Resources

Publications

  • Author(s): Jan Diekmann and Uwe Thiele We consider the dynamics of compound drops that are formed by two immiscible, partially wetting liquids within a mesoscopic hydrodynamic description based on a gradient dynamics approach in full-curvature and long-wave variants. After discussing existing models we establish conditions between macroscopic and mesoscopic descriptions that ensure consistent Neumann and Young laws. As examples, we then numerically...
  • Author(s): Anirudh Lakshmi Narasimha Prasad and S. Unnikrishnan Supersonic over-expanded jets, common during high-speed military aircraft takeoff, generate intense noise, posing health risks to personnel. This study tests a plasma actuator-based small perturbation control mechanism to reduce noise. Results show that optimal forcing conditions can achieve over 2.5dB noise reduction with minimal thrust loss. The study also explores the mechanisms...
  • Author(s): Damiano Capocci In turbulent flows, the fluid element is deformed by chaotic motion due to the formation of sharp velocity gradients, yet an exact relationship between these deformations and kinetic energy remains elusive. In the context of incompressible and homogeneous turbulence, this work derives an exact identity connecting velocity gradient norms across the scales to kinetic energy, offering a novel decomposition in terms of strain...
  • Author(s): Sam Clarke, Jon Harrington, Simon Norris, and Andy Woods New experiments show the Rayleigh-Taylor instability in a partially soluble porous medium. An initially buoyant fluid invades from the top. As the fluid dissolves some of the solid material, it becomes dense relative to the underlying formation fluid. This leads to growth of Rayleigh-Taylor fingers at the fluid-fluid interface. We present a new theory to model the nonlinear growth...
  • Author(s): Christophe Raufaste, Lauren Rose, Stéphane Santucci, and Benjamin Dollet Liquid foams are widely used in industrial processes, yet the interplay between foam structure and flow properties remains a topic of active research. This study investigates how friction forces and confinement in quasi-two-dimensional foams influence bubble shapes during flow, revealing anisotropic deformations and curvature of the films correlated to their orientation...
  • Author(s): Mirantsoa Aimé Rasolofomanana, Romain Le Tellier, and Hervé Henry The buoyancy driven motion of a droplet that loses a component through diffusion in a fluid is studied numerically. The interplay of diffusion and advection is shown to have unexpected effects that cannot be explained in the fast or slow diffusion limit. [Phys. Rev. Fluids 10, 023601] Published Wed Feb 05, 2025
  • Author(s): Haochen Huang (黄澔辰), Pengyu Shi, Nina Elkina, Henrik Schulz, and Jie Zhang (张杰) We simulate the dynamics of a pair of three-dimensional deformable bubbles rising initially in-line and close to a vertical wall in an otherwise quiescent liquid. Our findings reveal that the wall-induced asymmetry significantly alters the evolution of the bubble paths and wakes, with horizontal separation occurring in either the wall-normal plane or the...