A fully differentiable GNN-based PDE Solver: With Applications to Poisson and Navier-Stokes EquationsIn this study, we present a novel computational framework that integrates the finite volume method with graph neural networks to address the challenges in Physics-Informed Neural Networks(PINNs). Our…Tianyu Li, Yiye Zou, Shufan Zou et al.·May 7, 2024SaveLearn
Geometric approaches to Lagrangian averagingLagrangian averaging theories, most notably the Generalised Lagrangian Mean (GLM) theory of Andrews & McIntyre (1978), have been primarily developed in Euclidean space and Cartesian coordinates. We…Andrew D. Gilbert, Jacques Vanneste·May 7, 2024SaveLearn
Alfv\'en waves at low magnetic Reynolds number: Transitions between diffusion, dispersive Alfv\'en waves and nonlinear propagationThis paper seeks whether Alfv\'en waves (AW) can be produced in laboratory-scale liquid metal experiments, i.e. at low-magnetic Reynolds Number (R\!m). AW are incompressible waves…Samy Lalloz, Laurent Davoust, François Debray et al.·May 7, 2024SaveLearn
Thermal convection in a higher velocity gradient and higher temperature gradient fluidWe analyse a model for thermal convection in a class of generalized Navier-Stokes equations containing fourth order spatial derivatives of the velocity and of the temperature. The work generalises…Giulia Giantesio, Alberto Girelli, Chiara Lonati et al.·May 7, 2024SaveLearn
Stationary and non-stationary energy cascades in homogeneous ferrofluid turbulenceThe nonlinear transfer rate of the total energy (transfer rate of kinetic energy + transfer rate due to the work done by the magnetization) for an incompressible turbulent ferrofluid system is…Sukhdev Mouraya, Nandita Pan, Supratik Banerjee·May 7, 2024SaveLearn
Logarithmic lattice models for flows with boundariesMany fundamental problems in fluid dynamics are related to the effects of solid boundaries. In general, they install sharp gradients and contribute to the developement of small-scale structures,…Ciro S. Campolina, Alexei A. Mailybaev·May 7, 2024SaveLearn
A hydrodynamic approach to reproduce multiple spinning vortices in horizontally rotating three-dimensional liquid helium-4This paper reports a three-dimensional (3D) simulation of a rotating liquid helium-4, using a two-fluid model with spin-angular momentum conservation. Our model was derived from the particle…Satori Tsuzuki·May 7, 2024SaveLearn
Approximating a branch of solutions to the Navier--Stokes equations by reduced-order modelingThis paper extends a low-rank tensor decomposition (LRTD) reduced order model (ROM) methodology to simulate viscous flows and in particular to predict a smooth branch of solutions for the…Maxim A. Olshanskii, Leo G. Rebholz·May 6, 2024SaveLearn
Communities for the Lagrangian Dynamics of the Turbulent Velocity Gradient Tensor: A Network Participation ApproachComplex network analysis methods have been widely applied to nonlinear systems, but applications within fluid mechanics are relatively few. In this paper, we use a network for the Lagrangian dynamics…Christopher J. Keylock, Maurizio Carbone·May 6, 2024SaveLearn
Reynolds-number dependence of streamwise velocity variance in wall-bounded turbulent flowsWe propose a model for the streamwise velocity variance in wall-bounded turbulent flows. It hypothesizes that the wall-parallel motions of the attached eddies induce internal turbulent boundary…Chenning Tong·May 6, 2024SaveLearn
Tunable drag drop via flow-induced snap-through in origamiWe leverage the snap-through response of a bistable origami mechanism to induce a discontinuous evolution of drag with flow speed. The transition between equilibrium states is passively actuated by…Rishabh Nain, Tom Marzin, Sophie Ramananarivo·May 6, 2024SaveLearn
A second-generation URANS model (STRUCT-ε) applied to a Generic Side Mirror and its Impact on Sound GenerationA generic side mirror can be approximated to the combination of a half cylinder topped with a quarter of sphere. The flow structure in the wake of the side mirror is highly transient and the…Jorge Munoz-Paniagua, Javier García, Eduardo Latorre-Iglesias·May 6, 2024SaveLearn
