Linear and nonlinear instabilities in highly shear thinning fluid flow through a pipeShear-thinning fluids flowing through pipes are crucial in many practical applications, yet many unresolved problems remain regarding their turbulent transition. Using highly robust numerical tools…Xuerao He, Kengo Deguchi, Runjie Song et al.·Dec 13, 2024SaveLearn
Universality of extreme events in turbulent flowsThe universality of small scales, a cornerstone of turbulence, has been nominally confirmed for low-order mean-field statistics, such as the energy spectrum. However, small scales exhibit strong…Dhawal Buaria, Alain Pumir·Dec 13, 2024SaveLearn
Unified gas-kinetic scheme for reactive flow with multi-scale transport and chemical non-equilibriumReactive flows for rarefied gas mixtures involve a multi-scale transport characterized by particle collisions and free streaming, and non-equilibrium physics containing multi-species interactions,…Yufeng Wei, Junzhe Cao, Kun Xu·Dec 13, 2024SaveLearn
Identification of structures driving trailing-edge noise. Part II -- Numerical investigationThe aim of the present work is to investigate the mechanisms of broadband trailing-edge noise generation to improve prediction tools and control strategies. We focus on a NACA 0012 airfoil at 3…Zhenyang Yuan, Simon Demange, Kilian Oberleithner et al.·Dec 12, 2024SaveLearn
Identification of structures driving trailing-edge noise. Part I -- Experimental investigationTrailing-edge (TE) noise is the main contributor to the acoustic signature of flows over airfoils. It originates from the interaction of turbulent structures in the airfoil boundary layer with the…Simon Demange, Zhenyang Yuan, Simon Jekosch et al.·Dec 12, 2024SaveLearn
Synchrotron X-Ray Multi-Projection Imaging (XMPI) for High-Resolution 4D Characterization of Multiphase FlowsMultiphase flows where particles, bubbles, or droplets are suspended in a fluid govern critical processes in biology, medicine, materials processing, and geophysics. However, observing their…Tomas Rosén, Zisheng Yao, Jonas Tejbo et al.·Dec 12, 2024SaveLearn
Thermal effects on the lifetime of evaporating drops on fibersWe present an experimental study on the evaporation of drops on fibers. More specifically, we focus on the droplet lifetime both in quiescent air and in an air flow of constant velocity. We propose a…Marie Corpart, Frédéric Restagno, François Boulogne·Dec 12, 2024SaveLearn
Explicit formulas for forced convection in a shrouded longitudinal-fin heat sink with clearanceWe consider laminar forced convection in a shrouded longitudinal-fin heat sink (LFHS) with tip clearance, as described by the pioneering study of Sparrow, Baliga and Patankar [1978, J. Heat Trans,…Toby L. Kirk, Marc Hodes·Dec 12, 2024SaveLearn
Supersonic Shear and Wall-Bounded Flows With Body-Fitted Meshes Using the Semi-Lagrangian Lattice Boltzmann Method: Boundary Schemes and ApplicationsLattice Boltzmann method (LBM) simulations of incompressible flows are nowadays common and well-established. However, for compressible turbulent flows with strong variable density and intrinsic…Philipp Spelten, Dominik Wilde, Mario Christopher Bedrunka et al.·Dec 12, 2024SaveLearn
Topological Entropy of Two Dimensional TurbulenceDeformation of material lines drives transport and dissipation in many industrial and natural flows. Here we report an exact Eulerian formula for the stretching rate of a material line, also known as…Amal Manoharan, Sai Subramanian, Ashwin Joy·Dec 12, 2024SaveLearn
Predicting Performance of Microfluidic-Based Alginate Microfibers with Feature-Supplemented Deep Neural NetworksSelection of solution concentrations and flow rates for the fabrication of microfibers using a microfluidic device is a largely empirical endeavor of trial-and-error, largely due to the difficulty of…Nicholus R. Clinkinbeard, Justin Sehlin, Meharpal Singh Bhatti et al.·Dec 11, 2024SaveLearn
Quantifying Model Uncertainty of Neural Network-based Turbulence ClosuresWith increasing computational demand, Neural-Network (NN) based models are being developed as pre-trained surrogates for different thermohydraulics phenomena. An area where this approach has shown…Cody Grogan, Som Dutta, Mauricio Tano et al.·Dec 11, 2024SaveLearn
Extreme low submergence in deep-canopy flowsThis letter investigates converged statistics in three-dimensional deep-canopy-dominated flows under two low relative submergence conditions: h/k=1.5 and h/k=1.2. Using a multi-plane telecentric…Loïc Chagot, Frédéric Y. Moulin, Olivier Eiff·Dec 11, 2024SaveLearn
