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Fluids
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Atmospheric Flows
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Atmospheric Flows

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Geophysical and Environmental Fluid Mechanics".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 2243

Special Issue Editor

Dr. Zeljko Vecenaj

E-Mail Website
Guest Editor
Department of Geophysics, Faculty of Science, University of Zagreb, Horvatovac 95, 10000 Zagreb, Croatia
Interests: atmospheric boundary layers; atmospheric turbulence; severe downslope winds; airflow above complex terrains; data (non)stationarity; advanced mathematical and statistical atmospheric data analysis

Special Issue Information

Dear Colleagues,

Continuous efforts have focused on studying atmospheric flows, largely due to the never-ending attempt to improve the performance of numerical weather prediction (NWP) and climate models. It is near impossible to carry out such work without performing measurements and simulations of atmospheric flows and subjecting those two to a synergy. While NWP and climate models can successfully simulate the large-scale dynamics of atmospheric flows today, microscale dynamics and turbulence still represent a great need for improvement through the revision of existing and development of novel turbulence parameterization schemes. This Special Issue will focus on the challenges we encounter in microscale dynamics, which are associated with the study of atmospheric flows over complex terrain, such as downslope winds with mountain wave breaking, extreme gusts, and lee rotors; up- and down-valley flows; extremely stable and unstable boundary layers; near-surface coherent structures; revisiting existing and/or proposing new surface scaling equations considering the (non)stationarity of data; etc.

Dr. Zeljko Vecenaj
Guest Editor

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. Fluids is an international peer-reviewed open access monthly 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 1800 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

  • measurements of atmospheric flows 
  • NWP simulations of atmospheric flows 
  • atmospheric stable/unstable boundary layers 
  • atmospheric turbulence 
  • complex terrain 
  • downslope winds 
  • up-valley/down-valley flows 
  • data (non)stationarity

Published Papers (1 paper)

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Research

14 pages, 23731 KiB  
Article
Estimation of Turbulent Triplet Covariances for Bora Flows
by Željko Večenaj, Barbara Malečić and Branko Grisogono
Fluids 2021, 6(12), 452; https://doi.org/10.3390/fluids6120452 - 13 Dec 2021
Cited by 1 | Viewed by 1824
Abstract
Bora is a strong or severe, relatively cold, gusty wind that usually blows from the northastern quadrant at the east coast of the Adriatic Sea. In this study bora’s turbulence triplet covariances were analysed, for the first time, for bora flows. The measurements [...] Read more.
Bora is a strong or severe, relatively cold, gusty wind that usually blows from the northastern quadrant at the east coast of the Adriatic Sea. In this study bora’s turbulence triplet covariances were analysed, for the first time, for bora flows. The measurements used were obtained from the measuring tower on Pometeno brdo (“Swept-Away Hill”), in the hinterland of the city of Split, Croatia. From April 2010 until June 2011 three components of wind speed and sonic temperature were measured. The measurements were performed on three heights, 10, 22 and 40 m above the ground with the sampling frequency of 5 Hz. During the observed period, total of 60 bora episodes were isolated. We analyse the terms in prognostic equations for turbulence variances. In that respect, the viscous dissipation term was calculated using two approaches: (i) inertial dissipation method (εIDM) and (ii) direct approach from the prognostic equations for variances of turbulence (εEQ). We determine that the direct approach can successfully reproduce the shape of the curve, but the values are for several orders of magnitudes smaller compared to the real data. Further, linear relationship between εIDM and εEQ was obtained. Using the results for εEQ, viscous dissipation rate in longitudinal, transversal and vertical direction was determined. It is shown that viscous dissipation has the greatest impact on bora’s longitudinal direction. The focus is on the turbulence transport term, i.e., the triplet covariance term. For the first time, it is found that turbulence transport is very significant for the intensity of near−surface bora flows. Furthermore, turbulence transport can be both positive and negative, yet intensive. It is mostly negative at the upper levels and positive at the lower levels. Therefore, turbulence transport, in most cases, takes away turbulence variance from the upper levels and brings it down to the lower ones. This is one of the main findings of this study; it adds to the understanding of peculiarities of bora wind, and perhaps some other severe winds. Full article
(This article belongs to the Special Issue Atmospheric Flows)
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