NDLI: Modelling the transitional boundary layer

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Modelling the transitional boundary layer

Content Provider	NASA Technical Reports Server (NTRS)
Author	Narasimha, R.
Copyright Year	1990
Description	Recent developments in the modelling of the transition zone in the boundary layer are reviewed (the zone being defined as extending from the station where intermittency begins to depart from zero to that where it is nearly unity). The value of using a new non-dimensional spot formation rate parameter, and the importance of allowing for so-called subtransitions within the transition zone, are both stressed. Models do reasonably well in constant pressure 2-dimensional flows, but in the presence of strong pressure gradients further improvements are needed. The linear combination approach works surprisingly well in most cases, but would not be so successful in situations where a purely laminar boundary layer would separate but a transitional one would not. Intermittency-weighted eddy viscosity methods do not predict peak surface parameters well without the introduction of an overshooting transition function whose connection with the spot theory of transition is obscure. Suggestions are made for further work that now appears necessary for developing improved models of the transition zone.
File Size	1191874
Page Count	30
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910006682
Archival Resource Key	ark:/13960/t7qp11p4t
Language	English
Publisher Date	1990-12-01
Access Restriction	Open
Subject Keyword	Aerodynamics Turbulent Flow Laminar Boundary Layer Computational Fluid Dynamics Laminar Flow Tollmien-schlichting Waves Boundary Layer Transition Mathematical Models Eddy Viscosity Intermittency Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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