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Fluids, Volume 9, Issue 4

April 2024 - 19 articles

Cover Story: This study investigates the potential of deep reinforcement learning (DRL) as a black-box optimizer for turbulence model identification. We augment the Spalart–Allmaras turbulence model by incorporating a DRL-identified source term. The algorithm is trained to align the augmented RANS model velocity fields with time-averaged Large Eddy Simulation (LES) mean fields of a turbulent round jet flow at a Reynolds number of 10,000, achieving a 48% improvement in alignment. Furthermore, the framework also performs well on unseen data of the same configuration at a higher Reynolds number, demonstrating that DRL is a promising method for RANS closure model identification. View this paper
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Articles (19)

  • Article
  • Open Access
3 Citations
1,736 Views
13 Pages

Nonlinear Approach to Jouguet Detonation in Perpendicular Magnetic Fields

  • Andriy A. Avramenko,
  • Igor V. Shevchuk,
  • Margarita M. Kovetskaya,
  • Yulia Y. Kovetska and
  • Andrii I. Tyrinov

20 April 2024

The focus of this paper was Jouguet detonation in an ideal gas flow in a magnetic field. A modified Hugoniot detonation equation has been obtained, taking into account the influence of the magnetic field on the detonation process and the parameters o...

  • Article
  • Open Access
3 Citations
2,334 Views
31 Pages

Analysis of MAV Rotors Optimized for Low Noise and Aerodynamic Efficiency with Operational Constraints

  • Pietro Li Volsi,
  • Gianluigi Brogna,
  • Romain Gojon,
  • Thierry Jardin,
  • Hélène Parisot-Dupuis and
  • Jean-Marc Moschetta

19 April 2024

The rapid growth of drone use in urban areas has prompted authorities to review airspace regulations, forcing drone manufacturers to anticipate and reduce the noise emissions during the design stage. Additionally, micro air vehicles (MAVs) are design...

  • Article
  • Open Access
2 Citations
1,535 Views
11 Pages

19 April 2024

Stochastization of boundary-layer flow has a dramatic effect on the aerodynamic characteristics of wings, nacelles, and other objects frequently encountered in practice, resulting in higher skin-friction drag and worse aerodynamic quality. A swept-wi...

  • Article
  • Open Access
13 Citations
2,521 Views
21 Pages

Darcy–Brinkman Model for Ternary Dusty Nanofluid Flow across Stretching/Shrinking Surface with Suction/Injection

  • Sudha Mahanthesh Sachhin,
  • Ulavathi Shettar Mahabaleshwar,
  • David Laroze and
  • Dimitris Drikakis

18 April 2024

Understanding of dusty fluids for different Brinkman numbers in porous media is limited. This study examines the Darcy–Brinkman model for two-dimensional magneto-hydrodynamic fluid flow across permeable stretching/shrinking surfaces with heat t...

  • Article
  • Open Access
1 Citations
2,259 Views
23 Pages

18 April 2024

High-flow nasal cannula (HFNC) is becoming the gold standard to treat respiratory distress at any age since it potentially provides several significant clinical advantages. An obstacle to the diffusion of this simple and effective system of oxygen th...

  • Article
  • Open Access
1 Citations
2,224 Views
22 Pages

17 April 2024

In this study, the unsteady Reynolds-averaged Navier–Stokes (URANS) equations are employed in conjunction with the Menter Shear Stress Transport (SST)-Scale-Adaptive Simulation (SAS) turbulence model in compressible flow, with an unstructured m...

  • Article
  • Open Access
6 Citations
2,868 Views
27 Pages

15 April 2024

Given the increasing role of computational fluid dynamics (CFD) simulations in the aerothermal design of gas turbine vanes and blades, their rigorous validation is becoming more and more important. This article exploits an experimental database obtai...

  • Article
  • Open Access
2,574 Views
11 Pages

A Compressible Formulation of the One-Fluid Model for Two-Phase Flows

  • Simon El Ouafa,
  • Stephane Vincent,
  • Vincent Le Chenadec,
  • Benoît Trouette,
  • Syphax Fereka and
  • Amine Chadil

12 April 2024

In this paper, we introduce a compressible formulation for dealing with 2D/3D compressible interfacial flows. It integrates a monolithic solver to achieve robust velocity–pressure coupling, ensuring precision and stability across diverse fluid...

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Fluids - ISSN 2311-5521