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Large-eddy simulation of atmospheric boundary layer flow and passive scalar dispersion over idealized urban surfaces

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Adjustment of Turbulent Boundary-Layer Flow to Idealized Urban Surfaces: A Large-Eddy Simulation Study

Fernando Porté Agel, Wai Chi Cheng

Large-eddy simulations (LES) are performed to simulate the atmospheric boundary-layer (ABL) flow through idealized urban canopies represented by uniform arrays of cubes in order to better understand atmospheric flow over rural-to-urban surface transitions. ...

Springer2015

Large-eddy simulation is used to investigate very-large-scale motions (VLSMs) in the neutrally stratified atmospheric boundary layer at a very high friction Reynolds number, . The vertical height of the computational domain is m, which corresponds to the t ...

Springer Verlag2015

Complex turbulent flow in the atmospheric boundary layer: Lab and field measurements of embedded canopy wakes

Fernando Porté Agel, Corey Dean Markfort, Fernando Carbajo Fuertes

Natural and anthropogenic fragmented landscapes are pervasive and this complexity significantly affects the structure of the atmospheric boundary layer, causing classic similarity theories to break down. This is especially true in areas affected by wake tu ...

2015

An indirect criterion for the laminar to turbulent flow transition in shear-driven annular liquid films

John Richard Thome, Andrea Cioncolini

An indirect method to identify the laminar to turbulent flow transition in shear-driven annular liquid films has been developed and used, together with literature measurements of the velocity profile, to approximately resolve the near wall structure in she ...

Pergamon-Elsevier Science Ltd2015

, ,

Use of the GBS code to successfully identify the turbulent regimes of ISTTOK's Scrape-off Layer. This was done through linear calculations and two and three dimensional nonlinear simulations. The numerical and experimental results were compared showing goo ...

2015

Turbulence in Rivers

Mário Jorge Rodrigues Pereira Da Franca

The study of turbulence has always been a challenge for scientists working on geophysical flows. Turbulent flows are common in nature and have an important role in geophysical disciplines such as river morphology, landscape modeling, atmospheric dynamics a ...

Springer2015

Comparison of 3D flux-driven scrape-off layer turbulence simulations with gas-puff imaging of Alcator C-Mod inner-wall limited discharges

Paolo Ricci, Mario Ludovico Podesta, Federico David Halpern

We carry out a quantitative comparison between gas-puff imaging (GPI) turbulence measurements in Alcator C-Mod inner-wall limited discharges (Zweben et al 2009 Phys. Plasmas 18 082505) and 3D flux-driven drift-reduced Braginskii turbulence simulations of s ...

Iop Publishing Ltd2015

, ,

Turbulent boundary-layer flows over complex topography have been extensively studied in the atmospheric sciences and wind engineering communities. The upwind turbulence level, the atmospheric thermal stability and the shape of the topography as well as sur ...

2014

The vertical structure of eddy diffusivity in pure slope flows over smooth surfaces

Jiannong Fang, Marc Parlange, Marco Giovanni Giometto

Thermally driven slope flows are ubiquitous in nature and play a major role in regulating local microclimates in valleys, glaciers and ice-sheets. They control in large part surface momentum, heat and moisture fluxes, and their effects must therefore be ac ...

2014

Turbulent flow in and over an urban canopy in Vancouver, Canada

In this Master’s thesis, turbulent flow of the atmosphere over the urban canopy of the ‘Sunset’ neighbourhood in Vancouver was studied using a Large Eddy Simulation (LES) model. A high precision Light Detection and Ranging (LiDAR) dataset was employed to r ...

2014