Accession Number : ADA261845


Title :   Simulation of Boundary-Layer Transition: Receptivity to Spike Stage


Descriptive Note : Contractor rept.


Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA


Personal Author(s) : Bertolotti, Fabio P ; Crouch, Jeffrey D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261845.pdf


Report Date : Dec 1992


Pagination or Media Count : 21


Abstract : The transition to turbulence in a boundary layer over a flat plate with mild surface undulations is simulated using the parabolized stability equations (PSE). The simulations incorporate the receptivity; the linear growth, and the nonlinear interactions leading to breakdown. The nonlocalized receptivity couples acoustic perturbations in the free stream with disturbances generated by the surface undulations to activate a resonance with the natural eigenmodes of the boundary layer. The nonlinear simulations display the influence of the receptivity inputs on transition. Results show the transition location to be highly sensitive to the amplitudes of both the acoustic disturbance and the surface waviness.... Receptivity, Laminar to turbulence transition, Boundary layer.


Descriptors :   *TURBULENT BOUNDARY LAYER , *ACOUSTIC FIELDS , *FLAT PLATE MODELS , MATHEMATICAL MODELS , INPUT , SIMULATION , STABILITY , BOUNDARIES , RESONANCE , ACOUSTICS , AMPLITUDE , SPIKES , STREAMS , FREE STREAM , TRANSITIONS , PERTURBATIONS , PLATES , SURFACES , INTERACTIONS , LAYERS , TURBULENCE


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE