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Published in:
2010 | OriginalPaper | Chapter
Stochastically Forced Laminar Plane Couette Flow: Non-normality and Hydrodynamic Fluctuations
Authors : George Khujadze, Martin Oberlack, George Chagelishvili
Published in: Progress in Turbulence III
Publisher: Springer Berlin Heidelberg
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The background of three dimensional (3D) hydrodynamic/vortical fluctuations in a stochastically forced, laminar and incompressible plane Couette flow is simulated numerically. It was found that the fluctuating background in the flow has the following characteristics: The hydrodynamic fluctuations show the nonexponential, transient growth; an anisotropy of the fluctuating velocity field increases with the shear rate; existence of the streamwise structural regularities (coherent structures) with the characteristic length-scale of the order of a channel width; appearance of the nonzero velocity cross-correlations; Symmetry breaking of the spanwise reflection of the dynamical processes due to the stochastic forcing.