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Predicting transitional separation bubbles

Predicting transitional separation bubbles
Predicting transitional separation bubbles
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.
Redford, John A.
10dd9919-76f3-4d3f-97b9-fe55c785bc58
Johnson, Mark W.
a9a712c7-626d-4880-be89-747d30ad5694
Redford, John A.
10dd9919-76f3-4d3f-97b9-fe55c785bc58
Johnson, Mark W.
a9a712c7-626d-4880-be89-747d30ad5694

Redford, John A. and Johnson, Mark W. (2004) Predicting transitional separation bubbles. TURBOEXPO 2004: International Gas Turbine Congress, Vienna, Austria. 13 - 16 Jun 2004.

Record type: Conference or Workshop Item (Paper)

Abstract

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.

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More information

Published date: 2004
Venue - Dates: TURBOEXPO 2004: International Gas Turbine Congress, Vienna, Austria, 2004-06-13 - 2004-06-16

Identifiers

Local EPrints ID: 23803
URI: http://eprints.soton.ac.uk/id/eprint/23803
PURE UUID: c54aff59-bd98-43ee-a71c-47e68f0944e5

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Date deposited: 01 Jun 2006
Last modified: 08 Jan 2022 09:52

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Contributors

Author: John A. Redford
Author: Mark W. Johnson

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