Centralized Gradient-Based Reconstruction for Wall Modelled Large Eddy Simulations of Hypersonic Boundary Layer TransitionIn this study, we introduce a robust central Gradient-Based Reconstruction (GBR) scheme for the compressible Navier-Stokes equations. The method leverages transformation to characteristic space,…Natan Hoffmann, Amareshwara Sainadh Chamarthi, Steven H. Frankel·May 18, 2024SaveLearn
Beyond Linear Decomposition: a Nonlinear Eigenspace Decomposition for a Moist Atmosphere with CloudsA linear decomposition of states underpins many classical systems. This is the case of the Helmholtz decomposition, used to split vector fields into divergence-free and potential components, and of…Antoine Remond-Tiedrez, Leslie M. Smith, Samuel N. Stechmann·May 17, 2024SaveLearn
Spectral Difference method with a posteriori limiting: II- Application to low Mach number flowsStellar convection poses two main gargantuan challenges for astrophysical fluid solvers: low-Mach number flows and minuscule perturbations over steeply stratified hydrostatic equilibria. Most methods…D. A. Velasco-Romero, R. Teyssier·May 17, 2024SaveLearn
SNF-ROM: Projection-based nonlinear reduced order modeling with smooth neural fieldsReduced order modeling lowers the computational cost of solving PDEs by learning a low-order spatial representation from data and dynamically evolving these representations using manifold projections…Vedant Puri, Aviral Prakash, Levent Burak Kara et al.·May 17, 2024SaveLearn
Multi-Point Gradient Estimation in TurbulenceWhen studying turbulence, it is often desirable to be able to estimate the local spatial gradient of a vector quantity using in situ measurements from a small number of irregularly spaced points.…Theodore Broeren, Kristopher Klein·May 17, 2024SaveLearn
Multiple states of two-dimensional turbulence above topographyThe recent work of Siegelman \& Young (PNAS, vol. 120(44), 2023, pp. e2308018120) revealed two extreme states reached by the evolution of unforced and weakly-damped two-dimensional turbulence above…Jiyang He, Yan Wang·May 17, 2024SaveLearn
A fully-implicit solving approach to an adaptive multi-scale model -- coupling a vertical-equilibrium and full-dimensional model for compressible, multi-phase flow in porous mediaVertical equilibrium models have proven to be well suited for simulating fluid flow in subsurface porous media such as saline aquifers with caprocks. However, in most cases the dimensionally reduced…Ivan Buntic, Martin Schneider, Bernd Flemisch et al.·May 17, 2024SaveLearn
Triple decomposition and sparse representation for noisy pressure-sensitive paint dataTriple decomposition is a useful analytical method for extracting the mean value, organized coherent motion, and stochastic part from a fluctuating quantity. Although the pressure-sensitive paint…Koyo Kubota, Makoto Takagi, Tsubasa Ikami et al.·May 17, 2024SaveLearn
Data-driven low-dimensional model of a sedimenting flexible fiberThe dynamics of flexible filaments entrained in flow, important for understanding many biological and industrial processes, are computationally expensive to model with full-physics simulations. This…Andrew J Fox, Michael D. Graham·May 16, 2024SaveLearn
Intermittency of inter-scale kinetic energy transfer and of energy exchange between internal and kinetic energy in turbulent premixed flamesInter-scale kinetic energy transfer in turbulent flows is accompanied by very intense and intermittent spatial-temporal fluctuations. Such intermittency is expected to be particularly prominent in…Vladimir A. Sabelnikov, Andrei N. Lipatnikov·May 16, 2024SaveLearn
A semi-analytical transient undisturbed velocity correction scheme for wall-bounded two-way coupled Euler-Lagrange simulationsIn the present paper, we model the velocity disturbance generated by a regularized forcing near a planar wall, which, along with the temporal nature of the forcing, provides an estimate of the…Akshay Chandran, Fabien Evrard, Berend van Wachem·May 16, 2024SaveLearn
Receptivity of a supersonic jet due to acoustic excitations near the nozzle lipIn this paper, we develop an analytical model to investigate the generation of instability waves triggered by the upstream acoustic forcing near the nozzle lip of a supersonic jet. This represents an…Binhong Li, Sicheng Zhang, Benshuai Lyu·May 16, 2024SaveLearn
