@article{Xiang_2021,
title = {Buckling Bars in Nearly Face-on Galaxies Observed with MaNGA},
author = {Katherine M Xiang and David M Nataf and E Athanassoula and Nadia L Zakamska and Kate Rowlands and Karen Masters and Amelia Fraser-McKelvie and Niv Drory and Katarina Kraljic},
url = {http://dx.doi.org/10.3847/1538-4357/abdab5},
doi = {10.3847/1538-4357/abdab5},
issn = {1538-4357},
year = {2021},
date = {2021-03-01},
journal = {The Astrophysical Journal},
volume = {909},
number = {2},
pages = {125},
publisher = {American Astronomical Society},
abstract = {Over half of disk galaxies are barred, yet the mechanisms for bar formation and the life-time of bar buckling remain poorly understood. In simulations, a thin bar undergoes a rapid (<1 Gyr) event called "buckling," during which the inner part of the bar is asymmetrically bent out of the galaxy plane and eventually thickens, developing a peanut/X-shaped profile when viewed side-on. Through analyzing stellar kinematics of N-body model snapshots of a galaxy before, during, and after the buckling phase, we confirm a distinct quadrupolar pattern of out-of-plane stellar velocities in nearly face-on galaxies. This kinematic signature of buckling allows us to identify five candidates of currently buckling bars among 434 barred galaxies in the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) Survey, an integral field unit (IFU) spectroscopic survey that measures the composition and kinematic structure of nearby galaxies. The frequency of buckling events detected is consistent with the 0.5-1 Gyr timescale predicted by simulations. The five candidates we present more than double the total number of candidate buckling bars, and are the only ones found using the kinematic signature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevFluids.6.024601,
title = {Laboratory model for plastic fragmentation in the turbulent ocean},
author = {Christophe Brouzet and Raphaël Guiné and Marie-Julie Dalbe and Benjamin Favier and Nicolas Vandenberghe and Emmanuel Villermaux and Gautier Verhille},
url = {https://link.aps.org/doi/10.1103/PhysRevFluids.6.024601},
doi = {10.1103/PhysRevFluids.6.024601},
year = {2021},
date = {2021-02-01},
journal = {Phys. Rev. Fluids},
volume = {6},
pages = {024601},
publisher = {American Physical Society},
abstract = {The fragmentation of solid objects in turbulence is of paramount importance in a large number of situations, especially for marine plastic pollution where small plastic debris are formed by the fragmentation of plastic litter under hydrodynamic forces. Up to now, investigations have focused on the fragmentation of particle aggregates in turbulent flows. Here we study the fragmentation of a single deformable object that behaves elastically up to breakage, in the inertial range of turbulence. Using laboratory experiments with glass fibers as a model system, complemented by numerical simulations and theoretical analyses, we exhibit a comprehensive fragmentation scenario, further modeled by an evolution equation. Our results demonstrate that the fragmentation process is limited at small scales by a physical cutoff length originating from the fluid-structure interactions between the objects and the turbulence, and therefore independent of the brittleness of the fibers. This scenario leads to the accumulation of fragments with a typical length slightly longer than the cutoff scale, as smaller fragments are too short to be deformed and broken by the turbulence.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{https://doi.org/10.1002/ejoc.202001599,
title = {Front Cover: Allosteric Guest Binding in Chiral Zirconium(IV) Double Decker Porphyrin Cages (Eur. J. Org. Chem. 4/2021)},
author = {Jeroen P J Bruekers and Matthijs A Hellinghuizen and Nicolas Vanthuyne and Paul Tinnemans and Pieter J Gilissen and Wybren Jan Buma and Jean-Valère Naubron and Jeanne Crassous and Johannes A A W Elemans and Roeland J M Nolte},
url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/ejoc.202001599},
doi = {https://doi.org/10.1002/ejoc.202001599},
year = {2021},
date = {2021-01-01},
journal = {European Journal of Organic Chemistry},
volume = {2021},
number = {4},
pages = {512-512},
abstract = {The Front Cover shows a chiral double decker porphyrin cage, which has been resolved into enantiomers (red and blue structures). The compound was characterized by various physical techniques, including X-ray and circular dichroism (spectra in the center). The porphyrin cage compound forms well-defined self-assembled monolayers on HOPG surfaces, which are visible by scanning tunneling microscopy (background). The binding of a guest (viologen) in one of the cages of the compound leads to a contraction of the other cage (indicated by the white wiggles), resulting in a greatly reduced guest binding in the latter cage (negative allosteric effect). More information can be found in the Full Paper by Roeland J.M. Nolte et al.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{CAI2021109995,
title = {Coupling of turbulence wall models and immersed boundaries on Cartesian grids},
author = {Shang-Gui Cai and Johan Degrigny and Jean-François Boussuge and Pierre Sagaut},
url = {https://www.sciencedirect.com/science/article/pii/S0021999120307695},
doi = {https://doi.org/10.1016/j.jcp.2020.109995},
issn = {0021-9991},
year = {2021},
date = {2021-01-01},
journal = {Journal of Computational Physics},
volume = {429},
pages = {109995},
