Environmental Fluid Mechanics

article

Simulation-based optimization of in-stream structures design: rock vanes

A. Khosronejad, J. L. Kozarek, P. Diplas, C. Hill, more

Environmental Fluid Mechanics > 2018 > 18 > 3 > 695-738

We employ a three-dimensional coupled hydro-morphodynamic model, the Virtual Flow Simulator (VFS-Geophysics) in its Unsteady Reynolds Averaged Navier–Stokes mode closed with $$k-\omega$$ k-ω model, to simulate the turbulent flow and sediment transport in large-scale sand and gravel bed waterways under prototype and live-bed conditions. The simulation results are used to carry out systematic numerical...

article

Wind-induced pressure at a tunnel portal

T. Kubwimana, P. Salizzoni, E. Bergamini, A. Mos, more

Environmental Fluid Mechanics > 2018 > 18 > 3 > 769-786

In order to properly size the mechanical ventilation system of a tunnel, it is essential to estimate the wind-driven pressure difference that might rise between its two portals. In this respect, we explore here the pressure distribution over a tunnel portal under the influence of an incident atmospheric boundary layer and, in particular, its dependency on wind direction and on tunnel geometry. Reduced...

article

Analytical solution of two-dimensional advection–dispersion equation with spatio-temporal coefficients for point sources in an infinite medium using Green’s function method

Abhishek Sanskrityayn, Vijay P. Singh, Vinod Kumar Bharati, Naveen Kumar

Environmental Fluid Mechanics > 2018 > 18 > 3 > 739-757

In the present study analytical solutions of a two-dimensional advection–dispersion equation (ADE) with spatially and temporally dependent longitudinal and lateral components of the dispersion coefficient and velocity are obtained using Green’s Function Method (GFM). These solutions describe solute transport in infinite horizontal groundwater flow, assimilating the spatio-temporal dependence of transport...

article

A high resolution measurement of the morning ABL transition using distributed temperature sensing and an unmanned aircraft system

C. W. Higgins, M. G. Wing, J. Kelley, C. Sayde, more

Environmental Fluid Mechanics > 2018 > 18 > 3 > 683-693

We used an unmanned aircraft system (UAS) to lift and suspend distributed temperature sensing (DTS) technologies to observe the onset of an early morning transition from stable to unstably stratified atmospheric conditions. DTS employs a fiber optic cable interrogated by laser light, and uses the temperature dependent Raman scattering phenomenon and the speed of light to obtain a discrete spatial...

article

Effect of atmospheric boundary layer stability on the inclination angle of turbulence coherent structures

Eslam Reda Lotfy, Zambri Harun

Environmental Fluid Mechanics > 2018 > 18 > 3 > 637-659

Coherent structures in the atmospheric boundary layer are fundamental to the transport of momentum and heat as well as to the production of turbulence. The present work attempts to investigate the behavior of the inclination angle of the vortex packet structures ($$\gamma$$ γ ) under different stability conditions. The data were collected from the Marine Ecosystem Research Centre (EKOMAR) site at...

article

On force consideration in coupled ISPH framework for sediment transport in presence of free-surface flow

Gourabananda Pahar, Anirban Dhar

Environmental Fluid Mechanics > 2018 > 18 > 3 > 555-579

A coupled divergence-free Incompressible Smoothed Particle Hydrodynamics (ISPH) framework for sediment transport is extended for application in generalized free-surface flow situations. The computation of interaction force pair between pure fluid and sediment modules makes the model flexible enough to be applicable for diverse scenarios with variable resolutions. Three scenarios are included to quantify...

article

Part I : a priori study of erosion and deposition with large eddy simulation of turbulent flow over multiple 2D sandy Gaussian hills

G. Huang, C. Le Ribault, I. Vinkovic, S. Simoëns

Environmental Fluid Mechanics > 2018 > 18 > 3 > 581-609

The micro-scale prediction of sand trapping or take-off over hilly terrains is a crucial issue in semi-arid regions for soil depletion. In this context, large eddy simulations around one or several hills are performed in order to provide statistical parameters to characterize the flow at micro-scales and provide data for mesoscale modelling. We focus on the determination of recirculation zones since...

article

Numerical study of aerosols motion and deposition outside and inside buildings with different geometries

Mahbobeh Momeni, Ataollah Soltani Goharrizi, Bahador Abolpour

Environmental Fluid Mechanics > 2018 > 18 > 3 > 759-767

In this study, motion and deposition of various sizes of aerosols in turbulent flow of air inside and outside of two-dimensional buildings with closed and open windows have been investigated, numerically. This simulation was based on FVM solving of RANS equations with k–ε model. Eulerian–Lagrangian method was used to simulate fluid and particles motions, respectively, and one-way coupling between...

article

Enhancing transverse mixing in streams with submerged vanes

H. Sharma, Z. Ahmad

Environmental Fluid Mechanics > 2018 > 18 > 3 > 661-681

In order to maintain the water quality of moving streams, it is essential to know the process of pollutant mixing. The transverse mixing is very important which is needed to be modeled to understand mixing phenomenon. It was observed that transverse mixing is a strong function of secondary currents, thus, submerged vanes, which are aerofoil skewed at angle of 10°–40° with respect to flow, generate...

article

Flow–seaweed interactions: a laboratory study using blade models

Davide Vettori, Vladimir Nikora

Environmental Fluid Mechanics > 2018 > 18 > 3 > 611-636

Flow–vegetation interactions is an interdisciplinary research area with applications in the management of coastal waters, lakes, and watercourses. Due to an emerging interest in the cultivation of seaweeds, this study seeks to develop a sound understanding of the physical interactions between flow and seaweeds. This is achieved via experiments in a laboratory flume using plastic-made models of blades...

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Environmental Fluid Mechanics

Simulation-based optimization of in-stream structures design: rock vanes

Wind-induced pressure at a tunnel portal

Analytical solution of two-dimensional advection–dispersion equation with spatio-temporal coefficients for point sources in an infinite medium using Green’s function method

A high resolution measurement of the morning ABL transition using distributed temperature sensing and an unmanned aircraft system

Effect of atmospheric boundary layer stability on the inclination angle of turbulence coherent structures

On force consideration in coupled ISPH framework for sediment transport in presence of free-surface flow

Part I : a priori study of erosion and deposition with large eddy simulation of turbulent flow over multiple 2D sandy Gaussian hills

Numerical study of aerosols motion and deposition outside and inside buildings with different geometries

Enhancing transverse mixing in streams with submerged vanes

Flow–seaweed interactions: a laboratory study using blade models

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