In this work, the mechanism of reduction of wall shear stress caused by spanwise oscillation of a wall is discussed by means of a DNS of a channel flow. For the case of wall oscillation where about 35% reduction in shear stress is attained, the detailed attenuation process of turbulence is...
The present experiments, c... AV Johansson,PH Alfredsson,H Eckelmann - Springer Berlin Heidelberg 被引量: 202发表: 1987年 Coherent structure generation in near-wall turbulence We present a new mechanism for generation of near-wall streamwise vortices which dominate turbulence phenomena in boundary ...
Effect of Wall Temperature and Mach Number on the Turbulence Structure of Hypersonic Boundary Layers - 47th AIAA Aerospace Sciences Meeting including The New... AIAA 被引量: 0发表: 2009年 Direct numerical simulation of hypersonic turbulent boundary layers. Part 2. Effect of wall temperature In thi...
Particle image velocimetry (PIV) is a well-established tool to collect high-resolution velocity and turbulence data in the laboratory, in both air and water. Laboratory experiments are often performed under conditions of constant temperature or salinity or in flows with only small gradients of these...
On the large-eddy simulation of transitional wall-bounded flows The structure of the subgrid scale fields in plane channel flow has been studied at various stages of the transition process to turbulence. The residual st... U Piomelli,TA Zang,CG Speziale,... - 《Physics of Fluids A》 被...
Experimental Investigation on the Structure of Turbulence in Symmetrical Wall Subchannels and Comparison with the Results in an Asymmetrical ChannelExperimental Investigation on the Structure of Turbulence in Symmetrical Wall Subchannels and Comparison with the Results in an Asymmetrical ChannelFuel Element Cl...
Theory breakthrough calls for the API RP 19D revision for proppant conductivity. • New standard consideration required for testing coated proppant. • Further studies on diagenesis effect on proppant conductivity is required. • Further investigation on the mechanism of proppant erosion is required...
Effect of micro-blowing on flow characteristics in a turbulent flat plate boundary layer and its mechanism of drag reduction Micro-blowing technology can change the turbulent structure in a flat plate flow and reduce the wall fric-tion drag. In this paper, two cases of the inflow... Y Fan,...
As a result of the Coanda effect, a symmetrical free jet will flow as an asymmetrical wall jet. At the same time, at the obstacle along which the flow is observed, the wall jet generates pressure distribution. In this study, the obstacle located at the d
This paper presents measurements of the impervious-wall effectiveness of a two-dimensional wall jet obtained using a constant value of lip thickness, 0.032 in. and four slot heights, viz., 0.5, 0.25, 0.132, and 0.074 in. The measurements are in the range of slot-to-free-stream velocity rat...