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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2001

Volume 1 - CHT'01 - Advances in Computational Heat Transfer II
Proceedings of a Second Symposium - Palm Cove, Queensland, Australia, May 20 - 25, 2001

729 pages

APPLICATION OF TCL STRATEGY IN ENGINEERING AND ENVIRONMENTAL FLOWS

Tim J. Craft
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, UK

Brian E. Launder
School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, UK

ABSTRACT

The paper provides a review of the performance of UMIST's second-moment closure founded on Lumley's [3] two-component-limit principle. Developed in the late 1980's it has now been applied to a great range of difficult turbulent flows both near to and far from walls with or without force-field influences. While algebraically complex, the model is realizable and thus, in an iterative solution, it often requires less computing time than algebraically simpler forms. However, in strong stable stratification the flow is highly sensitive to second-moment diffusive transport: in these circumstances it may be necessary to adopt a third-moment closure to achieve satisfactory behaviour.