Octopus-inspired design pushes ocean energy harvesting to 57%
Time-varying stiffness plus roughness strips widens the harvest band and lifts amplitude severalfold.
physics.flu-dyn
Fluid Dynamics
Turbulence, instabilities, incompressible/compressible flows, reacting flows. Aero/hydrodynamics, fluid-structure interactions, acoustics. Biological fluid dynamics, micro/nanofluidics, interfacial phenomena. Complex fluids, suspensions and granular flows, porous media flows. Geophysical flows, thermoconvective and stratified flows. Mathematical and computational methods for fluid dynamics, fluid flow models, experimental techniques.
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Neural solver maps an entire airfoil flow space in 4.6 days
No CFD labels needed: it predicts lift and drag within about 5 percent, at 40 times the cost of one simulation.
· “Solving all laminar flows around airfoils all-at-once using a parametric neural network solver”
Neural shock solver hits 0.88% error where standard PINNs give 44%
Learnable local viscosity and discontinuity-aware layers sharpen shock fronts with far fewer network parameters.
· “Discontinuity-aware KAN-based physics-informed neural networks”
A single GNN run returns a forecast plus a mask per variable
Feature-specific masks localize each variable's forecast error on climate and flow grids without sacrificing accuracy.
· “FIGNN: Feature-Specific Interpretability for Graph Neural Network Surrogate Models”
Stretchy airway mucus makes cough droplets smaller
Thin bags burst into fine, long-floating droplets, so mucus elasticity may shape infection spread.
Three sensors reconstruct a riser's full strain field
A neural operator learns the sensor locations that give the lowest forecast error on vortex-induced vibrations.
Curved-surface vortex detection frames the 2002 polar vortex split
New manifold version gives birth, death, and split dates and shows ozone-depleted air mixing poleward.
Two-soliton collisions betray the ZK equation
Inverse neural-net analysis exposes a temporary interaction; refitting the equation restores its conservation law.
Polymers at the flow centre cut instability onset by up to 1000x
Channel flow becomes unstable at Weissenberg numbers near 10 instead of 1000 when the polymer stream hugs the velocity maximum.
· “Localizing polymers promotes the centre-mode elastic instability”
Wave-particle method cuts hypersonic re-entry cost by 57 percent
It splits molecules into colliding and free-traveling groups, covering rarefied to continuum regimes in one solver.
Magnet makes droplet cooling up to 170% stronger
Simulations show the field widens the droplet's spread, stops rebound, and prolongs contact with the hot wall.
DNN predicts unseen Mach 2.5 shock from lower-Mach training
Rarefied-gas DSMC flows can be replicated in milliseconds, opening fast parametric sweeps and design studies.
· “Data-Driven Surrogate Modeling of DSMC Solutions Using Deep Neural Networks”
Sharp-interface FSI solver matches fine-grid results on coarse grids
A geometric volume-of-fluid method keeps interfaces sharp and stable, so 128x128 runs rival 1024x1024 diffusive solvers.
Peak branched-flow intensity depends on one parameter only
Closed-form equations predict scintillation maxima for coherent and partially coherent waves, with no free parameters.
Rarefaction wave, not instability, flips flame into tulip shape
Hydrogen/air and methane/air simulations trace the tulip inversion to a rarefaction wave born during flame deceleration.
· “Mechanism of tulip flame formation in highly reactive and low reactive gas mixtures”
One field-theoretic basis sets turbulence's spectral constants
Scalar diffusivity equals renormalized viscosity; Kolmogorov constants follow from the same Craya-Herring calculation.
Particle-resolved simulation now rivals lab experiments
Two decades of PR-DNS results now stand beside laboratory data for fluidized beds, settling, and sediment transport.
Shallow-water wakes are circular
Predictions for Mach stems and circular precursor fronts are confirmed by direct numerical simulation.
· “Obliquely interacting solitary waves and wave wakes in free-surface flows”
A new droplet model computes shapes on any rough surface
Surface tension and contact angle become two dials, letting rough leaves and patterned chips be simulated directly.
Nine IoT sensors locate a gas source within 20% of their spacing
A Bayesian Monte Carlo algorithm reads water-vapor hits from nine cheap sensors and pinpoints the source in minutes.