Hydrodynamics of vortex memory system driven by edge-current and boundary magnetizationIn this study, a magnetohydrodynamic model is developed to study the dynamics of vortices driven by edge-current. Two modeled equations for fluid and magnetic field variables are each transformed…Rabiu Musah·May 5, 2024SaveLearn
The best whistler: a cavitating tip vortexThe discrete tone radiated from a cavitating tip vortex, known as "vortex singing", was first recognized in 1989, but its sound generation mechanism has remained a mystery for over thirty years. In…Zhaohui Qian, Weixiang Ye, Yongshun Zeng et al.·May 5, 2024SaveLearn
Trigger mechanism for a singing cavitating tip vortexThe discrete tone radiated from tip vortex cavitation (TVC), known as 'vortex singing', was recognized in 1989, but its triggering remains unclear for over thirty years. In this study, the desinent…Zhaohui Qian, Yongshun Zeng, Xiaoxing Peng et al.·May 5, 2024SaveLearn
Weakening the effect of boundaries: `diffusion-free' boundary conditions as a `do least harm' alternative to NeumannIn this note, we discuss a poorly known alternative boundary condition to the usual Neumann or `stress-free' boundary condition typically used to weaken boundary layers when diffusion is present but…Yufeng Lin, Rich Kerswell·May 5, 2024SaveLearn
A hydrodynamic model of capillary flow in an axially symmetric tube with a non-slowly-varying cross section and a boundary slipThe capillary flow of a Newtonian and incompressible fluid in an axially symmetric horizontal tube with a non-slowly-varying cross section and a boundary slip is considered theoretically under the…Masao Iwamatsu·May 5, 2024SaveLearn
New Interpretation for error propagation of data-driven Reynolds stress closures via global stability analysisIn light of the challenges surrounding convergence and error propagation encountered in Reynolds-averaged Navier-Stokes (RANS) equations with data-driven Reynolds stress closures, researchers…Xianglin Shan, Wenbo Cao, Weiwei Zhang·May 4, 2024SaveLearn
Swimming efficiency in viscosity gradientsIn this note, we study the effect of viscosity gradients on the energy dissipated by the motion of microswimmers and the associated efficiency of that motion. Using spheroidal squirmer model swimmers…Jiahao Gong, Vaseem A. Shaik, Gwynn J. Elfring·May 3, 2024SaveLearn
Generalized Solution for Double-Porosity Flow through a Graded Excavation Damaged ZonePrediction of flow to boreholes or excavations in fractured low-permeability rocks is important for resource extraction and disposal or sequestration activities. Analytical solutions for fluid…Kristopher L. Kuhlman·May 3, 2024SaveLearn
Spatiotemporal spectral transfers in fluid dynamicsMotivated by previous work on kinetic energy cascades in the ocean and atmosphere, we develop a spatio-temporal spectral transfer tool that can be used to study scales of variability in generalized…Avik Mondal, Andrew J. Morten, Brian K. Arbic et al.·May 3, 2024SaveLearn
On the origin of circular rolls in rotor-stator flowRotor-stator flows are known to exhibit instabilities in the form of circular and spiral rolls. While the spirals are known to emanate from a supercritical Hopf bifurcation, the origin of the…Artur Gesla, Yohann Duguet, Patrick Le Quéré et al.·May 3, 2024SaveLearn
Intermittent thermal convection in jammed emulsionsWe study the process of thermal convection in jammed emulsions with a yield-stress rheology. We find that heat transfer occurs via an intermittent mechanism, whereby intense short-lived convective…Francesca Pelusi, Andrea Scagliarini, Mauro Sbragaglia et al.·May 3, 2024SaveLearn
Experimental jet control with Bayesian optimization and persistent data topologyThis study experimentally optimizes the mixing of a turbulent jet at Re=10000 with the surrounding air by targeted shear layer actuation. The forcing is composed of superposed harmonic signals of…Johann Moritz Reumschüssel, Yiqing Li, Philipp Maximilian zur Nedden et al.·May 3, 2024SaveLearn
Simulation of stopping vortices in the flow past a mounted wedgeThis work is concerned with the numerical investigation of the dynamics of stopping vortex formation in the uniform flow past a wedge mounted on a wall for channel Reynolds number Rec=1560. The…Jiten C Kalita·May 3, 2024SaveLearn