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ACHIEVEMENTS AND LIMITATIONS IN MODELLlNG AND COMPUTATION OF BUOYANT TURBULENT FLOWS AND HEAT TRANSFER

K. Hanjalic
Department of Mechanical Engineering and Engineering Mechanics Michigan Technological University Houghton, MI 49931, USA

Abstract

Computational fluid dynamics, heat and mass transfer (CFD, CHMT) are emerging as major tools for predicting fluid flow, heat and mass transfer in complex industrial and environmental flow problems. For turbulent flows, the engineering computational methods solve statistically averaged transport equations, closed by a turbulence closure model. These models have become standard ingredients, but are often the major weaknesses of most CFD and CHMT packages, affecting their ultimate credibility. Successful predictions of a variety of complex flow and heat transfer problems have been reported. There are, however, certain types of flows and phenomena which still pose major uncertainties both numerically and physically. Among these are flows dominated by buoyancy, which have been regarded as intractable to modelling by most of the currently popular single-point turbulence models. This paper discusses some of the difficulties and controversial modelling issues within the framework of the second-moment closure, illustrates some of the recent achievements as well as some of the persistent failures in a range of test flows, and suggests some directions for future research.

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