UNSPECIFIED (2001) URANS computations for a complex internal isothermal flow. COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 190 (22-23). pp. 2893-2907. ISSN 0045-7825

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Abstract

Unsteady Reynolds Averaged Navier-Stokes (URANS) computations for an idealized electronic system are considered. Comparison is made between new Laser Doppler Anemometry (LDA) measurements and finite volume predictions involving nine turbulence models. Zero, one and two equation models are tested. Some of these utilize zonal methods and one, non-linear eddy viscosity relations. For velocity components, reasonable agreement is found between measurements and predictions. Overall, the zonal models gave an average error of just less the 15% when compared to velocity measurements. The measurements have an estimated +/-5% error. The turbulence models are found to give dramatically different turbulence intensities. These, in turn, give significant variations in the predicted temporal behaviour. Unlike, as suggested by measurements, predicted unsteady flow component amplitudes are found negligible relative to stochastic turbulent components. For velocities, the accuracy of the standard k-epsilon model is found worse (by around 4%) than that of a simple mixing length model. Results suggest the former is excessively diffusive. Overall, the zonal models show greatest accuracy. However, for intensities, even these predictions differ significantly (on average 28%) from measurements. (C) 2001 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) Q Science > QA Mathematics T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Publisher:	ELSEVIER SCIENCE SA
ISSN:	0045-7825
Date:	2001
Volume:	190
Number:	22-23
Number of Pages:	15
Page Range:	pp. 2893-2907
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/12343

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