On the mechanism of wall turbulence
Web15 de fev. de 2001 · ABSTRACT. Recent experimental and computational studies by Adrian and co-workers, such as Adrian et al. [J. Fluid Mech. 422, 1 (2000)] and Zhou et al. [J. … Web13 de out. de 2000 · The production of turbulence and Reynolds stress centers around vortices and "streaks of low speed fluid near the wall. There are two main categories of self-sustaining mechanisms. In one...
On the mechanism of wall turbulence
Did you know?
WebSummary. Turbulence is directly related to the existence of a shear or boundary layer. In such a layer there exists under equilibrium conditions a balance between the creative and destructive processes. The author has shown that to account for the creative process there existes a definite structure, characterized as a universal element of ... WebThe physical mechanisms that cause laminar flow to lose its stability and to transit to turbulence are still poorly understood (Trefethen et al, 1993; Grossmann, 2000; Drazin and Reid, 2004). From mathematical analysis, Lin (1955) demostrated that transition from laminar to turbulent flows may be due to the occurrence of instability.
WebIn this paper an attempt is made to formulate a model for the mechanism of wall turbulence that links recent flow-visualization observations with the various quantitative measurements and scaling laws established from anemometry studies. Various mechanisms are proposed, all of which use the concept of the horse-shoe, hairpin or ‘A’ … WebIn this paper an attempt is made to formulate a model for the mechanism of wall turbulence that links recent flow-visualization observations with the various quantitative measurements and scaling laws established from anemometry studies. Various mechanisms are proposed, all of which use the concept of the horse-shoe, hairpin or ‘A’ …
Web10 de nov. de 2008 · Mechanism of Wall Turbulence in Boundary Layer Flow Authors: Hua-Shu Dou Zhejiang Sci-Tech University Boo Cheong Khoo National University of … Web21 de abr. de 2006 · In this paper the dimensional-analysis approach to wall turbulence of Perry & Abell (1977) has been extended in a number of directions. Further recent …
Web8 de nov. de 2024 · Furthermore, it is found that it requires both large enough thickness of the SSL and velocity amplitude to relaminarize the turbulence. The relaminarization …
WebModeling wall turbulence remains a major challenge, as a sufficient physical understanding of these flows is still lacking. In an effort to move toward a physics-based model, A.A. Townsend introduced the hypothesis that the dominant energy-containing motions in wall turbulence are due to large eddies attached to the wall. From this simple hypothesis, … simply asset finance belfastWeb1 de abr. de 2024 · Download Citation On Apr 1, 2024, Michael D. Graham published Structure and dynamics of turbulence in viscoelastic channel flow Find, read and cite all the research you need on ResearchGate simply assembledWebMoreover, the refined attached-eddy hypothesis continues to provide an important theoretical framework for the structure of wall-bounded turbulent flows. Keywords boundary layers, channel flow, pipe flow, coherent motions, turbulence structure Figures rayon weightWeb10 de jul. de 2009 · Turbulent flows near walls have been the focus of intense study since their first description by Ludwig Prandtl over 100 years ago. They are critical in … simply asset finance ltdWebOn the mechanism of wall turbulence Perry, A. E. ; Chong, M. S. An attempt is made to formulate a model for the mechanism of wall turbulence that links recent flow … rayon waltersWeb18 de abr. de 2007 · This paper is concerned with the structure of organized motion in the canonical forms of wall turbulence: steady, fully developed, incompressible, smooth-walled pipe and channel flow and the zero … ray on wentworthWeb10 de abr. de 2024 · The experiment was performed in a flow loop, specially designed for the research on wall turbulence and coherent structures in the facilities of the interdisciplinary center of fluid dynamics (NIDF). ... U. Chunxiao, “ Coherent structures and drag-reduction mechanism in wall turbulence,” Adv. Mech. 45(1), 201504 (2015). rayon vs polyester clothing