Web1 de fev. de 2013 · XI (1976; Zbl 0325.76063)], where, in the interior part of the inertial region, both the mean velocities and streamwise turbulence intensities follow logarithmic functions of distance from... WebConsidering first the near-wall region, figure 1a shows the spectrum at zCZ15, a height that corresponds to the near-wall peak in turbulence production and also the peak in the broadband streamwise intensity (see closed symbols in figure 1d). At this wall-normal position, a clear peak in the pre-multiplied spectra occurs at

Coherent organizational states in turbulent pipe flow at moderate ...

WebUtilizing a turbulent channel ow facility, experiments were performed to determine the modications made to the temporal and spatial structure of turbulence over a sinusoidally rough surface due to momentum injection through the surface. As expected, when compared to the smooth-walled conditions, it was found that the surface roughness … Web16 de jan. de 2007 · The study of turbulence near walls has experienced a renaissance in the last decade, largely owing to the availability of high-quality numerical simulations. The viscous and buffer layers over smooth walls are essentially independent of the outer flow, and there is a family of numerically exact nonlinear structures that account for about half … thyssen fahrrad

On the logarithmic region in wall turbulence - ResearchGate

Web27 de mai. de 2012 · Tomographic particle image velocimetry was used to quantitatively visualize the three-dimensional coherent structures in the logarithmic region of the turbulent boundary layer in a water tunnel. The Reynolds number based on momentum thickness is Re θ = 2 460. The instantaneous velocity fields give evidence of hairpin … Web7 de out. de 1999 · ABSTRACT. The objective of this investigation is to study the velocity-field sources for the fluctuating wall pressure, determine their locations in the boundary layer, and investigate their physics. The velocity-field sources and partial wall pressures were computed from a database generated by a direct numerical simulation of a low … Web16 de jan. de 2007 · The history and theory supporting the idea of a universal log law for turbulent wall-bounded flows are briefly reviewed. The original idea of justifying a log … thelawncompany.com