Cover: e-9: Stability Theory and Boundary-Layer Transition

e-9: Stability Theory and Boundary-Layer Transition

Published 1977

by Stanley A. Berger, Jerry Aroesty

Purchase Print Copy

 Format Price
Add to Cart Paperback33 pages $20.00

Successful low-drag design employs methods of boundary-layer control to delay the transition of unstable laminar boundary layers, but a suitable comprehensive theory is needed to guide prediction and control of boundary-layer transition for low-drag hydrodynamics. This report suggests that such a theory must be substantially different from the current nonlinear stability theories. New and less formal nonlinear theories, which combine the growth rates and frequency dependence of the two-dimensional Tollmien-Schlichting waves (which are the basis of the "e-9" method) and the three-dimensional nonlinear processes of modern stability theory, could ultimately lead to improvements in the understanding and manipulation of the transition process in low-drag hydrodynamics, and to the inclusion of disturbance effects. Until such methods are developed, the "e-9" or similar empirically based methods must be relied on for design and analysis.

This report is part of the RAND report series. The report was a product of RAND from 1948 to 1993 that represented the principal publication documenting and transmitting RAND's major research findings and final research.

This document and trademark(s) contained herein are protected by law. This representation of RAND intellectual property is provided for noncommercial use only. Unauthorized posting of this publication online is prohibited; linking directly to this product page is encouraged. Permission is required from RAND to reproduce, or reuse in another form, any of its research documents for commercial purposes. For information on reprint and reuse permissions, please visit www.rand.org/pubs/permissions.

RAND is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.