995 papers
Fluid dynamics explores how liquids and gases move, shaping everything from weather patterns to the flow of blood through our veins. This field bridges the gap between abstract mathematical equations and the tangible forces that drive our physical world, offering insights into turbulence, aerodynamics, and fluid behavior in complex environments.
On Gist.Science, we process every new preprint in this category directly from arXiv to make cutting-edge research accessible to everyone. Each paper is transformed into a clear, plain-language overview alongside a detailed technical summary, ensuring both students and experts can grasp the latest findings without getting lost in dense jargon.
Below, you will find the most recent studies in fluid dynamics, curated and explained for a broader audience.
This paper presents a nonlinear three-dimensional theory for a surfactant-laden leaky dielectric drop in a DC electric field, revealing how the interplay between charge convection and surfactant diffusion influences the drop's shape, the critical threshold for Quincke rotation, and the potential disappearance of hysteresis in angular velocity.
This paper theoretically derives and experimentally validates how the contact angle of a submerged bubble influences impulsive jet speed, revealing a non-monotonic relationship with depth that yields an optimal bubble curvature only when the tube is submerged.
This study presents the first direct numerical simulation of distributed roughness on a Mach 6 blunt cylinder, revealing that the roughness arrangement dictates the transition mechanism by either promoting sinuous streak modes or 2D T-S waves, with the latter uniquely sustained by an internal acoustic feedback loop that eliminates the need for external forcing.
This study utilizes surface pressure measurements to characterize the spanwise dynamics of stall cells on a thick airfoil at high Reynolds numbers, revealing that these structures exhibit a coherent, linearly expanding motion dominated by large-scale sweep and smaller-scale oscillations, which allows for the tracking of global flow behavior through local measurements.
This study demonstrates that MHz-level surface acoustic waves can continuously extract oil from oil-in-water emulsions on solid surfaces via the acoustowetting phenomenon, where low-surface-tension oil phases migrate as fingers opposite the wave direction while high-surface-tension water remains stationary, offering a promising method for heterogeneous oil separation.
This paper theoretically and numerically investigates the stability of time-periodic shear flows generated by oscillating density interfaces, demonstrating that instability occurs when a nondimensional parameter exceeds a critical threshold, leading to exponential growth of perturbations and the formation of Kelvin-Helmholtz billows, with implications for diapycnal mixing in real-world water bodies like Lake Geneva and Chesapeake Bay.
This paper investigates the capillary-driven retraction of a highly viscous liquid sheet in the limit of large Ohnesorge and aspect ratios, deriving a reduced heat-equation model with a single dimensionless parameter that reveals distinct retraction regimes—including early-time growth, a Taylor-Culick intermediate phase for long sheets, and late-time decay—through asymptotic matching of thin-film and tip-flow dynamics.
This paper presents a novel geometric reinitialization method for the Conservative Level-Set solver in capillary flow simulations, demonstrating through comparative 3D case studies that it achieves high-fidelity results with greater robustness and fewer parameters than traditional PDE-based approaches, while outperforming simple projection-based methods.
This paper proposes a novel inverse-time PDE framework for Navier-Stokes vortex stretching that integrates score-based diffusion models to learn Lagrangian particle trajectories, revealing that information about initial positions dissipates rapidly in compressive directions while being preserved in stretching directions.
This paper presents a new systematic derivation of the energy equation for the Shallow Water Linearized Moment Equations (SWLME) by extending the standard Shallow Water Equations approach to include skew-symmetric formulations, thereby facilitating the extension to other SWME variants and improving their numerical solutions.