Numerical study of turbulent trailing-edge flows with base cavity effects using URANS

Do, T, Chen, L and Tu, J 2010, 'Numerical study of turbulent trailing-edge flows with base cavity effects using URANS', Journal of Fluids and Structures, vol. 26, no. 78, pp. 1155-1173.


Document type: Journal Article
Collection: Journal Articles

Title Numerical study of turbulent trailing-edge flows with base cavity effects using URANS
Author(s) Do, T
Chen, L
Tu, J
Year 2010
Journal name Journal of Fluids and Structures
Volume number 26
Issue number 78
Start page 1155
End page 1173
Total pages 19
Publisher Academic Press
Abstract Turbulent flows over lifting surfaces exhibiting trailing-edge vortex shedding often cause adverse and complex phenomena, such as self-induced vibration and noise. In this paper, a numerical study on flow past a blunt-edged two-dimensional NACA 0015 section and the same section with various base cavity shapes and sizes at high Reynolds numbers has been performed using the unsteady Reynolds-averaged Navier-Stokes (URANS) approach with the realisable ?- e turbulence model. The equations are solved using the control volume method of second-order accuracy in both spatial and time domains. The assessment of the application of URANS for periodic trailing-edge flow has shown that reasonable agreement is achieved for both the time-averaged and fluctuating parameters of interest, although some differences exist in the prediction of the near-wake streamwise velocity fluctuation magnitudes. The predicted Strouhal numbers of flows past the squared-off blunt configuration with varying degrees of bluntness agree well with published experimental measurements. It is found that the intensity of the vortex strengths at the trailing-edge is amplified when the degree of bluntness is increased, leading to an increase in the mean square pressure fluctuations. The numerical prediction shows that the presence of the base cavity at the trailing-edge does not change the inherent Strouhal number of the 2D section examined. However, it does have an apparent effect on the wake structure, local pressure fluctuations and the lift force fluctuations. It is observed that the size of the cavity has more influence on the periodic trailing-edge flow than its shape does.
Subject Computational Fluid Dynamics
Keyword(s) Base cavity
Trailing-edge flow
Unsteady RANS
Vortex shedding
DOI - identifier 10.1016/j.jfluidstructs.2010.07.006
Copyright notice Crown Copyright & 2010 Published by Elsevier Ltd. All rights reserved.
ISSN 0889-9746
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
Altmetric details:
Access Statistics: 82 Abstract Views  -  Detailed Statistics
Created: Mon, 07 Feb 2011, 07:34:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us