Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Taira, Kunihiko"'
Resolvent analysis is a powerful tool that can reveal the linear amplification mechanisms between the forcing inputs and the response outputs about a base flow. These mechanisms can be revealed in terms of a pair of forcing and response modes and the
Externí odkaz:
http://arxiv.org/abs/2404.11789
We present a data-driven feedforward control to attenuate large transient lift experienced by an airfoil disturbed by an extreme level of discrete vortex gust. The current analysis uses a nonlinear machine-learning technique to compress the high-dime
Externí odkaz:
http://arxiv.org/abs/2403.00263
We present a phase autoencoder that encodes the asymptotic phase of a limit-cycle oscillator, a fundamental quantity characterizing its synchronization dynamics. This autoencoder is trained in such a way that its latent variables directly represent t
Externí odkaz:
http://arxiv.org/abs/2403.06992
Publikováno v:
Journal of Fluid Mechanics, 984, R4, 2024
Nonlinear machine learning for turbulent flows can exhibit robust performance even outside the range of training data. This is achieved when machine-learning models can accommodate scale-invariant characteristics of turbulent flow structures. This st
Externí odkaz:
http://arxiv.org/abs/2402.17990
We perform direct numerical simulations (DNS) of actively controlled laminar separated wakes around low-aspect-ratio wings with two primary goals: (i) reducing the size of the separation bubble and (ii) attenuating the wing tip vortex. Instead of pre
Externí odkaz:
http://arxiv.org/abs/2402.12553
We study the effect of acceleration and deceleration on the stability of channel flows. To do so, we derive an exact solution for laminar profiles of channel flows with arbitrary, time-varying wall motion and pressure gradient. This solution then all
Externí odkaz:
http://arxiv.org/abs/2312.12701
Autor:
Neal, Jacob, Burtsev, Anton, Ribeiro, Jean Helder Marques, Taira, Kunihiko, Theofilis, Vassilios, Amitay, Michael
Experimental investigations were performed to elucidate the features of flow fields occurring over cantilevered finite-aspect ratio NACA 0015 wings at high angles of attack with various sweep angles and taper ratios. Volumetric Stereoscopic Particle
Externí odkaz:
http://arxiv.org/abs/2308.12442
Large amplitude gust encounters exhibit a range of separated flow phenomena, making them difficult to characterize using the traditional tools of aerodynamics. In this work, we propose a dynamical systems approach to gust encounters, viewing the flow
Externí odkaz:
http://arxiv.org/abs/2306.15829
We obtain an optimal actuation waveform for fast synchronization of periodic airfoil wakes through the phase reduction approach. Using the phase reduction approach for periodic wake flows, the spatial sensitivity fields with respect to the phase of t
Externí odkaz:
http://arxiv.org/abs/2306.11864
Autor:
Fukami, Kai, Taira, Kunihiko
Publikováno v:
Nature Communications, 14, 6480, 2023
Modern air vehicles perform a wide range of operations, including transportation, defense, surveillance, and rescue. These aircraft can fly in calm conditions but avoid operations in gusty environments, encountered in urban canyons, over mountainous
Externí odkaz:
http://arxiv.org/abs/2305.08024