Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595659
Title: Large-eddy simulation of wall-bounded flows subjected to curvature and rotation
Author: Guleren, Kursad Melih
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2007
Availability of Full Text:
Access through EThOS:
Abstract:
This PhD thesis considers the analysis and the interpretation of the complex turbulent flows subjected to curvature and rotation effects. To achieve this goal, largeeddy simulation (LES) is performed for various wall-bounded flow problems. For the validation and verification purposes, the adopted finite-volume code is tested by considering fully developed channel and duct flow problems. The behaviour of the subgrid-scale (SOS) models and the spatial schemes are investigated in detail for the channel and duct flows subjected to orthogonal rotation. Among the tested SOS models and the spatial schemes, the Wall-Adapting Local Eddy Viscosity (WALE) model and the bounded central differencing (BCD) scheme are found to perform the best. During the validation and verification processes, the turbulence mechanism in the channel and duct flows for various rotation rates are reviewed and the laminarization process due to Coriolis force is revealed by considering a wide range of data processing. Using the experience gained from the rotating channel and duct flow cases, more challenging flow cases are considered. The flow in the square-sectioned U-duct and the centrifugal compressor are simulated with LES at high Reynolds numbers. Predictions are extensively validated for both flow problems with the available experimental data. Grid convergence and appropriate near-wall resolutions are provided in order to avoid errors associated with the filter width and the wall functions. For both flow problems, Reynolds-averaged Navier-Stokes (RANS) results are included to determine the impact level of LES. Upon encouraging results obtained via LES, the effects of strong curvature and Coriolis forces are explored on mean, secondary flows and turbulence.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.595659  DOI: Not available
Share: