Tootfinder

"In a probable cause statement, one officer wrote that the suspect 'knowingly engage[d] in conduct that create[d] a grave risk of death to another individual and thereby cause[d] the death of the other individual.'"
https://www.sltrib.com/news/politics/2025/

A demonstrator who was shot on Saturday during Salt Lake City’s “No Kings” protest has died, Utah police said on Sunday afternoon.
The man, Arthur Folasa Ah Loo, 39, had apparently been shot by a man who had been part of the event’s peacekeeping team.
“Our victim was not the intended target,” Brian Redd, the Salt Lake City police chief, said, “but rather an innocent bystander participating in the demonstration.”
Arturo Gamboa, 24, was taken into police custody on Saturday ev…

This https://arxiv.org/abs/2505.09869 has been replaced.
initial toot: https://mastoxiv.page/@a…

How does the limited resolution of space plasma analyzers affect the accuracy of space plasma measurements?
We investigate the systematic errors in measured plasma velocity distribution functions and their corresponding velocity moments, arising from the limited energy and angular resolution of top-hat electrostatic analyzers. For this purpose, we develop a forward model of a concept analyzer that simulates observations of typical solar wind proton plasma particles with their velocities following a Maxwell distribution function. We then review the standard conversion of the observations to physical p…

[2025-06-18 Wed (UTC), 15 new articles found for physics.flu-dyn Fluid Dynamics]
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[2025-06-18 Wed (UTC), 8 new articles found for physics.optics Optics]
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[2025-06-18 Wed (UTC), 3 new articles found for physics.ao-ph Atmospheric and Oceanic Physics]
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A simple and efficient second-order immersed-boundary method for the incompressible Navier--Stokes equations
Paolo Luchini, Davide Gatti, Alessandro Chiarini, Federica Gattere, Marco Atzori, Maurizio Quadrio
https://arxiv.org/abs/2506.14328

A simple and efficient second-order immersed-boundary method for the incompressible Navier--Stokes equations
An immersed-boundary method for the incompressible Navier--Stokes equations is presented. It employs discrete forcing for a sharp discrimination of the solid-fluid interface, and achieves second-order accuracy, demonstrated in examples with highly complex three-dimensional geometries. The method is implicit, meaning that the point in the solid which is nearest to the interface is accounted for implicitly, which benefits stability and convergence properties; the correction is also implicit in ti…

Triangular instability of a strained Batchelor vortex
A. S. P. Ayapilla (Graduate School of Information Sciences, Tohoku University, Sendai, Japan), Y. Hattori (Institute of Fluid Science, Tohoku University, Sendai, Japan), S. Le Diz\`es (Aix Marseille Universit\'e, CNRS, Centrale M\'editerran\'ee, IRPHE, Marseille, France)
https://

Triangular instability of a strained Batchelor vortex
We investigate the triangular instability of a Batchelor vortex subjected to a stationary triangular strain field generated by three satellite vortices, in the presence of weak axial flow. The analysis combines theoretical predictions with numerical simulations. Theoretically, the instability arises from resonant coupling between two quasi-neutral Kelvin modes with azimuthal wavenumbers $m$ and $m+3$ with the background strain. Numerically, we solve the linearized Navier-Stokes equations around…

Direct numerical simulations of inhalation in a 23-generation lung model
Marco Atzori, Emanuele Gallorini, Ciro Cottini, Andrea Benassi, Maurizio Quadrio
https://arxiv.org/abs/2506.14729

Direct numerical simulations of inhalation in a 23-generation lung model
The air flows in the proximal and distal portions of the human lungs are interconnected: the lower Reynolds number in the deeper generations causes a progressive flow regularization, while mass conservation requires flow rate oscillations to propagate through the airway bifurcations. To explain how these two competing effects shape the flow state in the deeper generations, we have performed the first high-fidelity numerical simulations of the air flow in a lung model including 23 successive bif…

Physics-Informed Neural Networks for the Korteweg-de Vries Equation for Internal Solitary Wave Problem: Forward Simulation and Inverse Parameter Estimation
Ming Kang, Hang Li, Qiwen Tan, Zhan Wang, Ruipeng Li, Junfang Zhao, Hui Xiang, Dixia Fan
https://arxiv.org/abs/2506.14236

Physics-Informed Neural Networks for the Korteweg-de Vries Equation for Internal Solitary Wave Problem: Forward Simulation and Inverse Parameter Estimation
Physics-informed neural networks (PINNs) have emerged as a transformative framework for addressing operator learning and inverse problems involving the Korteweg-de Vries (KdV) equation for internal solitary waves. By integrating physical constraints with data-driven optimization, PINNs overcome the critical challenges of parameter unmeasurability in the KdV equation for internal solitary waves in two-layer fluid systems. This work addresses two problems: (1) Operator learning constructs a mappi…