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Symmetry
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Symmetry and Asymmetry in Experimental and Computational Fluid Dynamics
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Symmetry and Asymmetry in Experimental and Computational Fluid Dynamics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Mathematics".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 2310

Special Issue Editors

Dr. Grzegorz Ligus

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland
Interests: hydrodynamics and aerodynamics of industrial devices using the PIV (Particle Image Velocimetry) method
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Marek Ochowiak

E-Mail Website
Guest Editor
Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Interests: multiphase flows; separation processes; atomization; sprays; mixing; chemical technology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

A large number of flow phenomena, under the influence of external factors, adopt a symmetric/asymmetric nature. This is often a key feature for the high efficiency of certain processes. For this reason, knowledge of the control of symmetry mechanisms is becoming vitally necessary in practically every field of science and engineering. The existence of difficulties, for example, in the form of irregularities in the implementation of processes or maldistribution of fluids, among others, has its source in the disturbance or lack of the symmetry of one or more factors, parameters, gradients, etc. The challenges of creating or restoring symmetry then become crucial for the efficiency of such processes. On the other hand, in fluid mechanics, we are also familiar with processes in which increasing efficiency requires the opposite operation, that is, counteracting the natural tendency to create symmetry. In consequence, symmetry/asymmetry of fluid flow has become a frequent area of discussion in experimental and computational fluid mechanics. The availability of many advanced measurement techniques as well as computational models makes it possible to successfully identify and investigate the factors that determine symmetry and asymmetry.

This Special Issue covers all aspects of the use of experimental and computational fluid mechanics in the fields of visualization, identification, analysis, and assessment of symmetry/asymmetry of the studied flow phenomena. In particular, we would like to point out—not exhaustively described in the literature—the problems of symmetry/asymmetry in the areas:

  • Single and multiphase flows;
  • Flow structures and patterns;
  • Atomization and spray;
  • Heat and mass transfer;
  • Maldistribution of fluids;
  • Vortex hydrodynamics;
  • Separation and mixing processes;
  • Development of experimental and computational fluid dynamics.

The topics of study are not limited to the above issues. If you can bring a fresh perspective to the research of symmetry/asymmetry based on experimental or computational fluid dynamics, you are particularly invited to submit to this issue.

Dr. Grzegorz Ligus
Prof. Dr. Marek Ochowiak
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. Symmetry 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 2400 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

  • fluid flow
  • multiphase flow
  • atomization
  • spray
  • heat and mass transfer
  • flow pattern
  • flow structure
  • maldistribution
  • vortex hydrodynamics
  • separation
  • mixing
  • experimental fluid dynamics
  • computational fluid dynamics

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

14 pages, 2705 KiB  
Article
Towards a Dynamic Compartmental Model of a Lamellar Settler
by Tamás Karches
Symmetry 2023, 15(4), 864; https://doi.org/10.3390/sym15040864 - 5 Apr 2023
Cited by 8 | Viewed by 1766
Abstract
Lamellar settlers are widely used in solid separation due to their relative high surface area paired with a small tank volume. Settlers exposed to high load variations may change their settling properties based on the variation of the flow pattern. Applying the critical [...] Read more.
Lamellar settlers are widely used in solid separation due to their relative high surface area paired with a small tank volume. Settlers exposed to high load variations may change their settling properties based on the variation of the flow pattern. Applying the critical point theory and coherent structure concept, a flow topology analysis was performed with the help of computational fluid dynamic simulations. The compartments were determined by the fluid flow, and the dynamic behavior of the compartments was taken into account. Under normal diurnal load variation, the architecture of the compartments did not change, in contrast to the mass transport between the zones, whereas the sludge removal process made significant changes in the architecture. The results showed two main flow zones with significant internal recirculation in the first zone. The hydraulic surface loading was examined in each zone, and the study revealed that the actual hydraulic load could be from 1.5 to 4.5 times much higher than that in individual zones due to recirculation eddies in the reactor tanks. The design hydraulic loading rate did not consider the local flow pattern. The discrete phase model approximation provided acceptable results, and the extent of the recirculation zone changed stepwise with different loads. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Experimental and Computational Fluid Dynamics)
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20 pages, 8274 KiB  
Article
The Impact of Increasing the Length of the Conical Segment on Cyclone Performance Using Large-Eddy Simulation
by Satyanand Pandey and Lakhbir Singh Brar
Symmetry 2023, 15(3), 682; https://doi.org/10.3390/sym15030682 - 8 Mar 2023
Cited by 6 | Viewed by 2277
Abstract
In cyclone separators, the asymmetrical coherent structure significantly influences the velocity fluctuations and hence the cyclone performance. This asymmetric rotating vortex in the core region precesses around the cyclone axis with a frequency that depends on the cyclone geometry and operating conditions. In [...] Read more.
In cyclone separators, the asymmetrical coherent structure significantly influences the velocity fluctuations and hence the cyclone performance. This asymmetric rotating vortex in the core region precesses around the cyclone axis with a frequency that depends on the cyclone geometry and operating conditions. In the present work, we studied the impact of increasing the length of the conical segment on the performance of cyclone separators as well as the precessing frequency of the asymmetrical structure. For this, five different cone lengths were considered such that the total cyclone length equalled 3.0D, 3.5D, 4.0D, 4.5D, and 5.0D (here, D is the main body diameter of the cyclone). The study was performed at three different inlet velocities, viz. 10, 15, and 20 m/s. Throughout the work, the angle of the conical segment was held fixed and resembled the reference model (which had a total cyclone length equal to 4.0D). The cyclone performance was evaluated using advanced closure large-eddy simulation with the standard Smagorinsky subgrid-scale model. Conclusive results indicate that with an increase in the cone length, the pressure losses reduce appreciably with small variations in the collection efficiency, followed by a reduction in the precessing frequency of the asymmetric vortex core. The results further indicate that the apex cone angle (or the bottom opening diameter) must be carefully adjusted when increasing the cone length. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Experimental and Computational Fluid Dynamics)
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