New papers on Fluids, plasma & complex systems
135 new papers on fluids, plasma & complex systems in the last 7 days, within Physics. These are the 50 Pipette rates most worth reading, with the main result in the authors' own words.
The best of the week
Creases gate and steer droplets via elastocapillary repulsion
Creases, localized indentations arising from elastic instabilities at strained soft interfaces, autonomously gate and steer droplets via long-range elastocapillary repulsion.
Peer-reviewed journalReal-world useEquivariant Neural Prediction of the Stokes Resistance Tensors for Arbitrary Microparticle Shapes
We present an SO(3)-equivariant neural network that predicts the full symmetric positive-definite A and C blocks from a particle's spherical-harmonic surface representation, equivariant by construction to floating-point precision.
PreprintReal-world useDisorder-promoted stability
Our framework reveals disorder not as a liability but as a general resource for stabilizing complex systems.
Preprint with a published versionBold claims, read criticallyMarangoni-overriding flow in laser-irradiated particle-capped droplets
Here, we report an overriding of this flow in laser-irradiated droplets capped with a jammed particle layer, where particles migrate along the interface toward the apex of reduced surface tension, against the thermal gradient, via a propagating unjamming front.
Peer-reviewed journalBold claims, read criticallyMicrobubble emission boiling reinterpreted: Condensation-driven oscillations enable heat transfer beyond the critical heat flux
Under sufficient subcooling, rapid condensation intercepts vapor coalescence, redirecting the postinstability evolution toward high-frequency, collapse-driven convection that continuously renews the surface, a state we identify as condensation-driven oscillatory boiling (COB).
Peer-reviewed journalBold claims, read criticallyMeasurement of Nanoscale Surface Disturbances on Liquid Jets Using the Mie Scattering Method
Here we introduce a Mie-scattering-based measurement technique to characterize nanoscale surface disturbances on liquid jets.
PreprintTunable parametric vibrations in fluid ferroelectric fibres
These results establish ferroelectric-nematic fibres as electrically programmable fluid resonators coupling polar order and interfacial flow with nonlinear vibration.
PreprintMechanism of Ionization Avalanche in Tokamak Microwave Gas Breakdown
The Monte Carlo simulation unveils the key role of parallel Brownian motion in the ionization avalanche mechanism.
PreprintBold claims, read criticallyClaims a big stepReal-world useMultiple self-similar crossovers in a hydrodynamic interface
These findings demonstrate that self-similar dynamics can undergo multiple successive crossovers among distinct scaling regimes rather than directly approaching a single asymptotic self-similar state.
PreprintFluid Flow as Transport of Probability: Entropy, Compressibility, and Irreversibility
I derive the temporal evolution of Shannon entropy under general flow conditions, establishing how entropy generation depends on macroscopic compressibility and microscopic diffusion.
Preprint with a published versionMechanism-Separated Closed-Form Transition Modeling via Field Inversion and Symbolic Regression
This study develops a mechanism-separated transition model using field inversion and symbolic regression.
PreprintReal-world useBlade secondary vortex interaction noise in hovering rotors
BSVI is thus identified as a distinct and previously uncharacterized source of aperiodic tonal noise in hovering rotors, with direct implications for the acoustic design of small- to medium-scale rotorcraft and electric vertical take-off and landing propulsors.
PreprintReal-world useCascade-driven fragmentation-aggregation transitions in decaying turbulence
These results replace the conventional instantaneous Hinze criterion with a non-equilibrium, cascade-controlled framework for turbulent fragmentation and aggregation.
PreprintScalar Dissipation Criticality in Compressible Magnetized Turbulence
If the density-weighted third-order velocity and scalar increments scale as and , respectively, we prove that anomalous scalar dissipation is impossible when .
PreprintCFD-Machine Learning Driven Pod Optimization and Staged Pressure-Area Management for Supersonic Evacuated Tube Transport
The results demonstrate the potential of combined pod-shape optimization and staged pressure-area management for reducing aerodynamic resistance in supersonic ETT systems.
PreprintReal-world useVEQDB: A Compact and Reconstructible Multi-Device Tokamak Equilibrium Database
Here, we present VEQDB, an open, compact, and reconstructible fixed-boundary equilibrium database built on continuous MXH--Chebyshev geometry and independent physical-profile roots.
PreprintAI-Accelerated Gyrokinetic Predictions of Turbulent Transport for Stellarator Design Optimization and Experimental Planning
In this paper, we demonstrate the use of the AI-based turbulence surrogate in the optimization of stellarator magnetic equilibrium and to speed up stellarator transport solvers.
