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Turbulent Flow Simulations: Laboratory and Numerical Modelling of Turbulent Flows

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A3: Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: closed (15 December 2021) | Viewed by 5274

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Special Issue Editors

Prof. Dr. Simone Ferrari

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Guest Editor

Department of Civil-Environmental Engineering and Architecture (DICAAR), University of Cagliari, 09123 Cagliari, Italy
Interests: experimental and numerical study of turbulent and turbulent-like flows in the environmental, civil, industrial, and biomedical fields (among others: turbulent jets and plumes, interaction of breakwaters with waves, in vitro cardiovascular flows); urban microclimate design (air quality, pollutant dispersion, outdoor human comfort, and energetic optimization in the built environment); sea discharges (study and optimization of diffusers and outfalls for sea discharge of pollutants, such as brine from desalination plants); design and development of non-intrusive image-based velocity, acceleration, and concentration measurement techniques for turbulent flows; flow modeling and control for mixing optimization; bio-fluid dynamics (laboratory simulation of cardiac flows and flow in the human eye)
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Dr. Annalisa Di Bernardino

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Guest Editor

Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
Interests: atmospheric boundary layer; air quality monitoring; remote sensing; climate change; urban climate; turbulence; atmospheric dynamics; ground-based atmospheric monitoring
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Energies on the subject area of “Turbulent Flow Simulations”. Turbulence is still an unsolved issue with enormous implications on energy consumption reductions and efficient use of energy. This is true in several fields, from the turbulent wakes on moving objects to the accumulation of heat in the built environment or the optimization of the performances of heat exchangers or mixers. For these reasons, recent advances on turbulent flow simulations, via both laboratory and numerical modeling, can lead to new advances in the knowledge of the problem and, as a consequence, to the optimization on the use of energy.

This Special Issue will deal with novel techniques for turbulent flow simulations and with simulations of topics of interest for the Energies community. Topics of interest for publication include but are not limited to:

Experimental and numerical simulations of turbulent flows in the environmental, civil, and industrial fields;
Laboratory simulations and measurement techniques;
Numerical simulation techniques for turbulent flows;
Urban microclimate design;
Turbulent flow control;
Drag and wake reduction;
Optimization of mixers and/or heat exchangers;
Jets and plumes.

Prof. Dr. Simone Ferrari
Dr. Annalisa di Bernardino
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Turbulent flow
Laboratory experiments
Numerical simulations
Microclimate design
Mixing
Heat exchange
Jets

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Published Papers (2 papers)

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Research

22 pages, 9232 KiB

Open AccessArticle

A Novel Automatic Method for the Urban Canyon Parametrization Needed by Turbulence Numerical Simulations for Wind Energy Potential Assessment

by Luca Salvadori, Annalisa Di Bernardino, Giorgio Querzoli and Simone Ferrari

Energies 2021, 14(16), 4969; https://doi.org/10.3390/en14164969 - 13 Aug 2021

Cited by 4 | Viewed by 1756

Abstract

The energy transition to more sustainable forms is currently ongoing worldwide, because of the environmental impacts produced by the non-renewable energy sources employed in the last decades. Among the main alternatives, wind plays a key role and, nowadays, innovative instruments, such as small-scale turbines allow for installation of wind turbines in urban areas. Their energy potential assessment requires high-accuracy simulations of the turbulent flows in the urban canopy layer, which, in turn, require detailed information about the geometrical properties of the basic element to classify urban surfaces, i.e., the urban canyon, often not available. In this work, we propose a novel automatic method, based on Voronoi graph, to univocally identify urban canyons and to extract their geometrical parameters from online available GIS (Geographic Information System) data, and test it on four European cities that differ in size, story and location. Results show the capability of the method to identify the single urban canyon and to properly extract its geometrical parameters, which tend to assume similar values for the largest cities. Moreover, we first attempt to propose and test some curves to generally describe the data probability distribution, which may be useful for turbulence simulations for urban wind energy assessment and planning. The best results are found for the canyon aspect ratio. Full article

(This article belongs to the Special Issue Turbulent Flow Simulations: Laboratory and Numerical Modelling of Turbulent Flows)

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22 pages, 2880 KiB

Open AccessArticle

Large-Eddy Simulation Analyses of Heated Urban Canyon Facades

by Carlo Cintolesi, Francesco Barbano and Silvana Di Sabatino

Energies 2021, 14(11), 3078; https://doi.org/10.3390/en14113078 - 25 May 2021

Cited by 12 | Viewed by 2465

Abstract

Thermal convective flows are common phenomena in real urban canyons and strongly affect the mechanisms of pollutant removal from the canyon. The present contribution aims at investigating the complex interaction between inertial and thermal forces within the canyon, including the impacts on turbulent features and pollutant removal mechanisms. Large-eddy simulations reproduce infinitely long square canyons having isothermal and differently heated facades. A scalar source on the street mimics the pollutant released by traffic. The presence of heated facades triggers convective flows which generate an interaction region around the canyon-ambient interface, characterised by highly energetic turbulent fluxes and an increase of momentum and mass exchange. The presence of this region of high mixing facilitates the pollutant removal across the interface and decreases the urban canopy drag. The heating-up of upwind facade determines favourable convection that strengthens the primary internal vortex and decreases the pollutant concentration of the whole canyon by

49 %

compare to the isothermal case. The heating-up of the downwind facade produces adverse convection counteracting the wind-induced motion. Consequently, the primary vortex is less energetic and confined in the upper-canyon area, while a region of almost zero velocity and high pollution concentration (

40 %

more than the isothermal case) appears at the pedestrian level. Finally, numerical analyses allow a definition of a local Richardson number based on in-canyon quantities only and a new formulation is proposed to characterise the thermo-dynamics regimes. Full article