Finite-Amplitude Waves in Inviscid Shear Flows
- Creators
- Moore, D. W.
- Saffman, P. G.
Abstract
This paper examines the existence and properties of steady finite-amplitude waves of cats-eye form superposed on a unidirectional inviscid, incompressible shear flow. The problem is formulated as the solution of nonlinear Poisson equations for the stream function with boundary conditions on the unknown edges of the cats-eyes. The dependence of vorticity on stream function is assumed outside the cats-eyes to be as in the undisturbed flow, and uniform unknown vorticity is assumed inside. It is argued on the basis of a finite difference discretization that the problem is determinate, and numerical solutions are obtained for Couette-Poiseuille channel flow. These are compared with the predictions of a weakly nonlinear theory based on the approach of Benney & Bergeron (1969) and Davis (1969). The phase speed of the waves is found to be linear in the wave amplitude.
Additional Information
© 1982 The Royal Society. This work was supported by the Office of Naval Research and the Department of Energy (Office of Basic Energy Sciences). We wish to thank Control Data Corporation for the grant of time on the Cyber 203 at the C.D.C. Service Center, Arden Hills, Minnesota. We also wish to thank Dr J. C. Schatzman for a great deal of help and for preparing the graphic output of figure 6. The authors are grateful to Professor J. T. Stuart, F.R.S., for some valuable comments.Additional details
- Eprint ID
- 54188
- Resolver ID
- CaltechAUTHORS:20150128-125338803
- Office of Naval Research (ONR)
- Department of Energy (DOE)
- Created
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2015-01-28Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field