PreprintDiscovery of a dispersion model at high Peclet numbers
We develop a novel explicit-closure one-dimensional (1-D) effective dispersion model for this high- regime by introducing two closure coefficients, and , whose functional structures are identified using low-frequency transfer-function matching and a modified Kolmogorov-Arnold network (KAN).
PreprintReal-world useInteraction renormalization and the plasma staircase
It is shown based on the Schr\"odinger-Newton equation with renormalized interaction constant that the plasma staircase is robust and stable as soon as the nonadiabaticity parameter, {\delta}, goes above a certain critical value, and is unstable otherwise.
PreprintLearning Stiffness Dependent Fluid Structure Dynamics from Coarse Flow Representations
The proposed framework provides an accurate and differentiable surrogate for stiffness-dependent FSI dynamics, enabling efficient parameter studies and future stiffness optimization for flow-energy-harvesting applications.
PreprintReal-world useDiff-NekRS: A Scalable Differentiable Framework for Multi-Timestep Solver-in-the-Loop Training
We introduce Diff-NekRS, a scalable differentiable framework that embeds neural corrections directly in the GPU-accelerated NekRS incompressible-flow solver.
PreprintWarp-Geo: Differentiable Geometry Representation for Dynamic-Boundary Simulation and Shape Optimization
We present Warp-Geo, a differentiable GPU-accelerated framework for reconstructing signed distance fields and evaluating surface normals from point clouds of complex 3D geometries.
PreprintAnalytic toroidal 3D MHD equilibria and steady Euler flows with invariant surfaces
Families of explicit analytic solutions of the magnetohydrodynamic equilibrium equations are presented, equivalent to steady incompressible Euler flow.
PreprintWind farm global blockage as an adverse pressure gradient problem: turbulence amplification and spectral modification in the induction region of a model wind farm
The results establish a quantitative link between wind farm global blockage and APG boundary layer physics.
PreprintReal-world useAn Exactly Solvable Ekman Layer with a Fractional-Order Stress Closure
The surface deflection then depends on the closure order alone and is smaller than forty-five degrees throughout, whereas the depth-integrated transport stays exactly normal to the wind, because that constraint follows from the momentum balance and not from the closure.
PreprintA Physics-Driven Framework for Parametric Periodic-Flow Modeling and Finite-Amplitude Aeroelastic Response Analysis
This study proposes a purely physics-driven framework for solving parametric periodic flows and finite-amplitude aeroelastic responses.
PreprintThe cubic discriminant as an organizing principle for Duffing dynamics
These results reveal the massless Duffing equation as the organizing center of the full finite-mass dynamics and establish a direct link between the algebraic structure of the degenerate problem and the global bifurcation structure of the oscillator.
Preprint with a published versionStabilization of Yih's Viscosity Jump Interface in a Channel
We stabilize this interface at any rate below the limit set by the streamwise mean flow, by static feedback of the two velocity components of that wall, through a Fredholm backstepping transformation acting jointly on the two layers.
PreprintGeneral model for shear stress and surface pressure distributions for flow over spheres
A general physics-based model for the distribution of shear stress and surface pressure is developed for laminar flow over spheres.
PreprintOptimization of fluid mixing by reinforcement learning using limit cycles of a dynamical system
The proposed method has two main features: (i) it does not require detailed measurements of the flow state, and (ii) by effectively exploiting a stable limit cycle of a two-dimensional dynamical system (the Li'enard system), it can stably perform optimization without imposing explicit constraints on the control parameters.
PreprintChannel confinement mollifies roll wave instabilities
Via a section-averaged stability analysis conducted independently of the rheology of the flowing material, convex open channels are found to be stabilising, relative to unconfined flows.
PreprintThe disordered logistic map
Using a combination of dynamic mean-field theory, random matrix theory and numerical simulations, we show that even the smallest amount of disorder can remove the period-doubling cascade in the conventional logistic map.
PreprintReal-Time Plasma State Prediction via FPGA-Accelerated Quantized Recurrent Probabilistic Neural Networks
We report a design that fits comfortably within all four resource budgets (DSP, LUT, FF, BRAM) at deterministic sub-10~s single-timestep latency, meeting the requirements for real-time inference inside a model-predictive-control-style plasma control loop.
PreprintReal-world useAn experimental and numerical study of the circular hydraulic jump
We find that, on the scale of a kitchen sink, and for water at high Reynolds number and low Bond number, at the jump the Weber number is of order unity while the Froude number is large, implying that the jump is controlled by surface tension.
