Physical Review Fluids

Author(s): Hiromichi Kobayashi and Toshiyuki Gotoh

Cloud supersaturation is modeled as a passive scalar with a phase-relaxation time under a uniform vertical gradient. Large eddy simulations with grid points of 10243 confirm the theoretical prediction that one −5/3 spectrum by the phase relaxation and another by the turbulence cascade coexist at low and high wavenumbers in the inertial range, respectively. As the phase relaxation time becomes shorter the transition wavenumber between the two ranges shifts to higher wavenumbers, consistent with theory. Probability density function tails of the supersaturation at small-scales become longer than that of the velocity, stronger intermittency, as the phase relaxation time becomes longer.

[Phys. Rev. Fluids 11, 064613] Published Thu Jun 18, 2026

Author(s): Tymoteusz Miara, Draga Pihler-Puzović, Matthias Heil, and Anne Juel

We characterize the three-dimensional shape of an elastic, transparent sheet as it translates, rotates, and deforms - a key experimental challenge in the study of particle-laden flows – with a high-resolution, single-camera method. We scan the object nonintrusively to capture its illuminated surface and couple the space-time representation of its surface with a neural autoencoder to reconstruct the 3D shape of the object. This method enables the study of motion and deformation of objects with a wide range of surface geometries.

[Phys. Rev. Fluids 11, 064901] Published Thu Jun 18, 2026

Author(s): Hiroshi Otomo and Alexander J. Wagner

Lattice Boltzmann models for nonideal fluids rely on mesoscopic force formulations whose connection to microscopic physics remains unclear. By constructing lattice Boltzmann distribution functions directly from molecular dynamics simulations, this work provides a framework for assessing force models against microscopic particle behavior. The analysis shows that a balanced combination of pseudopotential and free-energy formulations best reproduces the moments of the molecularly derived distribution functions, establishing a direct link between microscopic dynamics and mesoscopic fluid modeling.

[Phys. Rev. Fluids 11, L062901] Published Thu Jun 18, 2026