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Author(s): Eric Lauga and Beverley McKeon [Phys. Rev. Fluids 11, 060001] Published Fri Jun 05, 2026

Author(s): Francesca Mangani, Alessio Roccon, and Alfredo Soldati Oil–water emulsions exhibit viscosity contrasts that can significantly influence scalar transport and mixing. Using phase-field-based direct numerical simulations, we investigate the role of viscosity on the transient evolution of a passive scalar (temperature), initially confined in the dispersed phase and subsequently transferred to the carrier phase, in two opposite configurations...

Author(s): Yijie Wang, Jun Chen, and Leonardo P. Chamorro Turbulence subjected to background rotation underlies many geophysical and engineering flows, yet its anisotropic development away from the rotation axis remains poorly constrained experimentally. This laboratory study examines nearly isotropic turbulence under controlled off-axis rotation using high-resolution PIV, revealing how rotation induces scale-dependent anisotropy in directional...

Author(s): Yonghao Wen, Yingjie Wei, Cong Wang, and Jiawen Yin The present study extends existing investigations of waves generated by granular collapse into water from two-dimensional configurations to three-dimensional axisymmetric cases, revealing both similarities and fundamental differences between them. Wave-generation mechanisms are proposed, demonstrating that the competition between horizontal and vertical granular flow governs the transition...

Author(s): Dušan Božić, Anubhav Dwivedi, and Mihailo R. Jovanović Subcritical transition in shear flows arise from the interplay between linear non-modal amplification and nonlinear interactions, yet their quantitative connection remains unresolved. We bridge this gap by deriving a framework from the Navier–Stokes equations, in which a forcing-amplitude expansion links oblique disturbances to finite-amplitude streaks consistent with direct numerical...

Author(s): Fabio Guglietta, Martino Andrea Scarpolini, Francesco Viola, and Luca Biferale Blood flow in the human heart is far from a smooth stream: it is a rapidly changing, intermittent motion shaped by moving walls, valves, and pulsatile forcing. By following Lagrangian tracers through a patient-specific simulation of the left heart, this study reveals where and when turbulent fluctuations become most intense. The results show that Lagrangian...

Author(s): Antoine Parrenin, Cees van Rijn, and Daniel Bonn The characteristic fanning out of spray clouds, whether spraying perfume or spray painting, is familiar. We studied spray cloud formation for parallel jet nozzles as a function of the pressure of the surrounding air. Our microfabricated nozzles with parallel 4μm holes produce multiple microjets; we find that these form conical spray clouds via air friction through a Kelvin-Helmholtz instability...