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Article
Transition to Turbulence, Small Disturbances, and Sensitivity Analysis II: The Navier-Stokes Equations
Journal of Mathematical Analysis and Applications
  • John R. Singler, Missouri University of Science and Technology
Abstract
Recent research has shown that small disturbances in the linearized Navier-Stokes equations cause large energy growth in solutions. Although many researchers believe that this interaction triggers transition to turbulence in flow systems, the role of the nonlinearity in this process has not been thoroughly investigated. This paper is the second of a two part work in which sensitivity analysis is used to study the effects of small disturbances on the transition process. In the first part, sensitivity analysis was used to predict the effects of a small disturbance on solutions of a motivating problem, a highly sensitive one dimensional Burgers' equation. In this paper, we extend the analysis to study the effects of small disturbances on transition to turbulence in the three dimensional Navier-Stokes equations. We show that the change in a laminar flow with respect to small variations in the initial flow or small forcing acting on the system is large when the linearized operator is stable yet non-normal. In this case, the solution of the disturbed problem can be very large (and potentially turbulent) even if the disturbances are extremely small. We also give bounds on the disturbed flow in terms of certain constants associated with the linearized operator.
Department(s)
Mathematics and Statistics
Sponsor(s)
United States. Air Force. Office of Scientific Research
United States. Defense Advanced Research Projects Agency
Keywords and Phrases
  • Frechet Differentiability,
  • Navier-Stokes Equations,
  • Non-Normality,
  • Semigroup Theory,
  • Sensitivity Analysis,
  • Sensitivity Equations,
  • Small Disturbances,
  • Transition to Turbulence
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2008 Elsevier, All rights reserved.
Publication Date
1-1-2008
Citation Information
John R. Singler. "Transition to Turbulence, Small Disturbances, and Sensitivity Analysis II: The Navier-Stokes Equations" Journal of Mathematical Analysis and Applications (2008)
Available at: http://works.bepress.com/john-singler/18/