The free-stream Mach numbers are equal to and 8 in the cases of adiabatic flat plate and sharp wedge, respectively. Numerical simulation and theoretical analysis on hypersonic boundary-layer receptivity to wall by: 3. The topics of Novosibirsk shifted to resonant wave interactions and secondary instabilities in boundary layers. Pipe- and channel-flow transition were discussed as model problems for the boundary layer. Investigations of free shear layers were presented and a heavy dose of supersonic papers appeared for the first time. On the Receptivity of a Flat Plate Boundary Layer to Localized Free Stream Disturbances. Pages The Receptivity of Flat-Plate Boundary-Layers with Two-Dimensional Roughness Elements to Freestream Sound and Its Control. Book Title Laminar-Turbulent Transition Book Subtitle IUTAM Symposium, Sendai/Japan, September 5 – 9, This paper presents our recent work on investigating velocity slip boundary conditions’ effects on supersonic flat plate boundary layer flow stability. The velocity-slip boundary conditions are adopted and the flow properties are obtained by solving boundary layer equations. Stability analysis of two such boundary layer flows is performed by using the Linear stability : Xin He, Kai Zhang, Chunpei Cai.

Open Library is an initiative of the Internet Archive, a (c)(3) non-profit, building a digital library of Internet sites and other cultural artifacts in digital projects include the Wayback Machine, and A finite difference method is used to do direct numerical simulation (DNS) of hypersonic unsteady flowfield under the action of freestream pulse wave. The response of the hypersonic flowfield to freestream pulse wave is studied, and the generation and evolution characteristics of the boundary layer disturbance waves are discussed. The effects of the pulse wave types on the Author: Xiaojun Tang, Juan Yu, Tianli Hui, Fenglong Yang, Wentao Yu. An experimental study has been conducted to investigate the effects of transitionally rough surface on the flat-plate boundary layer transition. Transitional boundary layers with three different flat plates (k s + = ∼ , ∼ , and ∼ ) have been measured with a single-sensor hot-wire by: 1. Wake Downstream of a Up: Incompressible Boundary Layers Previous: Self-Similar Boundary Layers Boundary Layer on a Flat Plate Consider a flat plate of length, infinite width, and negligible thickness, that lies in the -plane, and whose two edges correspond to e that the plate is immersed in a low viscosity fluid whose unperturbed velocity field is.

Receptivity. The initial stage of the natural transition process is known as the Receptivity phase and consists of the transformation of environmental disturbances – both acoustic (sound) and vortical (turbulence) – into small perturbations within the boundary layer. The mechanisms by which these disturbances arise are varied and include. A bypass transition is a laminar–turbulent transition in a fluid flow over a surface. It occurs when a laminar boundary layer transitions to a turbulent one through some secondary instability mode, bypassing some of the pre-transitional events that typically occur in a . Abstract Issues related to prediction of laminar-turbulent transition on hypersonic configurations in high-altitude flight are discussed. The laminar flow control strategy and appropriate laminarization methods for high-speed vehicles are reviewed. The paper is aimed to motivate the transition study groups to integrate their knowledge and tools in the rational framework of the amplitude by: In meteorology, the planetary boundary layer (PBL), also known as the atmospheric boundary layer (ABL) or peplosphere, is the lowest part of the atmosphere and its behaviour is directly influenced by its contact with a planetary surface. On Earth it usually responds to changes in surface radiative forcing in an hour or less. In this layer physical quantities such as flow .