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Numerical investigation of turbulence in a skewed three dimensional channel flow

Holstad, Anders
Doctoral thesis
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284058_FULLTEXT01.pdf (Locked)
URI
http://hdl.handle.net/11250/237686
Date
2009
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  • Institutt for marin teknikk [2885]
Abstract
The present doctoral thesis concerns fluid flow in three-dimensional turbulent boundary layers. In such flows, both the direction and the magnitude of the mean flow vary with wall distance. A statistically stationary turbulent shear layer was generated in a plane channel configuration where the mean three-dimensionality was achieved by means of a spanwise pressure gradient. Direct numerical simulations were performed to solve the incompressible Navier-Stokes equations. Reynolds-averaged statistics and details of the ensemble-averaged near-wall coherent vortices of the skewed flow field were presented. Results from a unidirectional reference flow were also presented. In particular, the impact of mean-flow three-dimensionality on coherent vortices with opposite sense of rotation was investigated. Asymmetries in the vortex pattern which are impossible in two-dimensional boundary layers were observed. A model has been proposed to interpret structure modifications in three-dimensional wall-flows.
Publisher
Norges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for marin teknikk
Series
Doktoravhandlinger ved NTNU, 1503-8181; 2009:179

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