The atomizing pulsed jetDirect Numerical Simulations of the injection of a pulsed round liquid jet in a stagnant gas are performed in a series of runs of geometrically progressing resolution. The Reynolds and Weber numbers…Yash Kulkarni, Cesar Pairetti, Raphaël Villiers et al.·May 3, 2024SaveLearn
An analysis and solution of ill-conditioning in physics-informed neural networksPhysics-informed neural networks (PINNs) have recently emerged as a novel and popular approach for solving forward and inverse problems involving partial differential equations (PDEs). However,…Wenbo Cao, Weiwei Zhang·May 3, 2024SaveLearn
Symmetry breaking of rotating convection due to Non-Oberbeck-Boussinesq effectsThe non-Oberbeck--Boussinesq (NOB) effects arising from variations in thermal expansivity are theoretically and numerically studied in the context of rotating Rayleigh--B\'enard convection in forms…Shuang Wang, Wanying Kang·May 2, 2024SaveLearn
Two-layer baroclinic turbulence with arbitrary layer depthsWhile heat transport by baroclinic turbulence in oceans and planetary atmospheres is well described by a two-layer model, the relative depth of the two layers varies greatly depending on the…Gabriel Hadjerci, Basile Gallet·May 2, 2024SaveLearn
Data-driven modeling of the aerodynamic deformation and drag for a freely moving drop in the sub-critical Weber number regimeAccurate prediction of the dynamics and deformation of freely moving drops is crucial for numerous droplet applications. When the Weber number is finite but below a critical value, the drop deviates…T. Mahmood, A. Tonmoy, C. Sevart et al.·May 1, 2024SaveLearn
Quantifying small-scale anisotropy in turbulent flowsThe verification of whether small-scale turbulence is isotropic remains a grand challenge. The difficulty arises because the presence of small-scale anisotropy is tied to the dissipation tensor,…Subharthi Chowdhuri, Tirtha Banerjee·May 1, 2024SaveLearn
Numerical investigation of three-dimensional effects of cavitating flow in a venturi-type hydrodynamic cavitation reactorThe concept of Hydrodynamic Cavitation (HC) has emerged as a promising method for wastewater treatment, bio-diesel production and multiple other environmental processes with Venturi-type cavitation…Dhruv Apte, Mingming Ge, Olivier Coutier-Delgosha·May 1, 2024SaveLearn
Stochastic fluids with transport noise: Approximating diffusion from data using SVD and ensemble forecast back-propagationWe introduce and test methods for the calibration of the diffusion term in Stochastic Partial Differential Equations (SPDEs) describing fluids. We take two approaches, one uses ideas from the…James Woodfield·May 1, 2024SaveLearn
The origin of wall-shear stress fluctuations in wall-bounded turbulenceThe origin of wall shear-stress fluctuations in wall turbulence was studied through energy dissipation at the wall. While confirming the universality in wall dissipation at small inner scales, the…Myoungkyu Lee, Yongyun Hwang·May 1, 2024SaveLearn
Physics-Informed Acoustic Liner Optimization: Balancing Drag and NoiseWe present pore-resolved Direct Numerical Simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimized orifice configurations. Our DNS explore…Haris Shahzad, Stefan Hickel, Davide Modesti·May 1, 2024SaveLearn
Intrinsic phase based proper orthogonal decomposition (IPhaB POD): a method for physically interpretable modes in near-periodic systemsFluid dynamics systems driven by dominant, nearly periodic large-scale dynamics are common across wakes, jets, rotating machinery, and high-speed flows. Traditional decomposition techniques such as…Akhileshwar Borra, Zoey Flynn, Andres Goza et al.·May 1, 2024SaveLearn
Zeitlin truncation of a Shallow Water Quasi-Geostrophic model for planetary flowIn this work, we consider a Shallow-Water Quasi Geostrophic equation on the sphere, as a model for global large-scale atmospheric dynamics. This equation, previously studied by Verkley (2009) and…Arnout Franken, Martino Caliaro, Paolo Cifani et al.·May 1, 2024SaveLearn
Symbolic construction of the chemical Jacobian of quasi-steady state (QSS) chemistries for Exascale computing platformsThe Quasi-Steady State Approximation (QSSA) can be an effective tool for reducing the size and stiffness of chemical mechanisms for implementation in computational reacting flow solvers. However, for…Malik Hassanaly, Nicholas T. Wimer, Anne Felden et al.·Apr 30, 2024SaveLearn
