Flapping Wings Amplify Pitch Stability: Insights from a Robotic BirdUsing a flapping robot in a wind tunnel, we show that flapping faster amplifies existing longitudinal static stability (focusing on the pitch stiffness) and can even make an unstable flier stable. We…Rónán Gissler, Kenneth S. Breuer·Apr 25, 2026SaveLearn
Revisit viscous shock tube at low Reynolds numberThe viscous shock tube is a canonical test case for assessing Navier-Stokes (NS) solvers in the continuum-flow regime, widely used to validate numerical accuracy and probe flow physics. It features a…Yue Zhang, Kun Xu·Apr 25, 2026SaveLearn
Bayesian neural network correction of RANS turbulence models with uncertainty quantification in separated flowsData-driven correction of turbulence models offers a promising route for improving Reynolds-averaged Navier-Stokes (RANS) predictions, but quantifying uncertainty in such corrections and ensuring…Tyler Buchanan, Ali Eidi, Richard P. Dwight·Apr 25, 2026SaveLearn
Minimal seeds in the Stokes boundary layerMinimal seeds, the smallest amplitude perturbations that trigger transition to turbulence, are presented in the Stokes boundary layer, the oscillating flow of a viscous fluid above a flat plate. The…Tom Eaves·Apr 25, 2026SaveLearn
How modeling assumptions shape predictions of convective mixing of carbon dioxideWe investigate how models of fluid properties and boundary conditions influence predictions of convective mixing in confined porous media, with relevance to subsurface carbon dioxide storage. Using…Marco De Paoli, Sergio Pirozzoli·Apr 25, 2026SaveLearn
Lift and leading-edge suction parameter of separated flows over an NACA0012 at high angles of attackThe flow condition at the leading edge governs the dynamics of the leading-edge vortex, which is crucial for understanding the separated flow over an airfoil at high angle of attack. Furthermore,…Ching Chang, You-Peng Shih, Tang-An Li·Apr 25, 2026SaveLearn
Distinct transverse-response signatures of retained-spin, eliminated-spin, and polynomial Burnett-type surrogate closuresHigh-curvature observables in incompressible flows, including k4-weighted spectra, can arise from explicit internal rotation, elimination of a fast spin variable, or polynomial higher-gradient…Satori Tsuzuki·Apr 25, 2026SaveLearn
Impact of the formation angle on the drag of bio-inspired -formationsBio-inspired flight formation is a well known technique for energy saving among groups of fixed-wing aircraft, and as of recently, for groups of quad-rotors. Here, we study the effect of…Prasoon Suchandra, Shabnam Raayai-Ardakani·Apr 24, 2026SaveLearn
Renormalized flow theory of wave turbulence: Kolmogorov-Zakharov spectra as emergent asymptotic statesWe develop a continuous Wilsonian renormalized-flow theory of weak wave turbulence directly in spectral frequency space, for finite cascades in experimentally driven Newtonian fluids. The central…F. Monroy, J. A. Santiago·Apr 24, 2026SaveLearn
On Fin Based Propulsion and Maneuvering for Uncrewed Underwater VehiclesBio-inspired propulsion using oscillating fins has gained attention for its potential to achieve high thrust, efficiency, and maneuverability. Many aquatic organisms generate propulsion through…Parker Thomas Grobe·Apr 24, 2026SaveLearn
A Surfactant Prediction Model for Rising BubblesBubbles released from a needle show shape deformations that depend on the surfactant concentration of the surrounding liquid. We develop a model that predicts the surfactant concentration based on…Lim Chi Tung James, Ivo R. Peters, Swathi Krishna·Apr 24, 2026SaveLearn
Conservative and skew-symmetric forms of the incompressible Navier-Stokes equations in sigma-coordinatesThis study derives conservative and skew-symmetric formulations of the incompressible flow equations in a terrain-following sigma-coordinate system that preserve key structural properties of the…Jaeyoung Jung, Marco Giometto·Apr 23, 2026SaveLearn
Lagrangian Proper Orthogonal DecompositionWe introduce a modal representation for Lagrangian trajectories in turbulence, termed Lagrangian Proper Orthogonal Decomposition (LPOD). An ensemble of particle trajectories is used to construct…Ron Shnapp, Stefano Brizzolara·Apr 23, 2026SaveLearn
