Symmetry and Numerical Methods in Fluid Dynamics

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

Deadline for manuscript submissions: 31 October 2025 | Viewed by 747

Special Issue Editor


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Guest Editor
Faculty of Water Science, Ludovika University of Public Service, 6500 Baja, Hungary
Interests: fluid dynamics; fluid flow; modeling and simulation

Special Issue Information

Dear Colleagues,

The majority of flow phenomena exhibit either symmetric or asymmetric behavior, which is often crucial for optimizing various processes. Understanding the control of symmetry mechanisms has become essential across scientific and engineering disciplines. Challenges arise from irregularities or fluid misallocation, typically stemming from disrupted symmetries in factors, parameters, or gradients. Thus, addressing and maintaining symmetry is paramount for process efficiency. Conversely, in fluid mechanics, enhancing efficiency may require deliberate disruption of symmetry. Consequently, discussions in experimental and computational fluid mechanics frequently revolve around fluid flow symmetry/asymmetry. Numerical methods play a vital role in revealing the complexities of fluid dynamics, providing insights into the behavior of symmetric and asymmetric flows.

This Special Issue aims to explore the symmetry concept of computational fluid dynamics, focusing specifically on refining numerical methods. By pushing the boundaries of simulation techniques and analysis, it seeks to enhance the understanding of fluid behavior and optimize processes across diverse applications.

In this Special Issue, original research articles and reviews are welcome. Research areas may include, but are not limited to, the following:

  • Steady-state/transient flows
  • Multiphase flows
  • Flow topology analysis
  • Numerical methods in fluid flow
  • Heat and mass transfer
  • Mixing and mixedness
  • Stability/instability

We look forward to receiving your contributions.

Dr. Tamás Karches
Guest Editor

Manuscript Submission Information

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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.

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Keywords

  • steady-state/transient flows
  • multiphase flows
  • flow topology analysis
  • numerical methods in fluid flow
  • heat and mass transfer
  • mixing and mixedness
  • stability/instability

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Published Papers (1 paper)

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Research

17 pages, 3327 KB  
Article
Hydraulic Flow Patterns in an On-Site Wastewater Treatment Unit Under Various Operating Conditions
by Tamás Karches and Tamás Papp
Symmetry 2025, 17(8), 1190; https://doi.org/10.3390/sym17081190 - 25 Jul 2025
Viewed by 253
Abstract
The role of on-site wastewater treatment (OSWT) is increasingly important for water reuse and local sustainability, but treatment efficiency is highly dependent on hydraulic behavior and mixing. This study used validated CFD simulations and tracer experiments to analyze flow patterns and mixing performance [...] Read more.
The role of on-site wastewater treatment (OSWT) is increasingly important for water reuse and local sustainability, but treatment efficiency is highly dependent on hydraulic behavior and mixing. This study used validated CFD simulations and tracer experiments to analyze flow patterns and mixing performance in a six-zone OSWT unit under different operational scenarios, including inflow, aeration, recirculation, combined mechanisms, and closed-loop operation without inflow. The results show that influent flow is essential for maintaining convective transport and system-wide momentum, while aeration and recirculation enhance local mixing, but cannot fully overcome geometric dead zones. The combined use of inflow, aeration, and recirculation achieved the highest mixing efficiency and minimized the dead volume, whereas scenarios lacking inflow exhibited severe stagnation and expanded dead zones. These findings highlight the need to integrate hydraulic interventions with thoughtful reactor design to ensure effective and resilient small-scale wastewater treatment systems. Full article
(This article belongs to the Special Issue Symmetry and Numerical Methods in Fluid Dynamics)
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