Recent Advances in Fluid Mechanics: Feature Papers, 2024

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1321

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Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK
Interests: convection; porous media; instability; numerical simulation; asymptotic analysis; non-Newtonian fluids
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Guest Editor
Department of Engineering, University of Campania Luigi Vanvitelli, 81031 Aversa, Italy
Interests: computational fluid dynamics; turbulence modelling and simulation; large-eddy simulation; wavelets and fluids
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to publish high-quality, long, and complete review papers in Fluids.

The Special Issue will highlight a diverse set of topics related to all aspects of fluids. The possible topics include, but are not limited to, the following list:

  • Artificial intelligence in fluid mechanics;
  • Biofluid mechanics;
  • Coherent vortical structures in fluids;
  • Marine hydrodynamics;
  • Multiphase flows;
  • Shock waves;
  • Turbulence modelling and simulation;
  • Wind-turbine aerodynamics;
  • Stability theory in fluid mechanics;
  • Geophysical fluid dynamics;
  • Granular/suspension flows;
  • Heat and mass transfer;
  • Magneto-hydrodynamics (MHD);
  • Nanofluids and microfluids;
  • Newtonian and non-Newtonian fluids;
  • Polymers;
  • Rheology;
  • Tribology/lubrication.

We consider this Special Issue to be the best forum to disseminate important research findings and share innovative ideas in the field.

Prof. Dr. D. Andrew S. Rees
Dr. Giuliano De Stefano
Guest Editors

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Published Papers (2 papers)

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Review

31 pages, 15854 KiB  
Review
Numerical Simulations of Scalar Transport on Rough Surfaces
by Zvi Hantsis and Ugo Piomelli
Fluids 2024, 9(7), 159; https://doi.org/10.3390/fluids9070159 - 11 Jul 2024
Viewed by 364
Abstract
Numerical simulations provide unfettered access to details of the flow where experimental measurements are difficult to obtain. This paper summarises the progress achieved in the study of passive scalars in flows over rough surfaces thanks to recent numerical simulations. Townsend’s similarity applies to [...] Read more.
Numerical simulations provide unfettered access to details of the flow where experimental measurements are difficult to obtain. This paper summarises the progress achieved in the study of passive scalars in flows over rough surfaces thanks to recent numerical simulations. Townsend’s similarity applies to various scalar statistics, implying the differences due to roughness are limited to the roughness sublayer (RSL). The scalar field exhibits a diffusive sublayer that increasingly conforms to the roughness surface as ks+ or Pr increase. The scalar wall flux is enhanced on the windward slopes of the roughness, where the analogy between momentum and scalar holds well; the momentum and scalar fields, however, have very different behaviours downwind of the roughness elements, due to recirculation, which reduces the scalar wall flux. Roughness causes breakdown of the Reynolds analogy: any increase in St is accompanied by a larger increase in cf. A flattening trend for the scalar roughness function, ΔΘ+, is observed as ks+ increases, suggesting the possibility of a scalar fully rough regime, different from the velocity one. The form-induced (FI) production of scalar fluctuations becomes dominant inside the RSL and is significantly different from the FI production of turbulent kinetic energy, resulting in notable differences between the scalar and velocity fluctuations. Several key questions remain open, in particular regarding the existence of a fully rough scalar regime and its characteristics. With the increase in Re and Pr, various quantities such as scalar roughness function, the dispersive fluxes, FI wall flux, etc., appear to trend towards saturation. However, the limited range of Re and Pr achieved by numerical simulations only allows us to speculate regarding such asymptotic behaviour. Beyond extending the range of Re and Pr, systematic coverage of different roughness types and topologies is needed, as the scalar appears to remain sensitive to the geometrical details. Full article
(This article belongs to the Special Issue Recent Advances in Fluid Mechanics: Feature Papers, 2024)
22 pages, 7838 KiB  
Review
Convergence towards High-Speed Steady States Using High-Order Accurate Shock-Capturing Schemes
by Juan C. Assis, Ricardo D. Santos, Mateus S. Schuabb, Carlos E. G. Falcão, Rômulo B. Freitas and Leonardo S. de B. Alves
Fluids 2024, 9(6), 133; https://doi.org/10.3390/fluids9060133 - 1 Jun 2024
Viewed by 289
Abstract
Creating time-marching unsteady governing equations for a steady state in high-speed flows is not a trivial task. Residue convergence in time cannot be achieved when using most low- and high-order spatial discretization schemes. Recently, high-order, weighted, essentially non-oscillatory schemes have been specially designed [...] Read more.
Creating time-marching unsteady governing equations for a steady state in high-speed flows is not a trivial task. Residue convergence in time cannot be achieved when using most low- and high-order spatial discretization schemes. Recently, high-order, weighted, essentially non-oscillatory schemes have been specially designed for steady-state simulations. They have been shown to be capable of achieving machine precision residues when simulating the Euler equations under canonical coordinates. In the present work, we review these schemes and show that they can also achieve machine residues when simulating the Navier–Stokes equations under generalized coordinates. This is carried out by considering three supersonic flows of perfect fluids, namely the flow upstream a cylinder, the flow over a blunt wedge, and the flow over a compression ramp. Full article
(This article belongs to the Special Issue Recent Advances in Fluid Mechanics: Feature Papers, 2024)
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