PreprintShear induced cavitation in radially expanding, chemically equilibrating QGP
We present the first study of shear viscosity induced cavitation incorporating transverse expansion alongside chemical non-equilibrium dynamics in the Quark-Gluon Plasma (QGP).
PreprintMagneto-coalescence phenomena in colliding ferrofluid droplets
With the field applied, a bulk-dissipation energy balance predicts , where combines the magnetic-driving, and inertial-capillary-viscous terms, but the observations instead follow a markedly weaker , a deficit traced to enhanced dissipation from the magnetoviscous effects, and manifested via an effective Ohnesorge number.
PreprintReal-world useQuantum many-body framework for passive-scalar turbulence
We develop a non-Hermitian bosonic framework that unifies equal-time anomalous statistics and their temporal propagation within a common operator representation.
PreprintUnderwater bubble transport on superhydrophobic cylindrical rod
Both experiments and numerical simulations consistently reproduce this wake-mediated acceleration, which shows that bubble transport is governed by both the force balance on individual bubbles and the hydrodynamic interactions between adjacent bubbles.
PreprintExact explicit wave-angle solutions for equilibrium oblique detonations
In this work, we solve this inverse problem for the classical model and derive explicit formulae for the wave angle.
PreprintWhy MHD turbulence forms sheets: energy conversion and cascade geometry
Here, by applying a theoretical framework to data from numerical simulations, we demonstrate that current-sheet formation is a direct consequence of energy conversion between kinetic and magnetic fields.
PreprintA thermodynamically consistent and conservative phase-field model for surfactant contact line dynamics with solid adsorption
We develop a thermodynamically consistent and conservative Allen-Cahn-Navier-Stokes model for surfactant-laden contact line dynamics with solid adsorption.
PreprintMultidimensional dynamical centrality from Green functions in complex networks
From the same response function, we extract three complementary indicators---Influence, Efficiency, and Distortion---that quantify cumulative response strength, temporal rate of response, and spectral concentration, respectively, together with a contribution matrix that resolves these quantities into source--target pathways.
PreprintMachine Learning Accelerated Plasma Simulation through Physics Guided Time Jumps
We present a machine-learning-accelerated plasma simulation scheme that combines learned time jumps with ordinary physics evolution.
PreprintBubble detachment from circular cavities and flat surfaces
We determine the maximum stable volume of bubbles attached to flat surfaces as a function of contact radius, contact angle, and capillary length.
Preprint with a published versionModelling friction and heat transfer in turbulent forced convection over porous lattices
We show that theories developed for rough- wall turbulence can be extended to porous surfaces by replacing the roughness height with the inverse of the streamwise Forchheimer coefficient.
PreprintApplications of a moving surface drag model: From Stokes waves to offshore wind farms
Overall, the results demonstrate that the MOSD model provides a tractable framework for incorporating resolved wave effects in wind-wave and offshore wind-farm simulations.
PreprintReal-world useMechanisms of transonic buffet over supercritical airfoils revealed by direct numerical simulations
Together, these results are consistent with a unified picture of buffet, where an aeroacoustic feedback mechanism provides the physical pathways through which perturbations can sustain the global dynamics.
PreprintAttractors and basins generated by repeated sums of prime factors of natural numbers
By systematically exploring the parameter space for , we uncover a rich bifurcation structure characterized by the emergence, disappearance, and reorganization of attractor cycles as the shift parameter varies.
PreprintPeriodic Neural Mapping for Unsteady Rotor-Blade Pressure and Aeroelastic Load Prediction
This work introduces periodic Fourier Neural Mapping (p-FNM), a neural-operator framework for predicting unsteady pressure distributions on turbine rotor blades simulated using the chorochronic numerical hypothesis.
PreprintReal-world useThe Positive Defect Problem: Target and Admissibility Criteria for a Programmatic Search for Unforced Navier-Stokes Blowup
The paper proves the target equivalent to a floor on the energy flux through the Littlewood-Paley shells, the Fourier-side form of the coarse-grained flux of the Onsager theory of turbulence, averaged over the window; states necessary conditions on a candidate: a singular time of Type II in velocity, energy concentrating on a set of zero length, a pressure outside L^2, a velocity outside the Onsager-critical class L^3_t B^{1/3}_{3,c_0}, an obstruction to collapse onto a fixed steady Euler profile; and states what cannot certify one: no finite computation witnesses a Galerkin-uniform ceiling, and selection and forcing return the question to a positive defect.
Preprint