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Direct numerical simulation of separated flow in a three-dimensional diffuser

Published online by Cambridge University Press:  19 March 2010

JOHAN OHLSSON ,
PHILIPP SCHLATTER ,
PAUL F. FISCHER  and
DAN S. HENNINGSON
JOHAN OHLSSON*
Affiliation:
Linné Flow Centre, KTH Mechanics, Osquars Backe 18, SE-100 44 Stockholm, Sweden
PHILIPP SCHLATTER
Affiliation:
Linné Flow Centre, KTH Mechanics, Osquars Backe 18, SE-100 44 Stockholm, Sweden
PAUL F. FISCHER
Affiliation:
MCS, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
DAN S. HENNINGSON
Affiliation:
Linné Flow Centre, KTH Mechanics, Osquars Backe 18, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: johan@mech.kth.se
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Abstract

A direct numerical simulation (DNS) of turbulent flow in a three-dimensional diffuser at Re = 10000 (based on bulk velocity and inflow-duct height) was performed with a massively parallel high-order spectral element method running on up to 32768 processors. Accurate inflow condition is ensured through unsteady trip forcing and a long development section. Mean flow results are in good agreement with experimental data by Cherry et al. (Intl J. Heat Fluid Flow, vol. 29, 2008, pp. 803–811), in particular the separated region starting from one corner and gradually spreading to the top expanding diffuser wall. It is found that the corner vortices induced by the secondary flow in the duct persist into the diffuser, where they give rise to a dominant low-speed streak, due to a similar mechanism as the ‘lift-up effect’ in transitional shear flows, thus governing the separation behaviour. Well-resolved simulations of complex turbulent flows are thus possible even at realistic Reynolds numbers, providing accurate and detailed information about the flow physics. The available Reynolds stress budgets provide valuable references for future development of turbulence models.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 650 , 10 May 2010 , pp. 307 - 318
Copyright
Copyright © Cambridge University Press 2010

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References

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