Experimental and numerical investigation on steady blowing flow control within a compact inlet duct

Vaccaro, John C.; Elimelech, Yossef; Chen, Yi; Sahni, Onkar; Jansen, Kenneth E.; Amitay, Michael

doi:10.1016/j.ijheatfluidflow.2015.05.011

Cited by 20 publications

(12 citation statements)

References 31 publications

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“…PHASTA solves the Navier-Stokes [36,37] equations either directly (DNS) or after turbulence modeling [38] using a stabilized finite element method. It has scaled to over 3M processes [39] on applications ranging from fundamental science benchmarks like channel flow [40] to more complex systems like aircraft [41,42], cardiovascular systems [43,44] and multiphase flow [45,46]. It is an open source code [47] led by K.E.…”

Section: Phasta Science Applicationmentioning

confidence: 99%

Performance Analysis, Design Considerations, and Applications of Extreme-Scale In Situ Infrastructures

Ayachit

Bauer

Duque

et al. 2016

SC16: International Conference for High Performance Computing, Networking, Storage and Analysis

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Abstract-A key trend facing extreme-scale computational science is the widening gap between computational and I/O rates, and the challenge that follows is how to best gain insight from simulation data when it is increasingly impractical to save it to persistent storage for subsequent visual exploration and analysis. One approach to this challenge is centered around the idea of in situ processing, where visualization and analysis processing is performed while data is still resident in memory. This paper examines several key design and performance issues related to the idea of in situ processing at extreme scale on modern platforms: scalability, overhead, performance measurement and analysis, comparison and contrast with a traditional post hoc approach, and interfacing with simulation codes. We illustrate these principles in practice with studies, conducted on large-scale HPC platforms, that include a miniapplication and multiple science application codes, one of which demonstrates in situ methods in use at greater than 1M-way concurrency.

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Section: Phasta Science Applicationmentioning

confidence: 99%

Performance Analysis, Design Considerations, and Applications of Extreme-Scale In Situ Infrastructures

Ayachit

Bauer

Duque

et al. 2016

SC16: International Conference for High Performance Computing, Networking, Storage and Analysis

Self Cite

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“…Due to this, large S-duct curvatures are avoided where possible. 6 However, there are many motivations for the use of high offset/curvature S-ducts. The first of these is space constraints and weight savings.…”

Section: Introductionmentioning

confidence: 99%

“…2 Current UAVs are another case in point, as the length of the propulsion system is currently dictating the overall size of the aircraft. 6 High curvature ducts are also useful for the reduction of an aircraft's radar cross section (RCS) -low RCS intake design necessitates 100% line-of-sight blockage of the engine fan rotor. 7 Examples of this on combat aircraft are the Lockheed-Martin F-22 Raptor and F-35 Lightning II.…”

Section: Introductionmentioning

confidence: 99%

Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control

Hickling

Ingram

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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S-duct diffusers are used in aircraft with embedded engines to route ambient air to the fan face. Sizing and stealth considerations drive a need for high curvature ducts, but the curvature causes complex secondary flows that lead to total pressure distortion and swirl velocities at the engine face. These must be controlled for stable engine operation. In this paper, tubercles, a novel bio-inspired passive flow control method, are analysed numerically in a duct with transonic flow. The results are compared to experimental data obtained as part of a campaign at the Royal Military College, Canada to investigate the effects of S-duct geometry and novel passive flow control devices on the performance of transonic S-ducts. The performance of Reynolds-averaged Navier–Stokes turbulence models in the S-ducts is assessed – Menter's shear stress transport model predicts excessive losses due to the overactivity of its stress limiter. The realisable k–ɛ model gives a significant improvement in the prediction of static pressure distributions, but losses and distortion characteristics are predicted poorly due to the model's inability to resolve the effects of unsteadiness in separated regions. Large tubercle geometries are found to trigger earlier separation in the centre of the duct by concentrating low momentum fluid in valleys, but they also act as boundary layer fences away from the duct centre. Smaller geometries are found to generate vortices that re-energise the boundary layer, delaying flow separation. Methods are recommended for future computational analyses of S-ducts and new designs of tubercles.

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“…In addition to steady-state analysis, time-resolved, dynamic analysis has been conducted in internal flows. Vaccaro et al [16] performed a combined experimental and numerical study of tangential jets in an aggressive, rectangular sduct at a free-stream Mach number of 0.44, and found the actuation to eliminate energy content of distinct unsteady spectral features in the base flow. Recently, Garnier [17] performed spectral analysis on radial and circumferential distortion and total pressure fluctuations at the diffuser AIP to study the unsteady effect of continuous and pulsed blowing at M AIP = 0.2-0.4.…”

Section: Introductionmentioning

confidence: 99%

Flow Dynamics Effected by Active Flow Control in an Offset Diffuser

Burrows

Vukašinović

Glezer

2018

2018 Flow Control Conference

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Experimental and numerical investigation on steady blowing flow control within a compact inlet duct

Cited by 20 publications

References 31 publications

Performance Analysis, Design Considerations, and Applications of Extreme-Scale In Situ Infrastructures

Performance Analysis, Design Considerations, and Applications of Extreme-Scale In Situ Infrastructures

Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control

Flow Dynamics Effected by Active Flow Control in an Offset Diffuser

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