Velocity fluctuations for bubbly flows at small ReWe experimentally investigate the effect of Reynolds number (Re) on the turbulence induced by the motion of bubbles in a quiescent Newtonian fluid at small Re. The energy spectra, E(k), is…Mithun Ravisankar, Roberto Zenit·Jul 23, 2024SaveLearn
Ultimate regime of Rayleigh-Benard turbulence: Sub-regimes and their scaling relations for Nu vs. Ra and PrWe offer a new model for the heat transfer and the turbulence intensity in strongly driven Rayleigh-Benard turbulence (the so-called ultimate regime), which in contrast to hitherto models is…Olga Shishkina, Detlef Lohse·Jul 23, 2024SaveLearn
Bubble shape oscillations in a turbulent environmentWe investigate bubble deformations in an homogeneous and isotropic turbulent flow by means of direct numerical simulations of a single bubble in turbulence. We examine interface deformations by…Aliénor Rivière, Kamel Abahri, Stéphane Perrard·Jul 23, 2024SaveLearn
Data-driven Koopman operator predictions of turbulent dynamics in models of shear flowsThe Koopman operator enables the analysis of nonlinear dynamical systems through a linear perspective by describing time evolution in the infinite-dimensional space of observables. Here this…C. Ricardo Constante-Amores, Andrew J. Fox, Carlos E. Pérez De Jesús et al.·Jul 23, 2024SaveLearn
A Period-Doubling Route to Chaos in Viscoelastic Kolmogorov FlowPolymer solutions can develop chaotic flows, even at low inertia. This purely elastic turbulence is well studied, but little is known about the transition to chaos. In 2D channel flow and parallel…Jeffrey Nichols, Robert D. Guy, Becca Thomases·Jul 23, 2024SaveLearn
Positive pressure matters in acoustic droplet vaporizationAcoustically vaporizable droplets are phase-change agents that can improve the effectiveness of ultrasound-based therapies. In this study, we demonstrate that the compression part of an acoustic wave…Samuele Fiorini, Anunay Prasanna, Gazendra Shakya et al.·Jul 23, 2024SaveLearn
Measuring the local mechanical properties of a floating elastic sheetPolar regions are covered by sea ice, which can be seen as a thin solid elastic sheet with heterogeneous mechanical properties. The dynamics of deformation of a floating solid sheet are primarly…G. Le Doudic, M. Jafari, J. Barckicke et al.·Jul 23, 2024SaveLearn
Analysis of soot formation in a lab-scale Rich-Quench-Lean combustor using LES with tabulated chemistryA numerical study of the effects of air dilution on soot formation and particle dynamics in a lab-scale rich-quench-lean (RQL) combustor is presented using large-eddy simulations (LES) with tabulated…Leonardo Pachano, Abhijit Kalbhor, Daniel Mira et al.·Jul 23, 2024SaveLearn
Zero-dimensional Analysis of Thermal Choking in Arbitrary Duct with Application to Dual-mode Ramjet CombustorThermal choking in combustor ducts is a matter of great interest to researchers involved in the design and analysis of combustors. In case of scramjet combustors, a thermally choked state is…N Ananthkrishnan, K Sreesankar·Jul 23, 2024SaveLearn
Feigenbaum universality in subcritical Taylor-Couette flowFeigenbaum universality is shown to occur in subcritical shear flows. Our testing ground is the counter-rotation regime of the Taylor-Couette flow, where numerical calculations are performed within a…Baoying Wang, Roger Ayats, Kengo Deguchi et al.·Jul 22, 2024SaveLearn
Near-inertial echoes of ageostrophic instability in submesoscale filamentsOcean submesoscales, flows with characteristic size around 10 m - 10 km, are transitional between the larger, rotationally-constrained mesoscale and three-dimensional turbulence. In this paper we…Erin Atkinson, James McWilliams, Nicolas Grisouard·Jul 22, 2024SaveLearn
Time-resolving PIV measurements and modal analysis of turbulent flow in a bench-scale hydrodynamic separatorEffective stormwater treatment infrastructures are crucial for mitigating the adverse effects of runoff on urban water quality. However, designing cost-effective treatment systems can be challenging…Haochen Li·Jul 22, 2024SaveLearn
WaterLily.jl: A differentiable and backend-agnostic Julia solver for incompressible viscous flow around dynamic bodiesIntegrating computational fluid dynamics (CFD) solvers into optimization and machine-learning frameworks is hampered by the rigidity of classic computational languages and the slow performance of…Gabriel D. Weymouth, Bernat Font·Jul 22, 2024SaveLearn
