Linear stability and resolvent analyses of a bluff-body stabilized flame with conjugate heat transferConjugate heat transfer is a challenging fluid-structure coupling problem that can significantly influence flame stabilization and thermoacoustic instabilities. To properly capture combustion…Lu Chen, Wai Lee Chan, Yu Lv·Dec 18, 2024SaveLearn
Surface Wave-Aerodynamic Roughness Length Model for Air-Sea InteractionsA new model to evaluate the equivalent hydrodynamic length or surface roughness, z0, of ocean waves is developed and tested. The proposed Surface Wave-Aerodynamic Roughness Length (SWARL) model…Manuel Ayala, Dennice Gayme, Charles Meneveau·Dec 18, 2024SaveLearn
Spatial evolution of droplet size and velocity characteristics in a swirl spraySpray drop size distribution generated by atomization of fuel influences several facets of a combustion process such as, fuel-air mixing, reaction kinetics and thrust generation. In a typical spray,…S. K. Vankeswaram, V. Kulkarni, S. Deivandren·Dec 17, 2024SaveLearn
Coherent Structures Governing Transport at Turbulent InterfacesIn an experiment on a turbulent jet, we detect interfacial turbulent layers in a frame that moves, on average, along with the . This significantly prolongs the observation time of scalar and…Ali R Khojasteh, Lyke K van Dalen, Coen Been et al.·Dec 17, 2024SaveLearn
Generation of cosmic ray trajectories by a Diffusion Model trained on test particles in 3D magnetohydrodynamic turbulenceModels for the transport of high energy charged particles through strong magnetic turbulence play a key role in space and astrophysical studies, such as describing the propagation of solar energetic…Johannes Martin, Jeremiah Lübke, Tianyi Li et al.·Dec 17, 2024SaveLearn
Propulsive performance of a windsurf-inspired pitching foilWe study experimentally a symmetrical rigid foil performing pitching oscillations around a mean incidence angle (αm) with respect to an incoming flow in a hydrodynamic channel at a constant…Gauthier Bertrand, Tristan Aurégan, Benjamin Thiria et al.·Dec 17, 2024SaveLearn
Thin film flow over a spinning disc: Experiments and direct numerical simulationsThe dynamics of thin liquid films flowing over a spinning disc is studied through a combination of experiments and direct numerical simulations. We consider a comprehensive range of interfacial flow…Jason Stafford, Nwachukwu Uzo, Enrico Piccoli et al.·Dec 17, 2024SaveLearn
Discovering Boundary Equations for Wave Breaking using Machine LearningMany supervised machine learning methods have revolutionised the empirical modelling of complex systems. These empirical models, however, are usually "black boxes" and provide only limited physical…Tianning Tang, Yuntian Chen, Rui Cao et al.·Dec 16, 2024SaveLearn
Effect of local flow geometry on particle pair dispersion angleWe combine experiments in a von K\'arm\'an flow with numerical simulations of Taylor-Green and homogeneous and isotropic turbulence to study the effect of the local flow geometry on particle pair…B. L. Español, M. Noseda, P. J. Cobelli et al.·Dec 16, 2024SaveLearn
Data-Driven Modeling for On-Demand Flow Prescription in Fan-Array Wind TunnelsFan-array wind tunnels are an emerging technology to design bespoke wind fields through grids of individually controllable fans. This design is especially suited for the turbulent, dynamic,…Alejandro A. Stefan-Zavala, Isabel Scherl, Ioannis Mandralis et al.·Dec 16, 2024SaveLearn
Nonlinear Reduced-Order Modeling of Compressible Flow Fields Using Deep Learning and Manifold LearningThis paper presents a nonlinear reduced-order modeling (ROM) framework that leverages deep learning and manifold learning to predict compressible flow fields with complex nonlinear features,…Bilal Mufti, Christian Perron, Dimitri N. Mavris·Dec 16, 2024SaveLearn
Near Real-time Adaptive Isotropic and Anisotropic Image-to-mesh Conversion for Numerical Simulations Involving Cerebral AneurysmsPresented are two techniques that are designed to help streamline the discretization of complex vascular geometries within the numerical modeling process. The first method integrates multiple…Kevin Garner, Fotis Drakopoulos, Chander Sadasivan et al.·Dec 16, 2024SaveLearn
