UNSPECIFIED (2005) Unsteady turbulent flow with sudden pressure gradient changes. In: 8th ICFD Conference on Numerical Methods for Fluid Dynamics, Oxford Univ Comp Lab, Oxford, ENGLAND, 2004. Published in: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, 47 (8-9). pp. 925-930.

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Abstract

Direct numerical simulations are performed for a turbulent flow subjected to a sudden change in pressure gradient. The calculations are started from a fully developed turbulent channel flow at Re-tau = 180. The pressure gradient of the channel flow is then changed abruptly. The responses of the turbulence quantities (e.g. turbulence intensities, Reynolds shear stress, and vorticity fluctuations) and the near-wall turbulence structure to the pressure gradient change are investigated. It is found that there are two different relaxations: a fast relaxation at the early stage and a slow one at the later stage. The early response of the velocity fluctuations shows an anisotropic response to the near-wall turbulence. Copyright (c) 2005 John Wiley D Sons, Ltd.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software Q Science > QA Mathematics T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics
Journal or Publication Title:	INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
Publisher:	JOHN WILEY & SONS LTD
ISSN:	0271-2091
Date:	20 March 2005
Volume:	47
Number:	8-9
Number of Pages:	6
Page Range:	pp. 925-930
Identification Number:	10.1002/fld.917
Publication Status:	Published
Title of Event:	8th ICFD Conference on Numerical Methods for Fluid Dynamics
Location of Event:	Oxford Univ Comp Lab, Oxford, ENGLAND
Date(s) of Event:	2004
URI:	http://wrap.warwick.ac.uk/id/eprint/7260

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