Zobrazeno 1 - 10
of 193
pro vyhledávání: '"Alain Pumir"'
Publikováno v:
PLoS ONE, Vol 18, Iss 3, p e0279940 (2023)
The beating of cilia and flagella, which relies on an efficient conversion of energy from ATP-hydrolysis into mechanical work, offers a promising way to propel synthetic cargoes. Recent experimental realizations of such micro-swimmers, in which micro
Externí odkaz:
https://doaj.org/article/bcca00d9c2054dbb95c22f3b9e54bb93
Publikováno v:
New Journal of Physics, Vol 25, Iss 10, p 103029 (2023)
The transfer of kinetic energy from large to small scales is a hallmark of turbulent flows. Yet, a precise mechanistic description of this transfer, which is expected to occur via an energy cascade, is still missing. Several conceptually simple confi
Externí odkaz:
https://doaj.org/article/f31c68610810400d8066ad74407021b1
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-7 (2020)
Whether a turbulent flow would inevitably develop singular behavior at the smallest length scales is an ongoing intriguing debate. Using large-scale numerical simulations, Buaria et al. find an unexpected non-linear mechanism which counteracts local
Externí odkaz:
https://doaj.org/article/602e1d6505444a41b554b4d45d799a68
Autor:
Dhawal Buaria, Alain Pumir
Publikováno v:
Physical Review Research, Vol 3, Iss 4, p L042020 (2021)
The nonlinear and nonlocal coupling of vorticity and strain rate constitutes a major hindrance in understanding the self-amplification of velocity gradients in turbulent fluid flows. Utilizing highly resolved direct numerical simulations of isotropic
Externí odkaz:
https://doaj.org/article/e04f45b0cd684bd8892b2368c2dbb249
Publikováno v:
Frontiers in Physics, Vol 7 (2019)
Externí odkaz:
https://doaj.org/article/026b643658cc422cb8b1a6eebe84ae3d
Autor:
Jose Negrete, Jr., Alain Pumir, Christian Westendorf, Marco Tarantola, Eberhard Bodenschatz, Carsten Beta
Publikováno v:
Physical Review Research, Vol 2, Iss 1, p 013239 (2020)
Living cells adjust their sensing and migratory machinery in response to changes in their environment. In this work, we show that cells of the social amoeba Dictyostelium discoideum modulate the dynamical state of their actin cytoskeleton in response
Externí odkaz:
https://doaj.org/article/93effbf4c3a74f92a1e5d47270517162
Publikováno v:
New Journal of Physics, Vol 21, Iss 4, p 043004 (2019)
Fully turbulent flows are characterized by intermittent formation of very localized and intense velocity gradients. These gradients can be orders of magnitude larger than their typical value and lead to many unique properties of turbulence. Using dir
Externí odkaz:
https://doaj.org/article/66a45db635ea403b923409004327a018
Publikováno v:
New Journal of Physics, Vol 20, Iss 10, p 103035 (2018)
In statistically stationary conditions, the turbulent energy spectrum in a high Reynolds number flow exhibits a k ^−5/3 (Kolmogorov) regime, with a faster decay at larger, dissipative wavenumbers. Here, we investigate how the energy spectrum of a t
Externí odkaz:
https://doaj.org/article/f133d0ca9fbc48a79b509250d2fc3c5e
Publikováno v:
PLoS ONE, Vol 10, Iss 3, p e0118443 (2015)
The spontaneous emergence of contraction-inducing electrical activity in the uterus at the beginning of labor remains poorly understood, partly due to the seemingly contradictory observation that isolated uterine cells are not spontaneously active. I
Externí odkaz:
https://doaj.org/article/cf1106b38019424e810fd4e5f063a842
Publikováno v:
New Journal of Physics, Vol 19, Iss 12, p 123030 (2017)
Phoresis, the drift of particles induced by scalar gradients in a flow, can result in an effective compressibility, bringing together or repelling particles from each other. Here, we ask whether this effect can affect the transport of particles in a
Externí odkaz:
https://doaj.org/article/c2874b9e9f1f419e8e126c87fae7e887