Vorticity Suppression by Particle Lag Effects in Shock-Driven Multiphase InstabilityShock-driven multiphase mixing occurs in many physical systems such as explosive dispersal of chemical or biological agents, in the evolution of supernova remnants, and in supersonic and detonative…Vasco O. Duke-Walker, Jacob A. McFarland·Apr 30, 2024SaveLearn
Dynamics of particle aggregation in dewetting films of complex liquidsWe consider the dynamic wetting and dewetting processes of films and droplets of complex liquids on planar surfaces, focusing on the case of colloidal suspensions, where the particle interactions can…J. Zhang, D. N. Sibley, D. Tseluiko et al.·Apr 30, 2024SaveLearn
Bayesian calibration of bubble size dynamics applied to CO2 gas fermentersTo accelerate the scale-up of gaseous CO2 fermentation reactors, computational models need to predict gas-to-liquid mass transfer which requires capturing the bubble size dynamics, i.e. bubble…Malik Hassanaly, John M. Parra-Alvarez, Mohammad J. Rahimi et al.·Apr 30, 2024SaveLearn
Stabilized POD Reduced Order Models for convection-dominated incompressible flowsWe present a comparative computational study of two stabilized Reduced Order Models (ROMs) for the simulation of convection-dominated incompressible flow (Reynolds number of the order of a few…Pierfrancesco Siena, Michele Girfoglio, Annalisa Quaini et al.·Apr 30, 2024SaveLearn
Enduring two-dimensional perturbations with significant non-modal growthLaminar shear flows can display large non-modal perturbation growth, often through the lift-up mechansm, and can undergo subcritical transition to turbulence. The process is three-dimensional.…Sharath Jose·Apr 30, 2024SaveLearn
Short term vs. long term: optimization of microswimmer navigation on different time horizonsWe use reinforcement learning to find strategies that allow microswimmers in turbulence to avoid regions of large strain. This question is motivated by the hypothesis that swimming microorganisms…Navid Mousavi, Jingran Qiu, Lihao Zhao et al.·Apr 30, 2024SaveLearn
The influence of non-Newtonian behaviors of blood on the hemodynamics past a bileaflet mechanical heart valveThis study employs extensive three-dimensional direct numerical simulations (DNS) to investigate the influence of blood non-Newtonian behaviors on the hemodynamics around a bileaflet mechanical heart…A. Chauhan, C. Sasmal·Apr 30, 2024SaveLearn
Influence of the downstream blade sweep on cross-flow turbine performanceCross-flow turbine (known as vertical-axis wind turbines or ``VAWTs'' in wind) blades encounter a relatively undisturbed inflow for the first half of each rotational cycle (``upstream sweep'') and…Abigale Snortland, Aidan Hunt, Owen Williams et al.·Apr 29, 2024SaveLearn
Bounds to the Basset-Boussinesq force on particle laden stratified flowsThe Basset-Boussinesq force is often perfunctorily neglected when studying small inertial particles in turbulence. This force arises from the diffusion of vorticity from the particles and, since it…Christian Reartes, Pablo D. Mininni·Apr 29, 2024SaveLearn
Improved pressure-gradient sensor for the prediction of separation onset in RANS modelsWe improve upon two key aspects of the Menter shear stress transport (SST) turbulence model: (1) We propose a more robust adverse pressure gradient sensor based on the strength of the pressure…Kevin Patrick Griffin, Ganesh Vijayakumar, Ashesh Sharma et al.·Apr 29, 2024SaveLearn
A High-Fidelity Methodology for Particle-Resolved Direct Numerical SimulationsWe present a novel computational method for direct numerical simulations of particle-laden flows with fully-resolved particles (PR-DNS). The method is based on the recently developed Volume-Filtering…M. Houssem Kasbaoui, Marcus Herrmann·Apr 29, 2024SaveLearn
A molecular-kinetic hypothesis on the mechanics of compressible gas flow at low Mach numbersIn recent works, we proposed a theory of turbulence creation via the second coefficient of the virial expansion (i.e. the van der Waals effect). This theory relies, in part, on the empirically…Rafail V. Abramov·Apr 29, 2024SaveLearn