Resources

Author(s): R. Mathis, S. Cazin, J. Methel, F. Charru, J. Magnaudet, F. Moisy, and M. Rabaud The growth of wind-generated waves may depend on free-stream turbulence, a parameter that is generally neglected in existing models. Here, we investigate this effect experimentally using grid-generated turbulence blowing over a viscous fluid. Our results show that free-stream turbulence enhances the amplitude of three-dimensional wrinkles and lowers the...

Author(s): Yifan Ma, Chenren Chen, and Zhigang Zhai This work develops a linear model under a “total transmission” condition that isolates adjacent and cross-interface couplings in a three-interface system by suppressing reverberating waves. We then demonstrate bidirectional modulation of interface evolution by layer spacing and initial amplitude, showing that coupling can either stabilize or destabilize interfaces. Finally, we analytically derive...

Author(s): Tachin Ruangkriengsin, Günther Turk, and Howard A. Stone Resolving the near-wall motion of self-diffusiophoretic Janus particles is numerically challenging because of the steep solute concentration gradients within the narrow gap. We develop an asymptotic theory in the distinguished limit where the inert face is comparable in size to the lubrication region. For axisymmetric and slightly tilted configurations, we obtain explicit particle...

Author(s): Mrinal Jyoti Powdel and Samriddhi Sankar Ray We show that the spread of infinitesimal perturbations in a turbulent density-stratified fluid becomes slower with increasing degree of stratification. With a higher degree of stratification, the spatial growth of the uncertainty gets more and more compressed along the direction of stratification. Despite this, the temporal growth of perturbations follows the same universal behavior: an initial...

Author(s): Boqian Yan and Xiaoyu Tang While droplet impact on liquid pools is well studied for Newtonian fluids, particle suspensions introduce complex non-Newtonian dynamics. This work experimentally identifies five distinct impact regimes for cornstarch suspension droplets, revealing unique phenomena like “wrapped bubbles” and impact-induced jamming that are absent in simple fluids. Through an energy balance analysis, the authors demonstrate...

Author(s): Zhenyu Yuan (袁震宇) and Chang Shu (舒昌) We propose a moment gas kinetic flux solver (MGKFS). Like conventional GKFS, the governing equations for mass, momentum, and energy are still solved by the finite volume method (FVM). In addition, a set of evolution equations for stresses and heat fluxes are also solved by FVM, in which numerical fluxes are evaluated by high-order moments of the distribution function at cell interfaces. That is,...

Author(s): Tianpei Cheng, Haijian Yang, Mei Zhang, and Ke Xu Rayleigh–Darcy convection (RDC) in porous media controls mass and heat transfer in many geological systems. We show that permeability heterogeneity fundamentally reshapes RDC. The permeability correlation length interacts with intrinsic flow-structure scales that determine the convection pattern. High-resolution simulations reveal three distinct heterogeneity regimes depending on Rayleigh...