3D Numerical Simulation of Turbulent Open-channel Flow Through Vegetation
Title | 3D Numerical Simulation of Turbulent Open-channel Flow Through Vegetation PDF eBook |
Author | Su Jin Kim |
Publisher | |
Pages | |
Release | 2011 |
Genre | Computational fluid dynamics |
ISBN |
A comprehensive understanding of the hydrodynamics in vegetated open-channels and flow-vegetation interaction is of high interest to researchers and practitioners alike for instance in the content of river and coastal restoration schemes. The focus of this study was to investigate the effect of the presence of vegetation on flow resistance, turbulence statistics, and the instantaneous flow in open channels by performing three-dimensional computational-fluid-dynamics (CFD) simulations.
Direct Numerical Simulation of Turbulent Open Channel Flow Over a Poly Disperse Particle Bed
Title | Direct Numerical Simulation of Turbulent Open Channel Flow Over a Poly Disperse Particle Bed PDF eBook |
Author | Shahzad Muhammed Sarwar |
Publisher | |
Pages | |
Release | 2021 |
Genre | |
ISBN |
Open-channel Flow Through Simulated Vegetation
Title | Open-channel Flow Through Simulated Vegetation PDF eBook |
Author | Fabian Lopez |
Publisher | |
Pages | 128 |
Release | 1997 |
Genre | Channels (Hydraulic engineering) |
ISBN |
Numerical Simulation of Turbulent Flow and Microclimate Within and Above Vegetation Canopy
Title | Numerical Simulation of Turbulent Flow and Microclimate Within and Above Vegetation Canopy PDF eBook |
Author | Hao-Chi Cynthia Poon |
Publisher | |
Pages | |
Release | 2017-01-26 |
Genre | |
ISBN | 9781361240236 |
Numerical Simulation of Turbulent Flow and Microclimate Within and Above Vegetation Canopy
Title | Numerical Simulation of Turbulent Flow and Microclimate Within and Above Vegetation Canopy PDF eBook |
Author | Hao-chi Poon (Cynthia) |
Publisher | |
Pages | 179 |
Release | 2010 |
Genre | Turbulence |
ISBN |
Direct Numerical Simulation of Turbulent Flow Over a Backward-facing Step
Title | Direct Numerical Simulation of Turbulent Flow Over a Backward-facing Step PDF eBook |
Author | Michal Andrzej Kopera |
Publisher | |
Pages | |
Release | 2011 |
Genre | |
ISBN |
A three-dimensional, turbulent flow in a channel with a sudden expansion was studied by direct numerical simulation of the incompressible Navier-Stokes equations. The objective of this study was to provide statistical data of backwardfacing step flow for turbulence modelling. Additionally, analysis of the statistical and dynamical properties of the flow is performed. The Reynolds number of the main simulation was Reh = 9000, based on the step height and mean inlet velocity, with the expansion ratio ER = 2:0. The discretisation is performed using the spectral/hp element method with stiffly-stable velocity correction scheme for time integration. The inlet boundary condition is a fully turbulent velocity and pressure field regenerated from a plane downstream of the inlet. A constant flowrate was ensured by applying Stokes flow correction in the inlet regeneration area. Time and spanwise averaged results revealed, apart from the primary recirculation bubble, secondary and tertiary corner eddies. Streamlines show an additional small eddy at the downstream tip of the secondary corner eddy, with the same circulation direction as the secondary vortex. The analysis of the 3D, timeonly average shows the wavy spanwise structure of both primary and secondary recirculation bubble, that results in spanwise variations of the mean reattachment location. The visualisation of spanwise averaged pressure uctuations and streamwise velocity showed that the interaction of vortices with the recirculation bubble is responsible for the apping of the reattachment position. The characteristic frequency St = 0:078 was found. The analysis of small-scale energy transfer was performed to reveal large backscatter regions in strong Reynolds stress areas in the mixing layer. High correlation of small-scale transfer with non-linear interaction of large-scale velocity and small-scale vorticity was found. The data of the flow fields was archived. It contains the averages for velocities, pressure and Reynolds stress tensor, as well as 3D instantaneous pressure and velocity history.
Aquananotechnology
Title | Aquananotechnology PDF eBook |
Author | David E. Reisner |
Publisher | CRC Press |
Pages | 1370 |
Release | 2014-09-24 |
Genre | Science |
ISBN | 0415621291 |
The world’s fresh water supplies are dwindling rapidly—even wastewater is now considered an asset. By 2025, most of the world's population will be facing serious water stresses and shortages. Aquananotechnology: Global Prospects breaks new ground with its informative and innovative introduction of the application of nanotechnology to the remediation of contaminated water for drinking and industrial use. It provides a comprehensive overview, from a global perspective, of the latest research and developments in the use of nanotechnology for water purification and desalination methods. The book also covers approaches to remediation such as high surface area nanoscale media for adsorption of toxic species, UV treatment of pathogens, and regeneration of saturated media with applications in municipal water supplies, produced water from fracking, ballast water, and more. It also discusses membranes, desalination, sensing, engineered polymers, magnetic nanomaterials, electrospun nanofibers, photocatalysis, endocrine disruptors, and Al13 clusters. It explores physics-based phenomena such as subcritical water and cavitation-induced sonoluminescence, and fog harvesting. With contributions from experts in developed and developing countries, including those with severe contamination, such as China, India, and Pakistan, the book’s content spans a wide range of the subject areas that fall under the aquananotechnology banner, either squarely or tangentially. The book strongly emphasizes sorption media, with broad application to a myriad of contaminants—both geogenic and anthropogenic—keeping in mind that it is not enough for water to be potable, it must also be palatable.