We compare measured profiles of upper layer shear and rates of kinetic energy dissipation with the predictions of a one-dimensional turbulence model proposed by Craig and Banner (1994). Their formulation contains an unknown parameter, the "roughness length" z0, which we determine by fitting computed and observed dissipation rates. The resulting model, without further adjustment, is then used to...

This paper outlines the authors’ experimental research in rough-wall-bounded turbulent flows that has spanned the past 15 years. The results show that, in general, roughness effects are confined to the inner layer. In accordance with Townsend’s Reynolds number similarity hypothesis, the outer layer is insensitive to surface condition except in the role it plays in setting the length and velocit...

BACKGROUND During the aging process, skin shows visible changes, characterized by a loss of elasticity and the appearance of wrinkles due to reduced collagen production and decreased elasticity of elastin fibers. Panax ginseng Meyer has been used as a traditional medicine for various diseases due to its wide range of biological activities including skin protective effects. Ginsenosides are the ...

In this work, the dry turning of Inconel 601 alloy in a environment with PVD-coated cutting inserts was studied. Turning performed at various speeds, feeds, insert shapes, corner radii, rake angles, and approach angles. After machining, arithmetic mean surface roughness (Ra) flank wear (VB) were measured, material removal rate also calculated (MRR). An analysis variance (ANOVA) to determine eff...

AbdvactThe effects of quantization in an LMS-Newton adaptive filtering algorithm are investigated. The algorithm considered uses an optimum convergence factor, that forces the output ayoclteriori error to become zero in each iteration. The prOpagation of errors due to quantization in the internal variables of the algorithm is investigated and a closed-form formula for the excess mean square err...

[1] A new generation large-eddy simulation (LES), based on a Lagrangian scaledependent dynamic subgrid model, is applied to neutral atmospheric flow over heterogeneous land surfaces. This LES is faithful to the physics of the interaction of the lower atmosphere and the land surface based on classical validation tests of the simulated mean wind profile and the atmospheric turbulence. Simulations...