Coalescence of viscoelastic drops on a solid substrateThis study investigated the coalescence of polymer solution drops on the solid substrates. When two drops meet at their contact line on a substrate, the liquid bridge connecting the two drops…Peyman Rostami, Alexander Erb, Reza Azizmalayeri et al.·Dec 16, 2024SaveLearn
Effects of Thom disk on alleviating ground effects of a wall-mounted rotating cylinderThis study investigates the effects of Thom disks on alleviating ground effects by wall-mounted rotating cylinders, also known as Flettner rotors, which utilize wind energy for ship propulsion.…Bao-Yuan Zhao, Kai Zhang, Dai Zhou et al.·Dec 16, 2024SaveLearn
Calculating Spectra by Sequential High-Pass FilteringWe expand on the method of sequential filtering for calculating spectra of inhomogeneous fields. Sadek & Aluie [Phys. Rev. Fluids, 3, 124610 (2018)] showed that the kernel has to have at least p…Dongxiao Zhao, Hussein Aluie·Dec 16, 2024SaveLearn
Bayesian inference of mean velocity fields and turbulence models from flow MRIWe solve a Bayesian inverse Reynolds-averaged Navier-Stokes (RANS) problem that assimilates mean flow data by jointly reconstructing the mean flow field and learning its unknown RANS parameters. We…A. Kontogiannis, P. Nair, M. Loecher et al.·Dec 15, 2024SaveLearn
A Closed-Form Nonlinear Data Assimilation Algorithm for Multi-Layer Flow FieldsState estimation in multi-layer turbulent flow fields with only a single layer of partial observation remains a challenging yet practically important task. Applications include inferring the state of…Zhongrui Wang, Nan Chen, Di Qi·Dec 15, 2024SaveLearn
Symmetric instability in a Boussinesq fluid on a rotating planetSymmetric instability has broad applications in geophysical and planetary fluid dynamics. It plays a crucial role in the formation of mesoscale rainbands at mid-latitudes on Earth, instability in the…Yaoxuan Zeng, Malte F. Jansen·Dec 15, 2024SaveLearn
Irradiation-driven Evaporation of Micro Droplets in an Optical TrapSmall droplets are irradiated with visible and infrared light in many natural and industrial environments. One of the simplest ways to describe their evaporation is the D2-Law. It states that the…Jugal Rakesh Shah, Max Huisman, Devendra Deshmukh et al.·Dec 14, 2024SaveLearn
Turbulent/non-turbulent interface in high Reynolds number pressure gradient boundary layersWe report two-dimensional particle image velocimetry experiments in high Reynolds number turbulent boundary layers imposed with a moderately strong streamwise pressure gradient. The unique aspect of…Ivan Marusic, Wagih Abu Rowin, Mitchell Lozier et al.·Dec 14, 2024SaveLearn
Dynamics of cavitation bubbles inside a small cornerCavitation is a ubiquitous phenomenon in nature and bubble dynamics in open spaces have been widely studied, but the effects of the wall on the dynamics of cavitation bubbles in confined spaces are…Jinzhao Liu, Tianyou Wang, Zhizhao Che·Dec 14, 2024SaveLearn
Upstream flow geometries can be uniquely learnt from single-point turbulence signaturesWe test the hypothesis that the microscopic temporal structure of near-field turbulence downstream of a sudden contraction contains geometry-identifiable information pertaining to the shape of the…Mukesh Karunanethy, Raghunathan Rengaswamy, Mahesh V Panchagnula·Dec 14, 2024SaveLearn
Cavitation Onset in an Impulsively Accelerated Liquid ColumnThis paper introduces a novel piston-driven apparatus to study the onset of cavitation in an impulsively accelerated liquid column as it compresses a closed gas volume. The experiment is monitored…Taj Sobral, John Kokkalis, Kay Romann et al.·Dec 13, 2024SaveLearn
Instabilities of ring-rivulets: Impact of substrate wettabilityRivulets and droplets are naturally appearing shapes when small amounts of liquid are deposited on a partially wettable substrate. Here we study, by means of numerical simulations, the dewetting…Stefan Zitz, Andrea Scagliarini, Johan Roenby·Dec 13, 2024SaveLearn
Interface instability of two-phase flow in a three-dimensional porous mediumWe present an experimental study of immiscible, two-phase fluid flow through a three-dimensional porous medium consisting of randomly-packed, monodisperse glass spheres. Our experiments combine…Joachim Falck Brodin, Kevin Pierce, Paula Reis et al.·Dec 13, 2024SaveLearn