· “Enhanced Gas Source Localization Using Distributed IoT Sensors and Bayesian Inference”
Emulsions in convection obey one droplet-size law: Ra^{-1/3}
In both regimes of convecting emulsions, mean droplet size shrinks as Ra^{-1/3}, linking structure to heat transport.
Curved-film holes meet and twist into a spinning ribbon
Curved film rims cross laterally, wind into a spinning ribbon, and shed droplets at lower Weber numbers than flat films.
· “Spinning Twisted Ribbons: When Two Holes Meet on a Curved Liquid Film”
Jet turbulence predicted on a grid using 2% of DNS cells
Wave-particle closure yields the right decay rate and Reynolds stresses at Re=5000 without a finer mesh.
1D blood-vessel model proven to match 3D-1D at rate ε^{1/2}|log ε|
A new 1D integrodifferential equation tracks the coupled 3D-1D Darcy–Poiseuille system to within ε^{1/2}|log ε|.
Autoignition waves match Rayleigh flow: weak detonations exist
Equating autoignitive waves with Rayleigh flow reveals a general, shock-free route to stable weak detonations
· “Weak Detonations Revisited: Uncovering Its General Nature Using Autoignitive Reaction Wave Concept”
Recover jet-cooling heat-transfer coefficients within 8 percent
The network uses only sparse in-solid temperature readings, so no fluid simulation is needed.
Extra node check keeps shock flows positive without TVD
Checking density and pressure at solution nodes lets a stable high-order scheme run Mach 2000 jets and shock diffraction.
Uncertainty spreads by an inverse cascade of decorrelation
Budget equation plus simulations show compressions move uncertainty upward, giving t^{2/3} energy growth.
· “The interscale behaviour of uncertainty in three-dimensional Navier-Stokes turbulence”
Simulations point to finite-time singularities in ideal MHD
A single ratio C decides three fates: no motion at C=1, shear blow-up below it, novel cusps above it.
· “Ideal incompressible axisymmetric MHD: Uncovering finite-time singularities”
Dripping-to-jetting switch is a slow transient
New flow-rate experiments show the jet emerges only after many pinch-offs, and perturbations can advance or delay it.
· “Role of Transient Dynamics in Dripping-Jetting Transition in Newtonian Fluids”
48 simulations collapse spheroid lee flow into three states
At every Reynolds number and angle of attack, the lee recirculation is one of three vortex states that set the forces.
Duct puffs are transient: two lifetime laws split at Re 1450
Same decay mechanism as pipe flow: deterministic slowing below Re 1450, stochastic barrier crossing above.
· “Distinct Lifetime Scaling Laws of Turbulent Puff in Duct Flow”
Twin droplets evaporate up to 1.6x slower than a lone drop
At 50°C the slowdown shrinks to 1.2x — and diffusion alone stops predicting the evaporation rate.
· “Evaporation of sessile drops on a heated superhydrophobic substrate”
350GB synthetic dataset pairs particle images with event streams
Nine flow types with ground truth give fusion-based velocimetry a benchmark to train and compare algorithms.
· “FED-PV: A Large-Scale Synthetic Frame/Event Dataset for Particle-Based Velocimetry”
How a floating particle's own waves propel and bind it
Capillary surfers and spinners show that self-generated waves set both motion and quantized spacing.
· “Propulsion and interaction of wave-propelled interfacial particles”
Ray tracing fixes distorted Raman images of droplets
A horizontal-laser setup reaches the three-phase contact line and maps concentration gradients as the droplet evaporates.
· “Confocal Raman microscopy inside sessile multicomponent droplets”
One Lagrangian predicts Yukawa plasma waves at atomic spacing
Variational hydrodynamics with a step-function pair distribution matches simulated sound speeds and short-wavelength modes.
· “Variational hydrodynamics of the classical Yukawa one-component plasma”
Inclined flow of pressure-thickened liquids always has one solution
Second-gradient terms keep the equations well posed and change the velocity profile near the free surface.
· “Inclined flow of a second-gradient incompressible fluid with pressure-dependent viscosity”
Species-resolved collisions change high-pressure evaporation
Neon's evaporation coefficient switches from nearly constant to pressure-dependent when each collision pair is treated separately.
