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Nontrivial steady flows have recently been found that capture the mainstructures of the turbulent buffer layer. We study the effects of polymeraddition on these "exact coherent states" (ECS) in plane Couette flow. Despitethe simplicity of the ECS flows, these effects closely mirror those observedexperimentally: Structures shift to larger length scales, wall-normalfluctuations are suppressed while streamwise ones are enhanced, and drag isreduced. The mechanism underlying these effects is elucidated. These resultssuggest that the ECS are closely related to buffer layer turbulence.Comment: 5 pages, 3 figures, published version, Phys. Rev. Lett. 89, 208301  (2002

Toward a Structural Understanding of Turbulent Drag Reduction: Nonlinear Coherent States in Viscoelastic Shear Flows