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Turbulent Near Wake Behind An Infinitely Yawed Flat Plate

Electronic Theses of Indian Institute of Science

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Title Turbulent Near Wake Behind An Infinitely Yawed Flat Plate
 
Creator Subaschandar, N
 
Subject Aerodynamics
Turbulent Flow
Air Flow
Turbulent Near Wake
Turbulence Models
Wakes (Aerodynamics)
Yawing (Aerodynamics)
Plates (Engineering)
Turbulent Boundary Layer
Near Wake
Yawed Flat Plate
Wake Flow
Turbulent Wake
Flat Plate
 
Description Near wake is the region of wake flow just behind the trailing edge of the body where the flow is strongly influenced by the upstream flow conditions and also perhaps by the charac­teristics of the body. The present work is concerned with the study of the development of turbulent near wake behind an infinitely yawed flat plate. The turbulent near wake behind an infinitely yawed flat plate is the simplest of the three-dimensional turbulent near wake flows. The present study aims at providing a set of data on the turbulent near wake behind an infinitely yawed flat plate and also at understanding the development and structure of the near wake. Detailed measurements of mean and turbulent quantities have been made using 3-hole probe, X-wire and 3-wire hotwire probes.
Further an asymptotic analysis of the two-dimensional turbulent near wake flow has been formulated for the near wake behind an infinitely yawed flat plate. The feature that the near wake which is dominated by mixing of the oncoming turbulent boundary layer retains, to a large extent, the memory of the turbulent structure of the boundary layer, has been exploited to develop this analysis. The analysis leads to three regions of the wake flow (the inner near wake, the outer near wake and the far wake) for which the governing equations are derived. The matching conditions among these regions lead to logarithmic variations in both normal and longitudinal directions in the overlapping regions surrounding the inner wake. These features are validated by the present results.
A computational study involving seven well known turbulence models was also under­taken in order to assess the performance of the existing turbulence models in the prediction of the turbulent near wake behind an infinitely yawed flat plate. In this study all the seven models are implemented into a common flow solver code, thus eliminating the influence of grid size, initial conditions and different numerical schemes while making the comparison. This study shows that the K - e model performs better than other models in predicting the near wake behind an infinitely yawed flat plate.
 
Publisher Indian Institute of Science
 
Contributor Prabhu, A
 
Date 2005-09-20T09:00:00Z
2005-09-20T09:00:00Z
2005-09-20T09:00:00Z
1995-02
 
Type Electronic Thesis and Dissertation
 
Format 5833582 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/146
null
 
Language en
 
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