Critical nanoparticle formation in iron combustion: single particle experiments with in-situ multi-parameter diagnostics aided by multi-scale simulationsThe formation of iron oxide nanoparticles (NPs) presents challenges such as efficiency losses and fine dust emissions in practical iron combustion systems, highlighting the need for deeper…Tao Li, Bich-Diep Nguyen, Yawei Gao et al.·Dec 11, 2024SaveLearn
Pinning induced motion and internal flow in neighbouring evaporating multi-component dropsThe evaporation of multi-component sessile droplets is key in many physicochemical applications such as inkjet printing, spray cooling, and micro-fabrication. Past fundamental research has primarily…Pim J. Dekker, Marjolein N. van der Linden, Detlef Lohse·Dec 11, 2024SaveLearn
Nascent water waves induced by the impulsive motion of a solid wallIn the present study, we investigated the generation phase of laboratory-scale water waves induced by the impulsive motion of a rigid piston, whose maximum velocity U and total stroke L are…Wladimir Sarlin, Zhaodong Niu, Alban Sauret et al.·Dec 11, 2024SaveLearn
Deep Operator Learning for High-Fidelity Fluid Flow Field Reconstruction from Sparse Sensor MeasurementsReconstructing high-fidelity fluid flow fields from sparse sensor measurements is vital for many science and engineering applications but remains challenging because of dimensional disparities…Hiep Vo Dang, Phong C. H. Nguyen·Dec 11, 2024SaveLearn
Computational And Experimental Study of Spanwise Synthetic Jet Flow ControlThis study investigates the reattachment of flow on a stalled NACA 0025 airfoil with an array of circular synthetic jet actuators. Experimental flow visualizations are used to assess the spanwise…Howard Ho, Adnan Machado, Pierre Sullivan·Dec 10, 2024SaveLearn
On the shape of ice stalagmitesThe growth of ice stalagmites obtained by the solidification of impacting droplets on a cooled substrate (-50C to -140C) is investigated experimentally. It is shown that for any…Daniel Papa, Christophe Josserand, Caroline Cohen·Dec 10, 2024SaveLearn
Optimizing pulsed blowing parameters for active separation control in a one-sided diffuser using reinforcement learningReinforcement learning is employed to optimize the periodic forcing signal of a pulsed blowing system that controls flow separation in a fully-turbulent Reθ = 1000 diffuser flow. Based on the…Alexandra Müller, Tobias Schesny, Ben Steinfurth et al.·Dec 10, 2024SaveLearn
Automatic extraction of wall streamlines from oil-flow visualizations using a convolutional neural networkOil-flow visualizations represent a simple means to reveal time-averaged wall streamline patterns. Yet, the evaluation of such images can be a time-consuming process and is subjective to human…Jonas Schulte-Sasse, Ben Steinfurth, Julien Weiss·Dec 10, 2024SaveLearn
Efficient methods for particle-resolved direct numerical simulationIn the present chapter we focus on the fundamentals of non-grid-conforming numerical approaches to simulating particulate flows, implementation issues and grid convergence vs. available reference…Markus Uhlmann, Jos Derksen, Anthony Wachs et al.·Dec 10, 2024SaveLearn
Design of a variable-Mach-number waverider by the osculating-curved-cone method using a rational distribution function and incorporating the equilibrium-gas modelWhen a waverider flies at hypersonic speed, the thermodynamic properties of the surrounding gas change because of the rapid increase in temperature, so it is reasonable to consider real-gas effects…Mengyu Wang, Yi Duan, Qin Li et al.·Dec 10, 2024SaveLearn
Collision Dynamics and Deformation Behaviors of Multi-Core Compound Droplet Pairs in Microchannel FlowWe numerically investigate the collision dynamics and deformation behaviors of double-core compound droplet pairs within confined shear flows using free-energy-based lattice Boltzmann method. While…S M Abdullah Al Mamun, Samaneh Farokhirad·Dec 10, 2024SaveLearn
Dynamics of vorticity moments in shell models of turbulence: A comparison with the Navier-Stokes equationsShell models allow much greater scale separations than those presently achievable with direct numerical simulations of the Navier-Stokes equations. Consequently, they are an invaluable tool for…John D. Gibbon, Dario Vincenzi·Dec 10, 2024SaveLearn