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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

FLOW TOPOLOGY IN A SQUARE ANNULAR DUCT

Stuart McIlwain
Department of Mechanical Engineering Queen's Univesity Kingston, ON, CANADA K7L 3N6

Hongyi Xu
Institute for Aerospace Research National Research Council Ottawa, ON, CANADA K1A 0R6

Andrew Pollard
Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario Canada K7L 3N6

Abstract

Flow topology techniques are applied to a large eddy simulation database of a square annular duct. The helicity density as well as the topology of the eddying motions are calculated as a function of time over the region of flow surrounding one of the inner duct corners. Turbulence structures are identified from the resulting isosurface plots. The structures are formed along the inner wall near the corner, and then transported diagonally away from the inner duct where they are stretched in the downstream direction by the mean flow field.