Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN Print: 1-56700-135-1

INFLUENCE OF BOUNDARY CONDITIONS ON THE LARGE-SCALE STRUCTURES IN TURBULENT PLANE COUETTE FLOW

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Magne Lygren Division of Applied Mechanics Norwegian University of Science and Technology N-7491 Trondheim, NORWAY

Helge I. Andersson Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Sinopsis

Two new sets of boundary conditions have been devised with the view to break the inflow−outflow coupling associated with periodic boundary conditions. This coupling is believed to play a significant role in the formation of large-scale structures found in numerically generated turbulent plane Couette flow. Direct numerical simulations are here performed in order to investigate the influence of the new boundary conditions on these large-scale structures. The effect of the boundary conditions was to shorten the streamwise lengthscale of the structures as well as reducing the inclination for roll cells to develop.

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