Ryan Hass,Sanjiva Lele
Ryan Hass
High-resolution large eddy simulations are conducted of locally forced, shear-free turbulence in the presence of an initially sharp density interface. The simulations are reminiscent of oscillating grid turbulence experiments used to isolat...
Aidan Blaser,Luc Lenain,Nick Pizzo
Aidan Blaser
Irrotational monochromatic surface gravity waves possess a mean Lagrangian drift which transports mass and enhances mixing in the upper ocean. In the ocean, where many surface waves are present, it is commonly assumed that the mean Lagrangi...
Enhanced Taylor-Aris dispersion in slender pulsatile annular channels: Implications for perivascular solute transport [0.03%]
细长脉动环形通道中的增强泰勒-阿里斯扩散：血管周围溶质传输的启示
Drik Sarkar,Saikat Mukherjee
Drik Sarkar
We derive expressions for the long-time effective dispersion coefficients of a solute in a slender annular channel with a spatiotemporally pulsating inner boundary. The problem is motivated by transport in perivascular spaces (PVSs) that ar...
L R Seitz,Mara A Freilich,Nick Pizzo
L R Seitz
A nonlinear stability analysis entirely in the Lagrangian frame is conducted, revealing the fundamental role of the wave-induced mean flow in modifying further wave growth and providing new insight into the classic problem of wave generatio...
Computational study of the separation of regular sphere clusters in high-Mach-number flow [0.03%]
高马赫数流场中规则球群分离现象的数值研究
Thomas Whalen,Ralf Deiterding,Stuart Jon Laurence
Thomas Whalen
A coupled computational-fluid-dynamics/finite-element methodology is implemented to investigate the free aerodynamic separation of clusters of equally sized spheres arranged in regular configurations in Mach-20 flow, representing an idealiz...
Paola Cessi
Paola Cessi
Lagrangian transit times on basin to planetary scales are controlled by the interplay of multiscale processes. The primary advective time scale is set by throughflow currents, such as interhemispheric western boundary currents. Dispersion b...
M Gallo,F Occhioni,F Magaletti et al.
M Gallo et al.
This work combines Navier-Stokes-Korteweg dynamics and rare event techniques to investigate the transition pathways and times of vapour bubble nucleation in metastable liquids under homogeneous and heterogeneous conditions. The nucleation p...
Behaviour of finite-size floating particles in free-surface turbulence [0.03%]
自由表面湍流中有限大小浮力颗粒的运动行为研究
Henri Sanness Salmon,Kelken Chang,Claudio Mucignat et al.
Henri Sanness Salmon et al.
Motivated by the need for a better understanding of marine plastic transport, we experimentally investigate finite-size particles floating in free-surface turbulence. Using particle tracking velocimetry, we study the motion of spheres and d...
Trygve Halsne,Yan Li
Trygve Halsne
Refraction is the predominant mechanism causing spatially inhomogeneous surface gravity wave fields. However, the complex interplay between depth- and current-induced wave refraction remains poorly understood. Assuming weak currents and slo...
On the role of unsteadiness in impulsive-flow-driven shear instabilities: precursors of fragmentation [0.03%]
不稳定性在冲动流驱动的剪切不稳定的中的作用：碎裂前兆
N Shen,L Bourouiba
N Shen
Shear instabilities at the interface of two fluids, such as classical Kelvin-Helmholtz instability (KHI), is the precursor of interface destabilization, leading to fluid fragmentation critical in a wide range of applications. While many ins...