CFD now reproduces molecular-simulation air chemistry cheaply
Two-temperature MMT rate tables match direct molecular simulation, and differ sharply from the standard Park model.
· “Modified Marrone-Treanor model: parameterization and benchmarking for five-species air”
RANS mixing model now tracks compressible Rayleigh-Taylor flows
Swap the baroclinic density gradient for entropy and counter-gradient heat flux; no new coefficients needed.
· “A compressible Reynolds-averaged mixing model considering turbulent entropy and heat flux”
Coalescing droplets bounce off neighbours and launch them sideways
The bounce turns capillary energy into sideways motion, shedding condensate droplets as small as 100 microns.
· “Non-coalescence and in-plane momentum generation in sessile droplet clusters”
Roe-averaged Jacobians put shock jump conditions into PINN training
A locally Roe-averaged PINN meets Rankine-Hugoniot conditions without knowing shock speeds in advance.
Osmotic membrane flow gets a proven energy-stable model
Water crosses semi-permeable interfaces while total free energy never increases, in theory and in the discrete scheme.
· “Phase-Field Modeling and Energy-Stable Schemes for Osmotic Flow through Semi-Permeable”
Time-history cost drops from O(P^2) to O(P log^2 P)
A causal fast multipole method makes long-time surfactant-laden drop simulations affordable.
· “A fast mesh-free boundary integral method for two-phase flow with soluble surfactant”
Particle spin determines vortex trapping and escape
At moderate inertia, spin-induced lift drives slow vertical oscillations and stable orbits, the paper shows.
Point clouds capture pore-pressure feedback in dense collapse
A two-step coarse-graining strategy cuts grid-size dependence from dilute to dense particle-fluid systems.
Re-radiation from larger nanoparticles heats smaller ones by 23-350 K
A 5 nm particle amid 100 larger ones runs 23 K hotter, and up to 350 K hotter when conduction cooling is weak.
· “Thermal Radiation Exchange between Nanoparticles Heated by Arc Discharge”
Energy ratio in MHD turbulence is the square of scale ratio
When the two eddy sizes match, magnetic and kinetic energies sit in equipartition in astrophysical turbulence.
Two log-law regimes replace Kolmogorov scaling near the wall
Viscous-layer velocity jumps stay non-Gaussian at every scale, even the largest.
· “Structure functions and flatness of streamwise velocity in a turbulent channel flow”
One model covers flotation collisions across all sizes
Merges shear, inertia and gravity into a single formula that beats existing models on DNS data.
Second bubble collapse, not the jet, causes severe erosion
Simulated shock-focusing wall pressures reach 63–92 MPa versus 3.6 MPa for the first-cycle jet.
· “New insights into the cavitation erosion by bubble collapse at moderate stand-off distances”
Internal waves add ocean energy but not drifter spreading
A simulation shows summer's wave-dominated spectrum hides a steeper balanced flow that actually governs pair dispersion.
· “Effects of high-frequency and balanced motions on Lagrangian pair dispersion at the ocean surface”
Two-temperature blood model passes second-law check
In one dimension, all thermodynamic constraints are solved; stresses, heat fluxes and entropy extra-fluxes come out explicitly.
Composite wings that twist while bending lift five times more
A passive fibre layup replaced active twist mechanisms and raised average lift from 1.39 N to 6.9 N in flapping-wing simulations.
· “Lift augmentation by incorporating bend twist coupled composites in flapping wing”
Vapor absorption can force film droplets on a vertical fibre to merge
The model predicts a coalescence window bounded by absorption rates 0.008 and 0.32, once the Marangoni number exceeds 8.28.
· “Dynamics of thin film flows on a vertical fibre with vapor absorption”
Split-and-transfer PINNs capture multiple shock fronts one by one
Starting from the strongest jump, each retrained subdomain resolves the next discontinuity until all fronts are captured.
2.6 is the universal slope of wall turbulence's inner log layer
Beyond that thin layer, the log-plus-linear overlap slope depends on pressure gradient.
· “Reconsiderations about inner layer of wall-bounded flows”
Quadruple precision delays transition in identical vortex DNS runs
Double vs quadruple arithmetic produces different receptivity, growth, and decay in the Taylor-Green vortex.
