130 papers
Direct numerical simulations of plane Couette-Poiseuille flow near the transition to turbulence reveal that streak waviness acts as a quadratic function of roll amplitude when the latter is sufficiently large, thereby validating a critical component of Waleffe's self-sustaining process model.
This paper investigates shear-driven wave generation in a two-fluid system with an exponential velocity profile, revealing a novel transition from Kelvin-Helmholtz to Holmboe and finally to Miles critical layer instabilities as the density ratio decreases, a finding validated by both linear theory and nonlinear simulations that demonstrate the first unified observation of all three canonical instabilities within a single background state.
This paper investigates third-order deep-water wave-induced drift using a reduced Hamiltonian formulation, revealing that while classical Stokes drift slightly misestimates particle motion, incorporating difference harmonic terms significantly improves agreement with nonlinear trajectory calculations across various sea states.
This paper presents an exact Eulerian framework for computing the topological entropy of stationary three-dimensional turbulence using only local strain-rate eigenvalue distributions and decorrelation times obtainable from a single fixed probe, thereby eliminating the need for challenging Lagrangian particle tracking.
This paper introduces "Pufflets" as inertial counterparts to Stokeslets to demonstrate that metachronal waves of cilia can drive highly efficient particle transport through inertial coasting, a mechanism impossible in low-Reynolds-number Stokes flow.
This paper reviews analytical methods for solving low-Reynolds-number wedge and corner flow problems using the Papkovich-Neuber representation and the Fourier-Kontorovich-Lebedev integral transform to characterize Stokeslet and rotlet solutions for applications in microfluidics and confined hydrodynamics.
This study demonstrates that Denoising Diffusion Probabilistic Models (DDPMs) and their latent-space variants (LDMs) provide high-accuracy, computationally efficient frameworks for predicting complex physical fields, including thermal distributions and flow regimes ranging from incompressible to hypersonic.
This paper derives refined hydrodynamic models for lipid bilayers that incorporate a scalar order parameter to account for molecular alignment, resulting in surface Landau–Helfrich and Beris–Edwards models for asymmetric and symmetric bilayers respectively, which generalize and provide an alternative derivation for existing surface Navier–Stokes–Helfrich models.
This study combines experimental diagnostics and a validated coupled RANS-LES CFD framework to quantify how incident shock attenuation and boundary-layer interactions create significant axial and radial thermodynamic non-uniformities behind reflected shocks in single-diaphragm shock tubes, revealing that while argon maintains a relatively uniform core, nitrogen and carbon dioxide exhibit substantial gradients that impact chemical kinetic measurements.
This paper establishes the local-in-time existence of strong solutions to the gravity water wave kinetic equation by rigorously deriving a sharper bound for the collision kernel's growth in the highly non-local regime and utilizing this improved estimate to overcome the associated singular integral challenges.
This paper presents a scalable, two-step framework that propagates chemical kinetics parameter uncertainties onto reduced manifolds to enable efficient, spatially resolved uncertainty quantification in high-fidelity reacting flow simulations, revealing significant variability in trajectory and equilibrium times driven by mixing and low-to-intermediate temperature chemistry.
This paper presents a novel, fully geometric, and conservative 3D Volume-of-Fluid method that combines a modified advection scheme for mixed cells with a height-function-based contact angle imposition to accurately simulate moving contact lines with hysteresis on complex embedded boundaries while overcoming severe time-step limitations.
Using molecular dynamics simulations and a validated one-dimensional theoretical framework, this study reveals that ion adsorption at the water-silica interface generates molecular-scale roughness and additional friction, significantly increasing apparent viscosity and governing ultra-confined ionic transport in wetting films.
This study combines experimental measurements with linear modeling to reveal that low-frequency coherent structures in separated turbulent flow over a Gaussian bump are driven by a three-dimensional zero-frequency modal instability and finite-span standing-wave dynamics, offering a physical explanation for discrepancies between simulations and experiments while highlighting the critical need for adequate spanwise domain sizes in numerical studies.
This paper presents an improved mechanistic model for wave energy attenuation in drifting sea ice that accounts for ice-water drag, successfully replicating observed non-exponential decay profiles and spatial variations in attenuation rates that traditional exponential models fail to capture.
This study introduces a computational framework combining Design-by-Morphing and Bayesian optimization to generate undulatory swimming profiles that achieve 16%–35% higher propulsive efficiency than traditional anguilliform and carangiform modes by optimizing kinematic parameters and redistributing energy through favorable surface stress distributions.
This study investigates autocatalytic reaction fronts in turbulent aqueous flows using oscillating grids and optical diagnostics, revealing distinct propagation regimes and demonstrating that even minor density differences significantly influence front dynamics by coupling chemical kinetics with flow-induced mixing.
This paper investigates the motion of compressible, inviscid fluid on a rotating sphere by presenting hodograph equations that yield a class of solutions parameterized by two arbitrary functions, providing explicit examples, describing blow-up curves, and analyzing limiting cases of rotation speeds.
This paper reviews the analogue gravity description of unidirectional water waves in two-dimensional flows with constant shear, demonstrating that such flows can be effectively modeled by a curved spacetime metric without requiring prior knowledge of general relativity.
This study presents a robust quantitative framework combining Mach-Zehnder interferometry with humidity-controlled confinement to precisely map the drying kinetics and internal concentration fields of water-glycerol droplets, successfully validating a diffusion-controlled evaporation model and extracting concentration-dependent transport properties while confirming that mass diffusion dominates over buoyancy-driven convection.