On the mechanism of wall turbulence
Web13 de abr. de 2024 · Request PDF Exact relations between Laplacian of near-wall scalar fields and surface quantities in incompressible viscous flow In this short paper, we derive the on-wall values and the wall ... Web23 de out. de 2013 · Using a variety of techniques, including direct tracking of the structures, it is shown that an important characteristic of wall-bounded turbulence is temporally …
On the mechanism of wall turbulence
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WebThe kinematics and dynamics of wall-bounded turbulence are surveyed, with emphasis on the multiscale processes associated with the logarithmic layer and with its interactions with the wall. Web2 de out. de 2024 · Turbulence intensity also has a significant impact on the physical mechanism of the cooling of gas turbine blades [16 ... Rivir, R. Free-stream turbulence from a circular wall jet on a flat plate heat transfer and boundary layer flow. J. Turbomach. 1989, 111, 78–86. [Google Scholar] Moffat, R.J.; Maciejewski, P.K. Effects of ...
WebThe discovery of coherent structures in turbulent shear flows is one of the most important advances in turbulence research of the last century. These large-scale structures play important role in the physics of wall turbulence, and suggest a new direction for turbulence control. Web1 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
Web20 de jun. de 2024 · Wall turbulence is a ubiquitous phenomenon in nature and engineering applications, yet predicting such turbulence is difficult due to its complexity. Web19 de mai. de 2000 · Direct numerical simulations of wall-bounded flow reveal that turbulence production can be suppressed by a transverse traveling wave, and arrays of electromagnetic tiles that produce the required traveling wave excitation at a high efficiency are demonstrated. Direct numerical simulations of wall-bounded flow reveal that …
WebUsing direct numerical simulations of turbulent channel flow, we present new insight into the formation mechanism of near-wall longitudinal vortices. Instability of lifted, vortex-free low-speed streaks is shown to generate, upon nonlinear saturation, new streamwise vortices, which dominate near-wall turbulence production, drag, and heat transfer.
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’ … ontario assessment officeWebOn 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 … ontario assessment propertyWebIn 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’ … ontario association of archersWeb14 de abr. de 2024 · where S is the modulus of the mean rate-of-strain tensor, G k is the generation of turbulence kinetic energy due to the mean velocity gradients, C 2 is an empirical constant with a value of 1.9, and σ k and σ ε are the turbulent Prandtl numbers for k and ε, respectively, with the values of 1.0 and 1.2, respectively.. 2.3 Physical … ontario association for behavior analysisWeb8 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 … ontario assessment review boardWebOn the mechanism of elasto-inertial turbulence Phys Fluids (1994). 2013 Nov;25(11):110817. doi: 10.1063/1.4820142. Epub 2013 Sep 17. Authors ... The flow … iom fsa licencing policyWebHá 1 dia · Although turbulence is inherently unpredictable and chaotic, characterizing fluid flow behavior at very high flow speeds, some aspects of it can be modeled and … ontario asset management legislation