Review of numerical simulations for high-speed, turbulent cavity flows

Lawson, S. J.; Barakos, George N.

doi:10.1016/j.paerosci.2010.11.002

Cited by 228 publications

(129 citation statements)

References 164 publications

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“…As the reattachment point travels upstream due to lower channel velocities, flow will be advected directly into the cavity (Rathburn and Wohl, 2003). Thus, the mixing layer will not span the entire cavity length and a recirculation region will not encompass the entire cavity, as in an emergent lateral cavity (Shen and Floryan, 1985;Lawson and Barakos, 2011). The flow field will evolve from an emergent lateral cavity flow to a closed cavity flow.…”

Section: Pool Type 2: the Closed Lateral Cavitymentioning

confidence: 99%

A fluid-mechanics based classification scheme for surface transient storage in riverine environments: quantitatively separating surface from hyporheic transient storage

Jackson

Haggerty

Apte

2013

Hydrol. Earth Syst. Sci.

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Abstract. Surface transient storage (STS) and hyporheic transient storage (HTS) have functional significance in stream ecology and hydrology. Currently, tracer techniques couple STS and HTS effects on stream nutrient cycling; however, STS resides in localized areas of the surface stream and HTS resides in the hyporheic zone. These contrasting environments result in different storage and exchange mechanisms with the surface stream, which can yield contrasting results when comparing transient storage effects among morphologically diverse streams. We propose a fluid mechanics approach to quantitatively separate STS from HTS that involves classifying and studying different types of STS. As a starting point, a classification scheme is needed. This paper introduces a classification scheme that categorizes different STS in riverine systems based on their flow structure. Eight STS types are identified and some are subcategorized based on characteristic mean flow structure: (1) lateral cavities (emergent and submerged); (2) protruding in-channel flow obstructions (backward-and forward-facing step); (3) isolated in-channel flow obstructions (emergent and submerged); (4) cascades and riffles; (5) aquatic vegetation (emergent and submerged); (6) pools (vertically submerged cavity, closed cavity, and recirculating reservoir); (7) meander bends; and (8) confluence of streams. The long-term goal is to use the classification scheme presented to develop predictive mean residence times for different STS using fieldmeasurable hydromorphic parameters and obtain an effective STS mean residence time. The effective STS mean residence time can then be deconvolved from the transient storage residence time distribution (measured from a tracer test) to obtain an estimate of HTS mean residence time.

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Section: Pool Type 2: the Closed Lateral Cavitymentioning

confidence: 99%

A fluid-mechanics based classification scheme for surface transient storage in riverine environments: quantitatively separating surface from hyporheic transient storage

Jackson

Haggerty

Apte

2013

Hydrol. Earth Syst. Sci.

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“…These constants have the values 1.4, 0.25 and 0.57 respectively. The acoustic field around ideal cavities is well studied as documented in Lawson and Barakos [4]. However, the accurate prediction of the cavity acoustics can only be achieved by experiments or CFD which are expensive and time consuming.…”

Section: Introductionmentioning

confidence: 99%

Processing and analysis methods for transonic cavity flow

Loupy

Barakos

2017

Physics of Fluids

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This paper focuses on the localisation of noise sources in transonic cavity flows. Beamforming is used to estimate the pressure fluctuations inside a resonant transonic cavity, showing the localisation of the main sources of noise using an acoustic array and also combining it with a mean flow-field. The influence of the microphone array position, density, and shape are investigated. The presented method models the noise propagation with simple assumptions that are easily applicable to wind tunnel testing, and may help localise the noise sources from complex geometries without intrusive methods.

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“…Kavite geometrisi zaman bağlı türbülanslı akış alanının oluştuğu görece basit mühendislik yapılarıdır. Ancak kavite akış alanında oluşan "zamana bağlı değişkenlerin etkileşimleri karmaşık bir akış alanı" görüntüsü ortaya çıkartmaktadır [1].…”

Section: Introductionunclassified

Kavi̇te - Kanat Kesi̇ti̇ Etki̇leşi̇mi̇ni̇n Aeroakusti̇k Anali̇zi̇

Zafer¹,

Konan²

2017

deufmd

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Özet: Sunulan bu çalışmada zamana bağlı sıkıştırılamaz akış alanı ve aerodinamik temelli gürültü iki boyutlu kavite geometrisi için incelenmiştir. İki boyutlu zamana bağlı k-ε türbülans modeli farklı hücum açılı kanat kesiti ve θ-eğimli ön duvar için akış alanı çözümünde kullanılmıştır. Kavite geometrisi için hesaplanan sayısal akış alanı sonuçları deneysel veriler ile karşılaştırılmış ve doğrulanmıştır. Ffowcs William -Hawking (FW-H) Akustik Analojisi zamana bağlı akış alanı sonuçları girdi verisi olarak kullanılıp kavite gürültü seviyesi hesaplanmıştır. Kavite -kanat kesiti etkileşiminde pasif kontrol yöntemlerinin akustik sinyal üzerindeki etkisi çalışılmış ve sonuçlar karşılaştırılmıştır. Kavitekanat kesiti ve pasif kontrol mekanizmaları için elde edilen gürültü seviyeleri farklı konumlara yerleştirilmiş mikrofonlar ile incelenmiş ve akış alanı içinde oluşan zamana bağlı yapıların özellikle 0 -100 Hz aralığında akustik sinyale etkidiği tayin edilmiştir. Aeroacoustic Analysis of Cavity -Airfoil Interaction KeywordsCavity flow, Aeroacoustics, Pasive control, Acoustic analogy Abstract: In this study, unsteady incompressible flow field and aerodynamically generated noise of 2D cavity flows are investigated. In the case of 2D flow fields, unsteady standard k-ε turbulence model is used for flow field to observe for different angle of attack of under different front edge angles. Computed numerical results for cavity are compared and validated with experimental measurement. Unsteady flow fields results are used to compute a cavity noise using Ffowcs William -Hawking (FW-H) Acoustics Analogy. The effect of cavity -airfoil interaction with passive control on the acoustic signal is studied and results are compared.Computed noise levels for cavity -airfoil interaction and passive control mechanism are investigated for microphone which are located at different position and the effect of unsteady flow field structure on acoustic signal especially on the range of 0 -100 Hz are computed.

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Review of numerical simulations for high-speed, turbulent cavity flows

Cited by 228 publications

References 164 publications

A fluid-mechanics based classification scheme for surface transient storage in riverine environments: quantitatively separating surface from hyporheic transient storage

A fluid-mechanics based classification scheme for surface transient storage in riverine environments: quantitatively separating surface from hyporheic transient storage

Processing and analysis methods for transonic cavity flow

Kavi̇te - Kanat Kesi̇ti̇ Etki̇leşi̇mi̇ni̇n Aeroakusti̇k Anali̇zi̇

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