UNSPECIFIED. (2003) Computation of an unsteady complex geometry flow using novel non-linear turbulence models. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, 43 (9). pp. 979-1001. ISSN 0271-2091

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Abstract

Non-linear zonal turbulence models are applied to an unsteady complex geometry flow. These are generally found to marginally improve predicted turbulence intensities. However, relative to linear models, convergence is mostly difficult to achieve. Clipping of some non-linear Reynolds stress components is required along with velocity field smoothing or alternative measures. Smoothing is naturally achieved through multilevel convergence restriction operators. As a result of convergence difficulties, generally, non-linear model computational costs detract from accuracy gains. For standard Reynolds stress model results, again computational costs are prohibitive. Also, mean velocity profile data accuracies are found worse than for a simple mixing length model. Of the non-linear models considered, the explicit algebraic stress showed greatest promise with respect to accuracy and stability. However, even this shows around a 30% error in total (the sum of turbulence and unsteadiness) intensity. In strong contradiction to measurements the non-linear and Reynolds models predict quasi-steady flows. This is probably a key reason for the total intensity under-predictions. Use of LES in a non-linear model context might help remedy this modelling aspect. Copyright (C) 2003 John Wiley Sons, Ltd.

Item Type:	Journal Article
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:	30 November 2003
Volume:	43
Number:	9
Number of Pages:	25
Page Range:	pp. 979-1001
Identification Number:	10.1002/fld.518
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9154

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