Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Sesterhenn, Joern"'
Large-scale coherent structures are identified in turbulent pipe flow at $Re_\tau=181$ by having long lifetimes, living on large scales and travelling with a certain group velocity. A Characteristic Dynamic Mode Decomposition (CDMD) is used to detect
Externí odkaz:
http://arxiv.org/abs/2309.15189
Coherent structures in two-dimensional Navier-Stokes turbulence are ubiquitously observed in nature, experiments and numerical simulations. The present study conducts a comparison between several structure detection schemes based on the Okubo-Weiss c
Externí odkaz:
http://arxiv.org/abs/2203.11336
Monitoring active volcanos is an ongoing and important task helping to understand and predict volcanic eruptions. In recent years, analysing the acoustic properties of eruptions became more relevant. We present an inexpensive, lightweight, portable,
Externí odkaz:
http://arxiv.org/abs/2010.13158
Autor:
Sesterhenn, Jörn Lothar
Data assimilation is used to optimally fit a classical epidemiology model to the Johns Hopkins data of the Covid-19 pandemic. The optimisation is based on the confirmed cases and confirmed deaths. This is the only data available with reasonable accur
Externí odkaz:
http://arxiv.org/abs/2003.13071
Autor:
Stein, Lewin, Sesterhenn, Joern
Publikováno v:
J. Acta Mech (2019) 230: 2013
Acoustic models of resonant duct systems with turbulent flow depend on fitted constants based on expensive experimental test series. We introduce a new model of a resonant cavity, flush mounted in a duct or flat plate, under grazing turbulent flow. B
Externí odkaz:
http://arxiv.org/abs/1906.00319
Autor:
Engels, Thomas, Kolomenskiy, Dmitry, Schneider, Kai, Farge, Marie, Lehmann, Fritz-Olaf, Sesterhenn, Jörn
Publikováno v:
Phys. Rev. Fluids 4(1), 013103, 2019
Flapping insects are remarkably agile fliers, adapted to a highly turbulent environment. We present a series of high resolution numerical simulations of a bumblebee interacting with turbulent inflow. We consider both tethered and free flight, the lat
Externí odkaz:
http://arxiv.org/abs/1901.10350
A method to calculate the adjoint solution for a large class of partial differential equations is discussed. It differs from the known continuous and discrete adjoint, including automatic differentiation. Thus, it represents an alternative, third met
Externí odkaz:
http://arxiv.org/abs/1805.02421
Autor:
Spina, Laura, Taddeucci, Jacopo, Cannata, Andrea, Sciotto, Mariangela, Del Bello, Elisabetta, Scarlato, Piergiorgio, Kueppers, Ulrich, Andronico, Daniele, Privitera, Eugenio, Ricci, Tullio, Fernandez, Juan Jose Pena, Sesterhenn, Jörn, Dingwell, Donald Bruce
Publikováno v:
Bull Volcanol (2017) 79: 51
On 5 July 2014, an eruptive fissure opened on the eastern flank of Etna volcano (Italy) at ~3.000 m a.s.l. Strombolian activity and lava effusion occurred simultaneously at two neighbouring vents. In the following weeks, eruptive activity led to the
Externí odkaz:
http://arxiv.org/abs/1802.07583
Autor:
Kolomenskiy, Dmitry, Ravi, Sridhar, Takabayashi, Taku, Ikeda, Teruaki, Ueyama, Kohei, Engels, Thomas, Fisher, Alex, Tanaka, Hiroto, Schneider, Kai, Sesterhenn, Jörn, Liu, Hao
The aerial environment in the operating domain of small-scale natural and artificial flapping wing fliers is highly complex, unsteady and generally turbulent. Considering flapping flight in an unsteady wind environment with a periodically varying lat
Externí odkaz:
http://arxiv.org/abs/1610.09101
Autor:
Wilke, Robert, Sesterhenn, Jörn
Direct numerical simulations of sub- and supersonic impinging jets with Reynolds numbers of 3300 and 8000 are carried out to analyse their statistical properties. The influence of the parameters Mach number, Reynolds number and ambient temperature on
Externí odkaz:
http://arxiv.org/abs/1606.09167