Jewkes, James, 1978- (2008) An improved turbulent boundary layer inflow condition, applied to the simulation of jets in cross-flow. PhD thesis, University of Warwick.

Preview

PDF WRAP_THESIS_Jewkes_2008.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (18Mb)

Abstract

The jet acting perpendicular to a cross-flow boundary layer is a commonly studied complex turbulent flow. Our research was motivated by their potential application in separation delay devices, where jets can be used to produce streamwise vortices in a similar manner to conventional solid vortex generating vanes. This thesis addresses two problems; firstly the generation of inflow conditions for the simulation of a spatially developing turbulent boundary layer, and secondly the simulation of low velocity ratio jets interacting with the boundary layer. Our approach involved refining a popular turbulent inflow generation technique, validating the accuracy of our improved method against well established direct numerical simulation data. This turbulent boundary layer was used to simulate a low velocity ratio perpendicular jet test-case, which was validated against experimental data. Finally, a pitched and skewed jet model was investigated. Our modifications to the turbulent boundary layer inflow generation method were successful, addressing problems described by various authors regarding the stability and accuracy of the technique. Secondly we have found excellent agreement in our perpendicular jet in cross flow test-case, and have produced what we believe to be the first documented unsteady numerical simulation of the flow field behind a low velocity ratio pitched and skewed jet.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QA Mathematics T Technology > TL Motor vehicles. Aeronautics. Astronautics
Library of Congress Subject Headings (LCSH):	Turbulent boundary layer -- Research, Aerodynamics -- Research, Jets -- Fluid dynamics, Cross-flow (Aerodynamics)
Date:	April 2008
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Carpenter, P. W. (Peter William), 1942- ; Chung, Yongmann
Sponsors:	Fifth Framework Programme (European Commission) (FFP) (G4RD-CT-2002-00748)
Format of File:	pdf
Extent:	209 leaves : ill., charts
Language:	eng
URI:	http://wrap.warwick.ac.uk/id/eprint/2372

Request changes to a record

Actions (login required)

View Item