Large and very large scale motions in roughbed open-channel flow
نویسندگان
چکیده
منابع مشابه
Very-large-scale motions in rough-bed open-channel flow
Long-duration particle image velocimetry measurements in rough-bed open-channel flows (OCFs) reveal that the pre-multiplied spectra of the streamwise velocity have a bimodal distribution due to the presence of largeand very-large-scale motions (LSMs and VLSMs, respectively). The existence of VLSMs in boundary layers, pipes and closed channels has been acknowledged for some time, but strong supp...
متن کاملLarge- and very-large-scale motions in channel and boundary-layer flows.
Large-scale motions (LSMs; having wavelengths up to 2-3 pipe radii) and very-LSMs (having wavelengths more than 3 pipe radii) have been shown to carry more than half of the kinetic energy and Reynolds shear stress in a fully developed pipe flow. Studies using essentially the same methods of measurement and analysis have been extended to channel and zero-pressure-gradient boundary-layer flows to...
متن کاملLarge-Eddy Simulation of Very-Large-Scale Motions
Large-eddy simulation is used to investigate very-large-scale mo7 tions (VLSMs) in the neutrally stratified atmospheric boundary layer at a 8 very high friction Reynolds number, Reτ ∼ O(10). The vertical height of the 9 computational domain is Lz = 1000 m, which corresponds to the thickness 10 of the boundary layer. In order to make sure that the largest flow structures 11 are properly resolved...
متن کاملeffect of sub-grid scales on large eddy simulation of particle deposition in a turbulent channel flow
چکیده ندارد.
15 صفحه اولThe evolution of large scale motions in turbulent pipe flow
A dual-plane snapshot POD analysis of turbulent pipe flow at a Reynolds number of 104,000 is presented. The high-speed PIV data were simultaneously acquired in two planes, a crossstream plane (2D-3C) and a streamwise plane (2D-2C) on the pipe centerline. The cross-stream plane analysis revealed large structures with a spatio-temporal extent of 1-2R, where R is the pipe radius. The temporal evol...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: E3S Web of Conferences
سال: 2018
ISSN: 2267-1242
DOI: 10.1051/e3sconf/20184005061