Transient behavior in impinging jets in crossflow with application to downburst flows

Romanić, Djordje; LoTufo, Julien; Hangan, Horia

doi:10.1016/j.jweia.2018.11.020

Cited by 37 publications

(34 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Experiments Setup and Methodologymentioning

confidence: 99%

“…The jet centerline velocity at the bell mouth level in the DB and DBABL downdrafts were 12.3 and 11.8 m s −1 , respectively, whereas the ABL wind velocity at the height of the cylinder was 3.3 m s −1 . The selected configuration of two flows was chosen due to the minimal loss of jet momentum between DB and DBABL cases in this closed-circuit mode of the WindEEE Dome (Romanic et al, 2019). All investigated downbursts had a diameter of D = 3 . 2 m and the height of the test chamber was H = 3 . 8 m .…”

Section: Experiments Setup and Methodologymentioning

confidence: 99%

“…The velocity scales are typically between 1:1 and 1:4. This unique wind simulator is capable of simultaneously producing different ABL winds and downburst outflows (Romanic et al, 2019a) (Figure 1). Downburst-like outflows in the WindEEE Dome are created by closing the louvers on the bell mouth and pressurizing the upper plenum (Figure 1(b)).…”

Section: The Windeee Dome and Experiments Setupmentioning

confidence: 99%

“…The simultaneous downburst and ABL wind mode of the WindEEE Dome are similar to the isolated downburst mode, with the exception that the impinging jet is released into an already developed ABL wind ( Figure 1). Nine different momentum ratios of ABL winds and downburst impinging jets were recently investigated in Romanic et al (2019a). The ABL winds were generated by using 60 fans installed on one of six peripheral walls in the test chamber (Figure 1(a)).…”

Section: The Windeee Dome and Experiments Setupmentioning

confidence: 99%

See 3 more Smart Citations

Aerodynamic coefficients and pressure distribution on two circular cylinders with free end immersed in experimentally produced downburst-like outflows

Romanić

Ballestracci

Canepa

et al. 2020

Advances in Structural Engineering

Self Cite

View full text Add to dashboard Cite

Thunderstorms winds are localized and transient phenomena characterized by three-dimensional non-stationary velocity fields. While numerous studies investigated the wind loading on cantilevered structures under thunderstorm downburst winds, there is a lack of fundamental research on the behavior of simple circular cylinders subjected to downburst-like outflows. This paper investigates the pressure distribution and aerodynamic coefficients of two cylinders with different diameters immersed in three different types of wind: (1) isolated downburst (DB); (2) downburst embedded in an atmospheric boundary layer (ABL) wind (DBABL); and (3) steady ABL wind. The focus of this study is to provide a comparative analysis between aerodynamic coefficients (drag and lift) and surface pressures that result from these three different wind systems. The ABL winds caused a higher drag on the thinner cylinder than the two DB-like outflows. The lift coefficients during the primary vortex passage in the DB-like outflows were negative at the base of the cylinders and approached zero or to slightly positive values close to the cylinders’ top. The location of the cylinders in DB-like outflows is the dominant factor for their aerodynamics.

show abstract

Section: Experiments Setup and Methodologymentioning

confidence: 99%

Section: Experiments Setup and Methodologymentioning

confidence: 99%

Section: The Windeee Dome and Experiments Setupmentioning

confidence: 99%

Section: The Windeee Dome and Experiments Setupmentioning

confidence: 99%

See 2 more Smart Citations

Aerodynamic coefficients and pressure distribution on two circular cylinders with free end immersed in experimentally produced downburst-like outflows

Romanić

Ballestracci

Canepa

et al. 2020

Advances in Structural Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Meanwhile" "pulsed" jet simulators, generating rapid accelerations of flow at an outlet and reproducing transient flow features, have been utilized to examine simulated downburst wind fields (Romanic et al, 2019; and loading effects on various shapes and structures including cubes (Mason et al, 2005), low-, mid-and high-rise buildings (Jesson et al, 2015b;Jubayer et al, 2016), portal framed structures , and multi-spanned transmission lines . Modern facilities of this type such as the Wind Engineering Energy and Environment (WindEEE) Dome at Western University are capable of producing physically similar downdrafts up to a size of 4.5 m in diameter while translating at 2 m/s Jubayer et al, 2016;Romanic et al, 2019;. Others include the Microburst Simulator at Iowa State University (ISU) (Zhang et al, 2015) and the Transient Wind Simulator at the University of Birmingham (UoB), UK .…”

Section: Introduction To Wind Tunnel Experimentation For Nonstationarmentioning

confidence: 99%

Performance-based wind engineering framework for vertical structures subjected to nonstationary wind loads

Le¹

View full text Add to dashboard Cite

Regarded as a rational analytical approach that enables more risk-informed decision making, performance-based engineering (PBE) has been widely endorsed by the wind engineering community for the design and analysis of vibrationsensitive structures such as tall buildings. Accomplished through modular stages that delineate a structure's capacity to satisfy performance objectives, the uncertainties, error propagation, and random properties of the structural system, the environmental hazard, and the estimation of losses incurred from damages can be systematically examined with great detail. This multi-faceted, holistic approach vi Robert W. Bordewieck Endowed Engineering Fund provided by the College of Engineering of Northeastern University are gratefully acknowledged. Any opinions, findings and conclusions or recommendations are those of the Author and do not necessarily reflect the views of the NSF, MathWorks Inc.

show abstract

Full‐scale measurements of thunderstorm outflows in the Northern Mediterranean

Canepa,

Repetto,

Burlando

2024

Geoscience Data Journal

View full text Add to dashboard Cite

Downbursts are severe wind systems originating from thunderstorm clouds, and their strong horizontal outflows can pose serious hazards to natural and built environments. In the context of the activities of the European project THUNDERR—Detection, simulation, modelling and loading of thunderstorm outflows to design wind‐safer and cost‐efficient structures—a comprehensive database of full‐scale downburst measurements was built. All records were acquired by bi‐ or tri‐axial ultrasonic anemometers installed in the main ports of the High Tyrrhenian Sea, namely Genova, Livorno and La Spezia, within the European projects ‘Wind and Ports’ and ‘Wind, Ports and Sea’. The very limited space and time structure of downburst outflows makes the available records in nature inadequate for developing models that could be used in the atmospheric science and engineering communities. The database described herein represents a step forward in attempting to fill this gap. The downburst nature of all events contained in the dataset was verified through detailed meteorological analyses, including comparisons with radar and satellite images and lightning recordings. The wind speed records associated with the events detected by the anemometric network are made publicly available through the online repository Zenodo and can be reused for multiple purposes. The dataset is expected to convey an important impulse towards the physical characterization and modelling of downburst winds and their codification into design tools for the assessment of wind loading and its effects on structures and infrastructure. Furthermore, it could serve as a promising, essential tool for researchers and risk‐related insurance companies.

show abstract

Transient behavior in impinging jets in crossflow with application to downburst flows

Cited by 37 publications

References 53 publications

Aerodynamic coefficients and pressure distribution on two circular cylinders with free end immersed in experimentally produced downburst-like outflows

Aerodynamic coefficients and pressure distribution on two circular cylinders with free end immersed in experimentally produced downburst-like outflows

Performance-based wind engineering framework for vertical structures subjected to nonstationary wind loads

Full‐scale measurements of thunderstorm outflows in the Northern Mediterranean

Contact Info

Product

Resources

About