Drag penalty during relaminarization and Kelvin-Helmholtz-promoted retransition in an accelerating turbulent boundary layer over initially drag-reducing ribletsDirect numerical simulations of an accelerating turbulent boundary layer (TBL) over a smooth wall and a wall fully covered with streamwise-aligned riblets are performed to investigate drag modulation…Benjamin Savino, Wen Wu·Apr 23, 2026SaveLearn
Meshless h-adaptive Solution for non-Newtonian Natural Convection in a Differentially Heated CavityOne of the main challenges in numerically solving partial differential equations is finding a discretisation for the computational domain that balances the accurate representation of the underlying…Miha Rot, Gregor Kosec·Apr 23, 2026SaveLearn
Exact formulas for arbitrary order velocity-gradient moments in isotropic turbulenceStatistical moments of velocity gradients provide fundamental information on the small-scale properties of turbulence. In this work, we propose a systematic method to derive exact expressions for…Tong Wu, Chensheng Luo, Le Fang et al.·Apr 23, 2026SaveLearn
Unified Hydrodynamic Analogue of Aharonov-Bohm and Lense-Thirring EffectsWe show that surface waves in a draining-bathtub vortex provide a hydrodynamic realization of both Aharonov-Bohm phase shifts and Lense-Thirring frame dragging within a single system. A static time…Aditya Singh, Joseph Samuel, Chien-chia Liu et al.·Apr 23, 2026SaveLearn
On the role of inertia and self-sustaining mechanism in two-dimensional elasto-inertial turbulenceElasto-inertial turbulence (EIT) is primarily driven by polymer elasticity, yet the modulating role of fluid inertia is non-negligible and remains largely unexplored. To investigate the effect of…Haotian Cheng, Hongna Zhang, Wenhua Zhang et al.·Apr 23, 2026SaveLearn
Uncertainty-Aware Spatiotemporal Super-Resolution Data Assimilation with Diffusion ModelsData assimilation (DA) improves prediction of chaotic systems by combining model forecasts with sparse, noisy observations. Many DA methods are inherently probabilistic, but accurate probabilistic DA…Aditya Sai Pranith Ayapilla, Kazuya Miyashita, Yuki Yasuda et al.·Apr 23, 2026SaveLearn
Turbulent mixing of a hydrogen jet in crossflow: direct numerical simulation and model assessmentA numerical study for a hydrogen (H2) jet in an air crossflow (JICF) was performed using direct numerical simulation (DNS), large eddy simulation (LES), and Reynolds-averaged Navier-Stokes (RANS)…Yiqing Wang, Chao Xu, Riccardo Scarcelli et al.·Apr 23, 2026SaveLearn
Particle-resolved simulations of settling particles: A methodology for long time-integration intervalsWe present a methodology for simulating dilute suspensions of particles settling under gravity, with the main purpose of overcoming limitations of triply periodic configurations, mainly the strong…M. Moriche, M. García-Villalba, M. Uhlmann·Apr 22, 2026SaveLearn
Hydrodynamic loads and vortex evolution from a bio-inspired pectoral fin near a solid bodyA fin-body configuration is tested in a water tunnel to study the hydrodynamic loads and vortex evolution under dynamic fin-flapping motions, which is an idealized approximation of the pectoral fins…Xiaowei He, Kenneth Breuer·Apr 22, 2026SaveLearn
Surfactant effect on collective bubble bursting and aerosol emissionBubbles entrained by breaking waves rise to the ocean surface where they cluster and burst, emitting sea spray aerosols into the atmosphere. Bubble bursting thereby links seawater biogeochemistry and…Megan Mazzatenta, Samuel M. Koblensky, Luc Deike·Apr 22, 2026SaveLearn
RG-Based Local Hopf Reduction and Slow-Manifold Reconstruction for Nonlinear Aeroelastic SystemsSelf-excited limit-cycle oscillations (LCOs) from Hopf bifurcations are a key feature of nonlinear aeroelasticity and depend sensitively on structural and aerodynamic parameters. Classical…Gelin Chen, Chen Song, Chao Yang·Apr 22, 2026SaveLearn
Subharmonic instability of large-scale wavy structures in two-dimensional channelsA particular interest on two-dimensional turbulence is the inverse energy cascade from small to large sales, which leads to an energy condensation accompanied by the formation of large-scale vortical…An-Xiao Han, Peng-Yu Duan, Ming-Ze Ma et al.·Apr 22, 2026SaveLearn