Special Issue "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 and Symmetry/Asymmetry".

Deadline for manuscript submissions: 31 March 2023 | Viewed by 659

Special Issue Editors

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
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 2000 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.


  • 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

Published Papers (1 paper)

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The Impact of Increasing the Length of the Conical Segment on Cyclone Performance Using Large-Eddy Simulation
Symmetry 2023, 15(3), 682; https://doi.org/10.3390/sym15030682 - 08 Mar 2023
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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
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