Flow Excited Resonance of a Confined Shallow Cavity in Low Mach Number Flow and Its Control

Ziada, Samir; Ng, Hon Chai; Blake, C.

doi:10.1115/imece2002-33373

Cited by 10 publications

(11 citation statements)

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“…Strong resonant tones are observed near the intersections of the predicted Rossiter modes with both the transversal and the longitudinal acoustic modes. The observation of the interaction between Rossiter and transversal acoustic modes is similar to that of Ziada et al (2003) who explored low subsonic cavity flows. The work of Rossiter (1964), Rockwell & Naudascher (1978) and Williams et al (2000) all examined cavity flows for which the tunnel vertical dimension was significantly larger than the cavity length.…”

Section: Flow Characteristics and Reduced-order Model Resultssupporting

confidence: 73%

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Feedback control of subsonic cavity flows using reduced-order models

et al. 2007

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Development, experimental implementation, and the results of reduced-order model based feedback control of subsonic shallow cavity flows are presented and discussed. Particle image velocimetry (PIV) data and the proper orthogonal decomposition (POD) technique are used to extract the most energetic flow features or POD eigenmodes. The Galerkin projection of the Navier–Stokes equations onto these modes is used to derive a set of nonlinear ordinary differential equations, which govern the time evolution of the eigenmodes, for the controller design. Stochastic estimation is used to correlate surface pressure data with flow-field data and dynamic surface pressure measurements are used to estimate the state of the flow. Five sets of PIV snapshots of a Mach 0.3 cavity flow with a Reynolds number of 105 based on the cavity depth are used to derive five different reduced-order models for the controller design. One model uses only the snapshots from the baseline (unforced) flow while the other four models each use snapshots from the baseline flow combined with snapshots from an open-loop sinusoidal forcing case. Linear-quadratic optimal controllers based on these models are designed to reduce cavity flow resonance and are evaluated experimentally. The results obtained with feedback control show a significant attenuation of the resonant tone and a redistribution of the energy into other modes with smaller energy levels in both the flow and surface pressure spectra. This constitutes a significant improvement in comparison with the results obtained using open-loop forcing. These results affirm that reduced-order model based feedback control represents a formidable alternative to open-loop strategies in cavity flow control problems even in its current state of infancy.

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Section: Flow Characteristics and Reduced-order Model Resultssupporting

confidence: 73%

“…A similar interaction can also occur between Rossiter modes and the natural transversal cavity acoustic modes (e.g. Ziada, Ng & Blake 2003;. Recent theoretical models of cavity acoustic resonance based on edge scattering processes explain these behaviours (Kerschen & Tumin 2003;Alvarez, Kerschen & Tumin 2004;Alvarez & Kerschen 2005).…”

Section: Introductionmentioning

confidence: 85%

Feedback control of subsonic cavity flows using reduced-order models

et al. 2007

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“…The phenomenon, has been reported elsewhere and examples include bellows, orifice plates, corrugations, cavities and valves, see for example Jakubauskas and Weaver (1) and Ziada et al (2). The shedding is not necessarily correlated along the length of the riser.…”

Section: Theory and Definitionsmentioning

confidence: 69%

Full-Scale Testing of Flexible Riser System Subjected to Internal Flow-Induced Vibration

Every¹,

Goyder

Jee³

et al. 2006

Offshore Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractNoise and vibration in flexible riser production systems exporting dry gas can cause failure of small bore connections due to fatigue-induced vibration. The fundamental cause is vortex shedding within the corrugated, flexible riser. Small scale testing and Finite Element modeling have been used to demonstrate the extent of the problem and the conditions under which it might occur. These model results agreed with measurements which were made on the Schiehallion FPSO operating West of Shetland. A means has been developed and proved experimentally to test full scale equipment at operational dynamic and static pressures with a gas flow of natural gas. This methodology was used to test a replica of the Flow Termination Assembly currently deployed sub-sea on Schiehallion. The work showed that a fatigue failure was indeed possible, but the necessarily unfavourable condition had not occurred to date. We were able to show under what conditions it might occur and to explain why it had not occurred to date. Finally a means to mitigate the potential problem was developed, proved and deployed. The work allowed the continued operation of the export line without risk of fatigue failure and for the production flow rate to be safely, further increased.

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“…They associated this non-uniformity with the secondary stream-wise vortex structures, which, according to them contributed to the mixing of a passive scalar. Interest in high Mach number flows over cavities has prompted LES modelling [30] and a number of experimental studies [31][32][33][34][35][36][37]. These studies mainly focused on the acoustic feedback and control properties of cavity flows.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

Bhuiyan

Karim

Hart

et al. 2016

Experimental Thermal and Fluid Science

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This study presents the experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow. The flow field dynamics of a cavity type stagnation zone with a length to width ratio of 2 were studied. The cavity was driven by a channel flow with a Reynolds number of 1.8E5. The study utilized flow visualization, laser doppler velocimetry (LDV) and electrical conductivity probe measurements. Measurements of mean velocity and turbulence intensity profiles across the separated flow field showed the development of the shear layer and the recirculating flow pattern in the cavity. The numerical simulations were also performed for comparison with the experimental results considering the solution of the RANS, LES model and two-layer turbulence model. LES produced the formation and dynamics of coherent structures within the separated shear layer. Flow visualization revealed a pulsatile motion in the separated flow region associated with the formation and passage of coherent structures and was supported by measurements of tracer concentration. The study showed how coherent structures in the separated shear layer enhanced the mass transport process from the stagnation zone and how the recirculating flow in the cavity influenced the development of those structures.

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Flow Excited Resonance of a Confined Shallow Cavity in Low Mach Number Flow and Its Control

Cited by 10 publications

References 0 publications

Feedback control of subsonic cavity flows using reduced-order models

Feedback control of subsonic cavity flows using reduced-order models

Full-Scale Testing of Flexible Riser System Subjected to Internal Flow-Induced Vibration

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

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