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      Spectral Properties of Dynamical Systems, Model Reduction and Decompositions

      Nonlinear Dynamics
      Springer Nature

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          Hydrodynamic stability without eigenvalues.

          Fluid flows that are smooth at low speeds become unstable and then turbulent at higher speeds. This phenomenon has traditionally been investigated by linearizing the equations of flow and testing for unstable eigenvalues of the linearized problem, but the results of such investigations agree poorly in many cases with experiments. Nevertheless, linear effects play a central role in hydrodynamic instability. A reconciliation of these findings with the traditional analysis is presented based on the "pseudospectra" of the linearized problem, which imply that small perturbations to the smooth flow may be amplified by factors on the order of 10(5) by a linear mechanism even though all the eigenmodes decay monotonically. The methods suggested here apply also to other problems in the mathematical sciences that involve nonorthogonal eigenfunctions.
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            Turbulence, Coherent Structures, Dynamical Systems and Symmetry

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              Three‐dimensional optimal perturbations in viscous shear flow

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                Author and article information

                Journal
                Nonlinear Dynamics
                Nonlinear Dyn
                Springer Nature
                0924-090X
                1573-269X
                August 2005
                August 2005
                : 41
                : 1-3
                : 309-325
                Article
                10.1007/s11071-005-2824-x
                caf4bdce-c71f-475c-85b6-cdf2c794da03
                © 2005
                History

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