Navier-Stokes study of supersonic cavity flowfield with passive control

Kim, I.; Chokani, Ndaona

doi:10.2514/3.46147

Cited by 46 publications

(8 citation statements)

References 9 publications

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“…The conclusions on the effects of porous-inserts from this study are believed to be qualitatively correct, although quantitative information should be viewed with caution. Similar treatment for a porous surface has also been employed by Kim and Chokani [18].…”

Section: Modelling Of Porous Mediamentioning

confidence: 84%

“…The value of σ varies from one type of porous media to another. Here it is taken to be 0.607, which is equal to an experimentally determined value for an 11.2% porosity [18]. The value of p i can be adjusted in experiment by varying the pressure in a chamber behind a porous wall.…”

Section: Modelling Of Porous Mediamentioning

confidence: 99%

“…In the present conceptual study, a simple treatment of the porous media is desirable so that the simultaneous computation of the source and sound fields can be carried out using the hybrid LES -acoustic analogy approach. In order to model the effect of using porous media as cavity walls, a constant virtual back pressure is maintained inside the porous zones, similar to the method employed in [18]. It is then assumed that flow passing through the porous walls follows the linear Darcy pressure-velocity law as follows:…”

Section: Modelling Of Porous Mediamentioning

confidence: 99%

“…One example was provided by Kim and Chokani [18], who performed a two-dimensional numerical calculation using RANS and a zero-equation turbulence model for the cavity with porous floor. Their results confirmed the qualitative changes introduced by the porous medium.…”

Section: Introductionmentioning

confidence: 99%

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A Conceptual Study of Cavity Aeroacoustics Control Using Porous Media Inserts

Lai

Luo

2007

Flow Turbulence Combust

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In this study, an integrated flow simulation and aeroacoustics prediction methodology is applied to testing a sound control technique using porous inserts in an open cavity. Large eddy simulation (LES) combined with a three-dimensional Ffowcs Williams-Hawkings (FW-H) acoustic analogy is employed to predict the flow field, the acoustic sources and the sound radiation. The Darcy pressure -velocity law is applied to conceptually mimic the effect of porous media placed on the cavity floor and/or rear wall. Consequently, flow in the cavity could locally move in or out through these porous walls, depending on the local pressure differences. LES with "standard" subgrid-scale models for compressible flow is carried out to simulate the flow field covering the sound source and near fields, and the fully three-dimensional FW-H acoustic analogy is used to predict the sound field. The numerical results show that applying the conceptual porous media on cavity floor and/or rear wall could decrease the pressure fluctuations in the cavity and the sound pressure level in the far field. The amplitudes of the dominant oscillations (Rossiter modes) are suppressed and their frequencies are slightly modified. The dominant sound source is the transverse dipole term, which is significantly reduced due to the porous walls. As a result, the sound pressure in the far field is also suppressed. The preliminary study reveals that using porous-inserts is a promising technology for flow and sound radiation control.

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Section: Modelling Of Porous Mediamentioning

confidence: 84%

Section: Modelling Of Porous Mediamentioning

confidence: 99%

Section: Modelling Of Porous Mediamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Conceptual Study of Cavity Aeroacoustics Control Using Porous Media Inserts

Lai

Luo

2007

Flow Turbulence Combust

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“…-exp{-(* - (4) An initial location x u and relaxation length X were required to be provided. A location upstream of the shock/boundary-layer interaction region, where the eddy viscosity reached its equilibrium value, was selected as the initial location.…”

Section: Turbulence Modelmentioning

confidence: 99%

Hypersonic shockwave/turbulent boundary-layer interactions on a porous surface

Hanna

1995

AIAA Journal

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Nomenclature A = van Driest damping factor C = Darcy parameter D v = van Driest damping function p = pressure v = velocity normal to streamwise direction jc = distance measured from leading edge of flat plate x, = length of flat plate, 36 in. y -distance measured normal to the surface 8 = boundary-layer thickness A = relaxation length jL6 ; = eddy viscosity p = density T W = wall shear stress Received Dec. 20, 1994; presented as Paper 95-0005 at the AIAA 33rd Aerospace Sciences Meeting and Exhibit, Reno, NV, Jan. 9-12,1995; revision

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