Compressible Flows

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

Deadline for manuscript submissions: 31 August 2025 | Viewed by 1248

Special Issue Editors


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Guest Editor
Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131 Padova, Italy
Interests: compressible flows in turbomachinery; scale-resolved CFD methods; wall-resolved and wall-modeled large-eddy simulations; internal and external fluid dynamics problems; high-performance computing in CFD
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Guest Editor Assistant
Department of Industrial Engineering, Università degli Studi di Padova, 35131 Padova, Italy
Interests: computational fluid dynamics; waterjet propulsion; optimization; fluid dynamic design; turbomachinery; two-phase modeling; high-performance computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, fluid dynamics has undergone a profound transformation, driven by the widespread adoption of computational fluid dynamics methods, the relentless evolution of high-performance numerical algorithms, and the increasing integration of advanced experimental activities. However, detailed and comprehensive numerical descriptions of compressible or shock-dominated flows or accurate experimental campaigns represent a real challenge in contemporary engineering sectors. The following are a few examples of compressible streams that play a crucial role in engineering prototyping and design methodologies. First and foremost, in the aerospace sector, compressible flows are a keystone in the design and operation of both aircraft and spacecraft. They are pivotal in optimizing the aerodynamic performance influencing the design of airfoils, nozzles, and propulsion systems. In automotive engineering, instead, they underpin the development of efficient engines, exhaust systems, and turbochargers. Even within the energy sector, adequately addressing compressible flows is indispensable as they inform the design and operation of gas turbines, natural gas pipelines, and supersonic compressors. Knowledge on compressible streams is critical for transporting natural gas over long distances, considering the behavior of gases under varying pressures and temperatures. Additionally, in environmental engineers, compressibility can occur concerning, for instance, air pollution dispersion and how pollutants disperse in the atmosphere at different altitudes and under various weather conditions. Finally, we cannot fail to mention that recent hypersonic technologies, including advanced aircraft and space vehicles, are the subject of ongoing studies intending to revolutionize transportation. 

Thus, this Special Issue aims to explore various topics related to compressible flows from a broad perspective. In particular, the intention is for this Special Issue to provide a platform for authors in compressible flow engineering to submit their work, whether it involves validating or analyzing numerical models in academic or real-world scenarios or proposing new experimental methods to investigate the complexities behind compressible flow deployments.

Thus, authors are strongly encouraged to contribute innovative ideas in the realm of compressible flow modeling or experimental investigations, which may encompass developing novel numerical approaches or introducing fresh experimental paradigms. Consequently, the potential topics for this Special Issue encompass, but are not confined to, the following areas:

  1.  RANS/LES/DNS simulations of compressible flows;
  2.  Gas turbine technologies;
  3.  Modeling of aerodynamics and turbomachinery;
  4.  Rigorous validation of numerical experimental methods;
  5.  Exploration of super/hypersonic flows;
  6.  Cutting-edge optimization strategies.

Dr. Francesco De Vanna
Guest Editor

Dr. Filippo Avanzi
Guest Editor Assistant

Manuscript Submission Information

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Keywords

  • computational fluid dynamics
  • compressible flow solvers
  • turbomachinery performance testing
  • turbomachinery efficiency analysis
  • high-speed imaging
  • shock–turbulence interaction
  • parallel computing
  • pressure-sensitive paint techniques
  • supersonic and hypersonic experiments

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Published Papers (1 paper)

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Research

21 pages, 1511 KiB  
Article
Parametric Instabilities in Time-Varying Compressible Linear Flows
by Ioannis Kiorpelidis and Nikolaos A. Bakas
Fluids 2025, 10(1), 18; https://doi.org/10.3390/fluids10010018 - 18 Jan 2025
Viewed by 375
Abstract
The stability of time-dependent compressible linear flows, which are characterized by periodic variations in either their shape or their shear, is investigated. Two novel parametric instabilities are found: an instability that occurs for periodically wobbling elliptic vortices at a number of discrete oscillation [...] Read more.
The stability of time-dependent compressible linear flows, which are characterized by periodic variations in either their shape or their shear, is investigated. Two novel parametric instabilities are found: an instability that occurs for periodically wobbling elliptic vortices at a number of discrete oscillation frequencies that are proportional to the Mach number and an instability that occurs for all linear flows at various frequencies of the shear oscillation that depend on the Mach number. In addition, the physical mechanism underlying the instabilities is explained in terms of the linear interaction of three waves with time-varying wavevectors that describe the evolution of perturbations: a vorticity wave representing the evolution of incompressible perturbations and two counter-propagating acoustic waves. Elliptical instability occurs because the scale of the acoustic waves decreases exponentially and their wave action is conserved, leading to an exponential increase in the acoustic waves’ energies. The instability in shear-varying flows is driven by the interaction between vorticity and the acoustic waves, which couple through the shear and for specific frequencies resonate parametrically, leading to exponential or linear growth. Full article
(This article belongs to the Special Issue Compressible Flows)
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