· “DNS and role of round-off error: Two-Dimensional Taylor-Green vortex problem”
Vortex left by droplet pinch-off decays as 1/time
The transient vortex shears encapsulated bacteria; a neck-geometry model predicts its peak strength.
Simple co-kriging beats neural nets on a 20-run high-fidelity budget
Extreme cost imbalance allows only ~20 high-fidelity runs; Bayesian infill plus POD favors the simpler AR1 model.
Riblets cut drag up to 250 percent in decelerating flow
Deceleration strengthens Kelvin-Helmholtz rollers, letting riblets beat their zero-pressure-gradient drag performance.
· “Attached Decelerating Turbulent Boundary Layers over Riblets”
Rough turbulent flows must dissipate on lower-dimensional sets
Ties the flow's Besov regularity to the dimension of its dissipation set, forcing intermittency for all p>3.
Double-hinged wavemakers can cancel spurious waves with one frequency
Second-order theory shows near-opposite flap motion removes parasitic waves without double-frequency paddle motion.
· “Second-order theory for multi-hinged directional wavemakers”
Review maps ML routes for unstructured physics grids
Graph networks, transformers, and interpolation-based CNNs each fill a niche; open datasets make them testable.
· “Machine learning for modelling unstructured grid data in computational physics: a review”
Droplets win the microswimmer race
When each swimmer picks its fastest stroke, droplets win for all viscosities; efficiency favors vesicles above lambda ~ 1.35.
· “Amoeboid propulsion of active solid bodies, vesicles and droplets: a comparison”
Low-Mach flow solver conserves total energy to roundoff
Relaxing velocity, pressure, density, and internal energy together keeps momentum and energy exact.
Injected linear mode briefly drives near-wall streaks
The optimal wavelet pulse grows transient streaks in turbulent flow, but nonlinear decay starts sooner with stronger forcing.
Bubble and droplet dataset is 100x larger than prior benchmarks
11,000 simulations and a million snapshots show neural operators can learn transient multiphase dynamics.
· “MPFBench: A Large Scale Dataset for SciML of Multi-Phase-Flows: Droplet and Bubble Dynamics”
RL holds airfoil lift at 1.62 where MPC fails
In a near-stall simulation, online RL tunes plasma actuators to 100 or 200 Hz and stabilizes lift; adaptive MPC stops at 1.60.
Time averaging fails when urban wind direction turns
Meter-scale city simulations need ~13% turning-time averaging and 10–50 members for trustworthy wind statistics.
· “Ensembles in Urban Large Eddy Simulations with Changing Wind Direction”
Wall waves shift a transonic shock downstream
DNS shows the shock delay lifts an airfoil's efficiency by 11% and could cut cruise power by about 12%.
· “The aerodynamic performance of a transonic airfoil with spanwise forcing”
Magnetic diffusivity drops below scalar's at finite correlation time
Helical turbulence suppresses magnetic-field transport more than passive-scalar transport by tau_c H^2/18.
Digital twin of a PSA oxygen plant matches experiments
A 2D axisymmetric model with no fitted parameters reproduces pressure and purity, and finds the same optimal cycle timing as the pilot…
· “A simplified digital twin of a pressure swing adsorption plant for air separation”
Three additive terms capture cylindrical Rayleigh-Taylor bubble growth
Model matches DNS for Atwood 0.1-0.9 and Mach 0.1-0.9, and separates convergent from divergent dynamics.
Mild-slope waves solved by a boundary-element kernel
It reproduces shoaling, diffraction, refraction and reflection on seabed slopes up to 1:3.
Magnetic fields turn sound waves into vortices
A new scaling law ties vorticity to field strength squared and acoustic amplitude, a route to early-universe turbulence.
· “Magnetically assisted vorticity production in decaying acoustic turbulence”
One equation unites bulk flows and curved surface dynamics
A pillbox derivation shows the surface balance law follows without extra assumptions.
· “Balance Laws and Transport Theorems for Flows with Singular Interfaces”
SIREN rebuilds pressure fields from noisy flow images
Architecture tuning acts as a bandpass filter, beating grid-based solvers on unstructured data.
Quantum force alters odd moments by 30% in nanofluid simulations
Even moments stay within 1%; thermal fluctuations shield them from quantum interference.
