Turbulent Flow Over An Embedded Rectangular Cavity

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Turbulent Flow Over An Embedded Rectangular Cavity

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Author : George D. Catalano
language : en
Publisher:
Release Date : 1987

Turbulent Flow Over An Embedded Rectangular Cavity written by George D. Catalano and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.

A numerical, discrete vortex model is developed for flow over an embedded rectangular cavity, with the separation of the shear layer at the leading edge replaced by periodic insertion of point vortices. The results of the vortex model are compared to the data obtained from an experimental investigation carried out at a free stream speed of 6 m/sec past a rectangular cavity of depth, D equal to 5 cm; a depth-to-width ratio, D/W equal to 1.0 and length-to-depth ratio, L/D, equal to 4.0. The Reynolds numbers based on the cavity depth is approximately 2x 104. Mean velocity, and turbulent intensity, profiles are presented. Evidence of the three dimensional nature of the flow has been obtained via oil film and tuft flow visualization techniques. Discrepancies between the model predictions and the experimental results are discussed as are differences between the 3-D flow field examined here and previous infinite span, 2-D, cavity configurations. Additionally, a mechanism is developed for the inclusion in the vortex model of various initial separation conditions.

Turbulent Flow In A Rectangular Cavity

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Author : Nisim Hazan
language : en
Publisher:
Release Date : 1980

Turbulent Flow In A Rectangular Cavity written by Nisim Hazan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Jets categories.

Nasa Technical Memorandum

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Author :
language : en
Publisher:
Release Date : 1990

Nasa Technical Memorandum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.

Nasa Technical Paper

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Author :
language : en
Publisher:
Release Date : 1991

Nasa Technical Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Astronautics categories.

Nasa Technical Paper

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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1991

Nasa Technical Paper written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Characterization Of Cavity Flow Fields Using Pressure Data Obtained In The Langley 0 3 Meter Transonic Cryogenic Tunnel

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Author : Maureen B. Tracy
language : en
Publisher:
Release Date : 1993

Characterization Of Cavity Flow Fields Using Pressure Data Obtained In The Langley 0 3 Meter Transonic Cryogenic Tunnel written by Maureen B. Tracy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aerodynamics, Transonic categories.

Numerical Studies Of Buoyancy Driven Turbulent Flow In A Rectangular Cavity

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Author : C. P. Thompson
language : en
Publisher:
Release Date : 1985

Numerical Studies Of Buoyancy Driven Turbulent Flow In A Rectangular Cavity written by C. P. Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.

The Effect Of Depth On A Three Dimensional Rectangular Cavity In Subsonic Flow

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Author :
language : en
Publisher:
Release Date : 2001

The Effect Of Depth On A Three Dimensional Rectangular Cavity In Subsonic Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

A cavity was inserted into a 20 m/s subsonic flow. The flow had a freestream turbulence level of 0.5%. The cavity had an aspect ratio of 2.0 and was capable of reaching depths from 0.0 to 2.35L. Velocity and turbulence measurements were acquired in the shear layer over the cavity and upstream of the cavity in the approaching boundary layer using hotwire anemometry. These measurements showed that the approaching boundary layer approximated a universal fully turbulent boundary layer. The hotwire was also used to acquire energy spectra in the boundary and free shear layers as well as in the freestream in order to examine the frequency content of the flow. Finally condenser microphones were installed into the cavity and used to acquire energy spectra by measuring the unsteady pressure inside the cavity at various locations. Significant effort was made to identify the causes for each mode. The author has found evidence to suggest that tones generated by the cavity can be driven either acoustically or fluid dynamically. However, acoustics appear to dominate in the current cavity geometry and the current flow speed. The data acquired agrees well with past experiments. However, several new trends were noted that the author has not found mentioned in past work. First, shear layer velocity and turbulence profiles indicate the presence of a recirculation region at the upstream cavity lip. Second, relative sound pressure levels indicate that the total energy inside the cavity decreases as depth increases from D/L = 0.5 to 2.1. This loss of energy coincides with an increase in energy in the shear and boundary layers at the same depths. However, at cavity depths greater than D/L = 2.1 the trend reverses itself as a second vortex cell begins to form beneath the primary vortex.

Numerical Methods In Laminar And Turbulent Flow

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Author :
language : en
Publisher:
Release Date : 1987

Numerical Methods In Laminar And Turbulent Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Fluid dynamics categories.