Reliable prediction of the erosion rate sediment beds is important for many applications in coastal and river engineering. Theoretical understanding empirically derived scaling relations still lacking. This applies particular anomaly between low high Shields number conditions. In this work, process studied from perspective phase-averaged turbulent kinetic energy (TKE) equations. The multi-phase...

Abstract In this study, the effects of roadside building roof shapes and tree plantings on dispersion vehicle exhaust gas pollution in urban street have been carefully explored. Three typical shapes, i.e., flat, triangle round are considered present work. Firstly, numerical simulations air transport atmospheric turbulent boundary layer with/without vegetation canopy performed using Computationa...

We develop individual-based movement ecology models (MEM) to explore turkey vulture (Cathartes aura) migration decisions at both hourly and daily scales. Vulture movements in 10 migration events were recorded with satellite-reporting GPS sensors, and flight behavior was observed visually, aided by on-the-ground VHF radio-tracking. We used the North American Regional Reanalysis dataset to obtain...

This paper proposes two DES (Detached Eddy Simulation) model and one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) model for the simulations of unsteady separated turbulent flows. The two-equation k-ε based models are implemented in a full 3-D Navier Stokes solver and simulations are carried out using a 3 order Roe scheme. The predictions of the models are compared ...

PURPOSE Evaluate spiral three-dimensional (3D) phase contrast MRI for the assessment of turbulence and velocity in stenotic flow. METHODS A-stack-of-spirals 3D phase contrast MRI sequence was evaluated in vitro against a conventional Cartesian sequence. Measurements were made in a flow phantom with a 75% stenosis. Both spiral and Cartesian imaging were performed using different scan orientati...

[1] Data collected from the near-field region (first several kilometers) of the Merrimack River plume are analyzed to provide estimates of turbulent kinetic energy (TKE) dissipation rates. Measurement techniques included a control volume method incorporating density and velocity survey data, and direct dissipation rate measurements by turbulence sensors mounted on an autonomous underwater vehic...

Wall jets appear in many situations of technological and scientific interest. In gas turbines, flows produced by the film as well impingement cooling devices are three-dimensional wall jets. High-lift produce that can easily be represented two-dimensional It has been known for a long time both stagnant moving environments display layered structure only partially obey similarity laws. this paper...

This study describes a new convenient and robust system developed to measure benthic boundary layer properties, with emphasis placed on the determination of bed shear stress and roughness height distribution within estuarine systems by using velocity measurements. This system consisted of a remotely operated motorised traverser that allowed a single ADV to collect data between 0 and 1 m above t...