Advection of the image point in probabilistically-reconstructed phase spacesInsufficient reference data is ubiquitous in data-driven computational fluid dynamics, as it is usually too expensive to compute or impossible to observe over long enough times needed for data-driven…Igor Shevchenko·May 15, 2024SaveLearn
Tip-leakage-flow excited unsteadiness and associated controlTip leakage flow in turbomachinery inherently generates intense unsteady features, named self-excited unsteadiness, which has not been well understood. A Zonalised LES (ZLES) is employed around a…Yabin Liu, Zhong-Nan Wang, Lei Tan et al.·May 15, 2024SaveLearn
Drag prediction of rough-wall turbulent flow using data-driven regressionEfficient tools for predicting the drag of rough walls in turbulent flows would have a tremendous impact. However, methods for drag prediction rely on experiments or numerical simulations which are…Zhaoyu Shi, Seyed Morteza Habibi Khorasani, Heesoo Shin et al.·May 15, 2024SaveLearn
Role of melting and solidification in the spreading of an impacting water dropThe present study reports experiments of water droplet impacting on ice or on a cold metallic substrate, with the aim of understanding the effect of phase change on the impingement process. Both…Wladimir Sarlin, Rodolphe Grivet, Julien Xu et al.·May 15, 2024SaveLearn
Self-diffusiophoretic propulsion of a spheroidal particle in a shear-thinning fluidShear-thinning viscosity is a non-Newtonian behaviour that active particles often encounter in biological fluids such as blood and mucus. The fundamental question of how this ubiquitous non-Newtonian…Guangpu Zhu, Brandon van Gogh, Lailai Zhu et al.·May 15, 2024SaveLearn
Effect of a fixed downstream cylinder on the flow-induced vibration of an elastically-supported primary cylinderThis paper numerically investigates the influence of a fixed downstream control cylinder on the flow-induced vibration of an elastically-supported primary cylinder. These two cylinders are situated…Junlei Wang, Shenfang Li, Daniil Yurchenko et al.·May 15, 2024SaveLearn
Data-driven discovery of drag-inducing elements on a rough surface through convolutional neural networksUnderstanding the influence of surface roughness on drag forces remains a significant challenge in fluid dynamics. This paper presents a convolutional neural network (CNN) that predicts drag solely…Heesoo Shin, Seyed Morteza Habibi Khorasani, Zhaoyu Shi et al.·May 15, 2024SaveLearn
Active flow control over a sphere using a smart morphable skinDimples on a sphere's surface can lead to significant drag reduction. However, the optimal dimple depth to minimize the drag varies with the Reynolds number (Re). In this study, a smart…Rodrigo Vilumbrales-Garcia, Putu Brahmanda Sudarsana, Anchal Sareen·May 14, 2024SaveLearn
Interpretable data-driven turbulence modeling for separated flows using symbolic regression with unit constraintsMachine learning techniques have been applied to enhance turbulence modeling in recent years. However, the "black box" nature of most machine learning techniques poses significant interpretability…Boqian Zhang, Juanmian Lei·May 14, 2024SaveLearn
Run-away transition to turbulent strong-field dynamoPlanets and stars are able to generate coherent large-scale magnetic fields by helical convective motions in their interiors. This process, known as hydromagnetic dynamo, involves nonlinear…Anna Guseva, Ludovic Petitdemange, Steven M. Tobias·May 14, 2024SaveLearn
Liquid Sheet Breakup in Gas-Centered Swirl Coaxial AtomizersThe study deals with the breakup behavior of swirling liquid sheets discharging from gas-centered swirl coaxial atomizers with attention focused toward the understanding of the role of central gas…V. Kulkarni, D. Sivakumar, C. Oommen et al.·May 14, 2024SaveLearn
An experimental and theoretical investigation of spray characteristics of impinging jets in impact wave regimeThe current study focuses on experimentally and theoretically improving the characterization of the drop size and drop velocity for like-on-like doublet impinging jets. The experimental measurements…Neil S. Rodrigues, Varun Kulkarni, Jian Gao et al.·May 14, 2024SaveLearn
QLingNet: An efficient and flexible modeling framework for subsonic airfoilsArtificial intelligence techniques are considered an effective means to accelerate flow field simulations. However, current deep learning methods struggle to achieve generalization to flow field…Kuijun Zuo, Zhengyin Ye, Linyang Zhu et al.·May 14, 2024SaveLearn