0
TECHNICAL PAPERS

Predicting Transitional Separation Bubbles

[+] Author and Article Information
John A. Redford, Mark W. Johnson

 Department of Engineering, University of Liverpool, Brownlow Hill, Liverpool, Merseyside L69 3GH, UK

J. Turbomach 127(3), 497-501 (Mar 01, 2004) (5 pages) doi:10.1115/1.1860573 History: Received October 01, 2003; Revised March 01, 2004

This paper describes the modifications made to a successful attached flow transition model to produce a model capable of predicting both attached and separated flow transition. This transition model is used in combination with the Fluent CFD software, which is used to compute the flow around the blade assuming that it remains entirely laminar. The transition model then determines the start of transition location and the development of the intermittency. These intermittency values weight the laminar and turbulent boundary layer profiles to obtain the resulting transitional boundary layer parameters. The ERCOFTAC T3L test cases are used to validate the predictions. The T3L blade is a flat plate with a semi-circular leading edge, which results in the formation of a separation bubble the length of which is strongly dependent on the transition process. Predictions were performed for five T3L test cases for differing free-stream turbulence levels and Reynolds numbers. For the majority of these test cases the measurements were accurately predicted.

FIGURES IN THIS ARTICLE
<>
Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 4

Predicted streamlines for laminar flow using Fluent

Grahic Jump Location
Figure 3

ERCOFTAC T3L transitional separation bubbles for a free-stream velocity of 5m∕s

Grahic Jump Location
Figure 2

Predicted near-wall gains for a boundary layer with a strong streamwise pressure gradient (H=7.7)

Grahic Jump Location
Figure 1

Predicted near-wall gains for a boundary layer with no streamwise pressure gradient

Grahic Jump Location
Figure 5

Transitional separation bubble results for a free-stream velocity of 5m∕s and a turbulence level of 5.7%

Grahic Jump Location
Figure 6

Transitional separation bubble results for a free-stream velocity of 5m∕s and a turbulence level of 2.4%

Grahic Jump Location
Figure 7

Variation in the number of turbulent spots through transition for a free-stream velocity of 5m∕s

Grahic Jump Location
Figure 8

Transitional separation bubble results for a free-stream velocity of 5m∕s and a turbulence level of 0.7%

Grahic Jump Location
Figure 9

Transitional separation bubble results for a free-stream velocity of 5m∕s and a turbulence level of 0.2%

Grahic Jump Location
Figure 10

Transitional separation bubble results for a free stream velocity of 2.5m∕s and a turbulence level of 2.4%

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In