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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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For Online Access

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

MULTI-SCALE COMPUTATIONAL HEAT TRANSFER WITH MOVING SOLIDIFICATION BOUNDARIES

W. Shyy
Department of Aerospace Engineering, Mechanics & Engineering Science, University of Florida, Gainesville, FL 32611, USA

H. S. Udaykumar
Department of Mechanical Engineering, University of Iowa, Iowa City, IA 52242, USA

ABSTRACT

In order to develop computational strategies for solidification processing of engineering importance, one must address fundamental issues, including (i) a moving solid-fluid interface, (ii) geometrical complexities of both processing components and solid-fluid interfaces, and (iii) disparate scales in length and time, ranging from the dimension of the processing system, to the convection and diffusion scales, to the morphological scale, and to the capillary scale. Main implications from these observations are that dynamic similarity can not be maintained in virtually any scale-up processes, and, even for laminar flows, direct numerical simulation of a solidification problem can not be handled with current computing resources. In this article, we highlight recent efforts in developing suitable computational techniques to facilitate a multi-scale approach which handles micro-, meso-, and macro-scale phenomena in a coupled framework. Relevant modeling and computational techniques are summarized along with selected examples at macroscopic and morphological scales.