Single-particle diffraction with a hydrodynamic pilot-wave modelA macroscopic hydrodynamic system that couples a particle and a wave has recently renewed interest in the question as to what extent a classical system may reproduce quantum phenomena. Here we…Giuseppe Pucci, Antoine Bellaigue, Alessia Cirimele et al.·Jul 22, 2024SaveLearn
A universal relation between intermittency and dissipation within and beyond homogeneous isotropic turbulenceFundamental quantities of turbulent flows, such as the dissipation parameter C and the intermittency parameter μ, are examined in relation to each other for a broad…F. Schmitt, A. Fuchs, J. Peinke et al.·Jul 22, 2024SaveLearn
Inferring turbulent velocity and temperature fields and their statistics from Lagrangian velocity measurements using physics-informed Kolmogorov-Arnold NetworksWe propose the Artificial Intelligence Velocimetry-Thermometry (AIVT) method to infer hidden temperature fields from experimental turbulent velocity data. This physics-informed machine learning…Juan Diego Toscano, Theo Käufer, Zhibo Wang et al.·Jul 22, 2024SaveLearn
High-flexibility reconstruction of small-scale motions in wall turbulence using a generalized zero-shot learningThis study proposes a novel super-resolution (or SR) framework for generating high-resolution turbulent boundary layer (TBL) flow from low-resolution inputs. The framework combines a super-resolution…Haokai Wu, Kai Zhang, Dai Zhou et al.·Jul 22, 2024SaveLearn
An implicit adaptive unified gas-kinetic scheme for steady-state solutions of non-equilibrium flowsNonequilibrium flows have been frequently encountered in various aerospace engineering applications. To understand nonequilibrium physics, multiscale effects, and the dynamics in these applications,…Wenpei Long, Yufeng Wei, Kun Xu·Jul 22, 2024SaveLearn
Numerical simulations of attachment-line boundary layer in hypersonic flow, Part II: the features of three-dimensional turbulent boundary layerIn this study,we investigate the characteristics of three-dimensional turbulent boundary layers influenced by transverse flow and pressure gradients. Our findings reveal that even without assuming an…Youcheng Xi, Bowen Yan, Guangwen Yang et al.·Jul 22, 2024SaveLearn
Numerical simulations of attachment-line boundary layer in hypersonic flow, Part I: roughness-induced subcritical transitionsThe attachment-line boundary layer is critical in hypersonic flows because of its significant impact on heat transfer and aerodynamic performance. In this study, high-fidelity numerical simulations…Youcheng Xi, Bowen Yan, Guangwen Yang et al.·Jul 22, 2024SaveLearn
Experimental study on the relationship between extensional and shear rheology of low-viscosity power-law fluidsThis paper investigates the relationship between extensional and shear viscosity of low-viscosity power-law fluids. We show the first experimental evidence of the conditions satisfying the same power…Yuzuki Matsumoto, Misa Kawaguchi, Yoshiyuki Tagawa·Jul 22, 2024SaveLearn
Error propagation of direct pressure gradient integration and a Helmholtz-Hodge decomposition based pressure field reconstruction method for image velocimetryRecovering pressure fields from image velocimetry measurements has two general strategies: i) directly integrating the pressure gradients from the momentum equation and ii) solving or enforcing the…Lanyu Li, Jeffrey McClure, Grady B. Wright et al.·Jul 22, 2024SaveLearn
Schur Forms and Normal-Nilpotent DecompositionsReal and complex Schur forms have been receiving increasing attention from the fluid mechanics community recently, especially related to vortices and turbulence. Several decompositions of the…Zhen LI·Jul 21, 2024SaveLearn
Turbulent convection in rotating slender cellsTurbulent convection in the interiors of the Sun and the Earth occurs at high Rayleigh numbers Ra, low Prandtl numbers Pr, and different levels of rotation rates. To understand the combined…Ambrish Pandey, Katepalli R. Sreenivasan·Jul 21, 2024SaveLearn
PyDDC: An Eulerian-Lagrangian simulator for density driven convection of CO2--brine systems in saturated porous mediaPyDDC is a particle tracking reservoir simulator capable of solving non-linear density driven convection of single phase carbon-dioxide (CO2)--brine fluid mixture in saturated porous…Sayan Sen, Scott K. Hansen·Jul 21, 2024SaveLearn