidence (α). The model cross closely represents overall asymmetric geometry attendant class decks frequently employed long-span bridges. To explore associated aerodynamic properties that are distinct from typical symmetric (e.g., rectangular), detailed tests involving smoke-wire based visualizations synchronous...

The flapping dynamics of a flexible membrane (FM) and its effect on the flow fields over pressure fluctuations forward-facing step (FFS) have been investigated experimentally. two-dimensional FM with 40 mm in length 0.15 thickness was vertically attached to leading edge FFS height. deformation recorded by high-speed camera. Velocity data vertical central plane surface were measured planar particle image velocimetry sensors, respectively. results demonstrate that as dimensionless bending...

The internal weapon bay is widely used in modern aircraft; however, because the unsteady flows of cavity would cause dangerous store separation and intense aerodynamic noise, leading-edge spoiler an easy efficient passive flow-control method. flow control flat before a low-aspect-ratio flying-wing aircraft investigated based on numerical simulation. Numerical results show that completely changes flow; it obviously lifts up shear layer reduces pressure inside cavity. For from bay, very good...

The low temperature solid deposition characteristics of cold spraying technology are conducive to the remanufacturing/repair oxidation sensitive titanium alloy in atmosphere. Ti6Al4V deposits prepared by spray (CS) usually show porous microstructure due insufficient plastic deformation particles. interfacial bonding and microstructural evolution mechanisms particles during still unclear. In this study, were with nitrogen as process gas at a 800 °C pressure 4 MPa. micron CT results that...

The twin mountains, a common terrain in mountainous areas, tend to induce the acceleration effect under crosswinds, which enhances wind speed and turbulence performance of flow field. To mitigate impact on high-speed trains, structures, aircraft near this study investigates effectiveness jet strategies, are realized natural mountain slopes by mechanical ventilation, with different angles field train. Wind tests, visualization, prediction, research train's aerodynamic behavior conducted paper...

This study utilized wind tunnel experiments and large eddy simulations to profoundly investigate the aerodynamic characteristics flow patterns surrounding flat girders with different aspect ratios (B/D = 2, 4, 7, 10, where B D are length height of girder, respectively), which covers most engineering applications for typical long-span bridges. The test range angle attack (AOA) is [−12°, 12°]. Reynolds number Re, based on freestream velocity U∞ D, was approximately 70,900. results revealed...

This study presents an investigation to quantify the aerodynamics of truss bridge-girders via wind tunnel test and kriging surrogate model. Currently, conventional methods documented in design specifications only take into consideration mean drag force at null attack angle. To gain in-depth understanding on bridge-girders, experiments simplified bridge-girder models with various geometric parameters were carried out uniform flow. A total 15 aspect ratio (the width height) B/D = 1.0, 1.3,...

Hypersonic vehicles are drawing more and attention now for the near future, especially in low-altitudes space, from 20 km to 45 km. The reliable separation of protecting shroud hypersonic vehicle is a prerequisite critical issue success entire flight mission. unsteady multi-body characteristics flow at Mach 7.0 investigated based on numerical simulation this paper. improved delayed detached eddy (IDDES) method, dynamic hybrid overset mesh HLLE++ scheme used ensure accuracy. Numerical results...

A novel scheme to achieve three-dimensional (3D) target location in bistatic radar systems is evaluated. The proposed develops the additional information of radar, that transmit angles, estimate 3D coordinates targets by using multiple-input multiple-output techniques with a uniform circular array on and linear receive. azimuth, elevation angles receive cone angle are first extracted from data then calculated basis these angles. geometric dilution precision which based root Cramer-Rao bound...

Iron and model alloys containing 1, 2, 3wt% Si were reacted with dry wet CO2 gases at 800°C. All oxidised in according to approximately linear kinetics. Additions of H2O accelerated the reaction until steady-state parabolic kinetics achieved. However, effect was small stage Fe – 3Si. Alloy products a duplex scale consisting an outer FeO+Fe3O4 layer inner FeO+Fe2SiO4 layer, plus internal oxidation zone, all gases. In 1Si, amorphous SiO2 precipitates zone grew rod-like morphologies grown 2Si...

The acquisition of weak GPS signals is a challenging problem.The current methods for mainly depend on aiding, in which the receiver needs priori information from base-station to promote signal and tracking.It unavailable some remote locations since area may not be covered by base-station.On other hand, state-of-art unaided receivers, requires long Pre-detection Integration Time (PIT), such that computation complex time-consuming.This paper proposes computational efficient method speed up...