Although several velocity transformations for compressible zero-pressure-gradient boundary layers have been proposed in the past decades, their performance noncanonical wall-bounded turbulent flows has not systematically investigated. This work assesses popular profile through application to types of flows. Specifically, this explores direct numerical simulation databases high-enthalpy with dis...

Among the fundamental problems in canopy turbulence, particularly near the forest floor, remain the local diabatic effects and linkages between turbulent length scales and the canopy morphology. To progress on these problems, mean and higher order turbulence statistics are collected in a uniform pine forest across a wide range of atmospheric stability conditions using five 3-D anemometers in th...

1. The rapid decay of luminescence in extracts of the ostracod crustacean Cypridina hilgendorfii, has been studied by means of a photoelectric-amplifier-string galvanometer recording system. 2. For rapid flashes of luminescence, the decay is logarithmic if ratio of luciferin to luciferase is small; logarithmic plus an initial flash, if ratio of luciferin to luciferase is greater than five. The ...

In this paper we report on (two-component) LDV experiments in a fully developed turbulent pipe flow with a drag-reducing polymer (partially hydrolyzed polyacrylamide) dissolved in water. The Reynolds number based on the mean velocity, the pipe diameter and the local viscosity at the wall is approximately 10000. We have used polymer solutions with three different concentrations which have been c...

A direct numerical simulation of incompressible channel flow at Reτ = 5186 has been performed, and the flow exhibits a number of the characteristics of high Reynolds number wall-bounded turbulent flows. For example, a region where the mean velocity has a logarithmic variation is observed, with von Kármán constant κ = 0.384 ± 0.004. There is also a logarithmic dependence of the variance of the s...

A theory-based prediction method was used to estimate the friction factor and heat transfer rate in turbulent flow of a helically coiled tube. The secondary produced by centrifugal force improves mass transfer; therefore, spiral coil pipes are widely variety industrial applications. law wall Reynolds analogy, which states that momentum is equivalent transfer, were this theoretical method. logar...

It is shown that, if the tracer population is supported by a spherical dark halo with a core or a cusp diverging more slowly than that of a singular isothermal sphere, the logarithmic cusp slope γ of the tracers must be given exactly by γ = 2β where β is their velocity anisotropy parameter at the center unless the same tracers are dynamically cold at the center. If the halo cusp diverges faster...

The logarithmic dependence of streamwise turbulence intensity has been observed repeatedly in recent experimental and direct numerical simulation data. However, its spectral counterpart, a well-developed $k^{-1}$ spectrum ( $k$ is the spatial wavenumber wall-parallel direction), not convincingly from same In present study, we revisit spectrum-based attached eddy model Perry co-workers, who prop...

This work aims to study the vertical velocity distribution in near-wall layer of a pipe, channel, and boundary flat plate because these issues are great practical theoretical importance. Until now, engineering calculations turbulent flows have been based on empirical formulas derived last century. The theory fluid motion has not completed, hydraulic resistance remain open for further study. It ...