abstract = {An improved coupling of immersed boundary method and turbulence wall models on Cartesian grids is proposed, for producing smooth wall surface pressure and skin friction at high Reynolds numbers. Spurious oscillations are frequently observed on these quantities with most immersed boundary wall modeling methods, especially for the skin friction which is found to be very sensitive to the solid surface's position and orientation against the Cartesian grids. The problem originates from the irregularity of the wall distance on the stair-step grid boundaries where the immersed boundary conditions are applied. To reduce this directional error, several modifications are presented to enhance the near wall solution. First, the commonly used interpolation for the flow velocity is replaced by one for the friction velocity, which has much less variation near wall. The concept of using a fictitious point to retrieve flow fields in the wall normal direction is abandoned and the interpolation is performed in the wall parallel plane with existing fluid points. Secondly, the velocity gradients at the approximated boundary are computed with advanced schemes and the normal gradient of the tangential velocity is reconstructed from the wall laws. To further protect the near wall solution, the normal velocity gradient and the working viscosity from the Spalart-Allmaras turbulence model are enforced by their theoretical solutions in the interior fluid close to the wall. Additionally, various post-processing algorithms for reconstructing wall surface quantities and force integrations are investigated. Other related factors are also discussed for their effects on the results. The validity of present method has been demonstrated through numerical benchmark tests on a flat plate at zero pressure gradient, both aligned and inclined with respect to the grid, as well as aerodynamic cases of NACA 23012 airfoil and NASA trap wing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{MAUGIS2021113632,
title = {Stability of Zener order in martensite: an atomistic evidence},
author = {Philippe Maugis and Damien Connétable and Paul Eyméoud},
url = {https://www.sciencedirect.com/science/article/pii/S1359646220307442},
doi = {https://doi.org/10.1016/j.scriptamat.2020.113632},
issn = {1359-6462},
year = {2021},
date = {2021-01-01},
journal = {Scripta Materialia},
volume = {194},
pages = {113632},
abstract = {Martensite is a supersaturated solid solution of carbon in body-centered iron wherein interstitial carbon atoms preferentially occupy a single octahedral sublattice. Despite a century of research, the mechanism of this long-range ordering is still a subject of debate. Recently, Zener’s theory of ordering was challenged both experimentally and theoretically. In an attempt to settle the controversy, we investigated by density functional theory the ground states of Fe-C configurations having various degrees of order. We conclude that the fully Zener-ordered configurations are always the most stable energetically, thus confirming Zener’s theory. Comparison with mean-field elasticity and Ising-type modelling supports the elastic origin of Zener ordering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{tayyab:hal-03160901,
title = {Lattice-Boltzmann modeling of a turbulent bluff-body stabilized flame},
author = {M Tayyab and S Zhao and Pierre Boivin},
url = {https://hal.archives-ouvertes.fr/hal-03160901},
doi = {10.1063/5.0038089},
year = {2021},
date = {2021-01-01},
journal = {Physics of Fluids},
volume = {33},
number = {3},
pages = {031701},
publisher = {American Institute of Physics},
abstract = {This letter reports the first large eddy simulation of a turbulent flame using a Lattice-Boltzmann model. To that end, simulation of a bluff-body stabilized propane-air flame is carried out, showing an agreement similar to those available in the literature. Computational costs are also reported, indicating that Lattice-Boltzmann modelling of reactive flows is competitive, with around 1000cpuh required to simulate one residence time in the 1,5m burner. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{MANDAL2021110810,
title = {Sticky islands in stochastic webs and anomalous chaotic cross-field particle transport by E×B electron drift instability},
author = {D Mandal and Y Elskens and X Leoncini and N Lemoine and F Doveil},
url = {https://www.sciencedirect.com/science/article/pii/S0960077921001624},
doi = {https://doi.org/10.1016/j.chaos.2021.110810},
issn = {0960-0779},
year = {2021},
date = {2021-01-01},
journal = {Chaos, Solitons & Fractals},
volume = {145},
pages = {110810},
abstract = {The E×B electron drift instability, present in many plasma devices, is an important agent in cross-field particle transport. In presence of a resulting low frequency electrostatic wave, the motion of a charged particle becomes chaotic and generates a stochastic web in phase space. We define a scaling exponent to characterise transport in phase space and we show that the transport is anomalous, of super-diffusive type. Given the values of the model parameters, the trajectories stick to different kinds of islands in phase space, and their different sticking time power-law statistics generate successive regimes of the super-diffusive transport.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{refId0d,
title = {On the reflection of time-domain acoustic spherical waves by a sinusoidal diffraction grating},
author = {Guochao} {Gao and Paul} {Cristini and Nathalie} {Favretto-Cristini and Carole} {Deumié},
url = {https://doi.org/10.1051/aacus/2020033},
doi = {10.1051/aacus/2020033},
year = {2021},
date = {2021-01-01},
journal = {Acta Acust.},
volume = {5},
pages = {6},
abstract = {This work reports on some results obtained from numerical simulations of time-domain acoustic wave propagation in the presence of a periodically rough interface. Emphasis is put on the structure of the reflected signals in the presence of a sinusoidal grating. More specifically, we investigate the effect of the frequency bandwidth of the emitted signal and the effect of the incident wavefront sphericity on the signals reflected from the rough interface and associated with the different diffraction orders.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{articled,
title = {Parallel modeling of wildfires using efficient solvers for ill-conditioned linear systems},
author = {Oleg Bessonov and Sofiane Meradji},
doi = {10.1007/s11227-021-03632-8},
year = {2021},
date = {2021-01-01},
journal = {The Journal of Supercomputing},
abstract = {Numerical simulation of multi-physical processes requires a lot of processor time,
especially when solving ill-conditional linear systems arising in fluid dynamics
problems. This paper is devoted to the development of efficient parallel methods for
such systems for FireStar3D wildfire modeling code. Two alternative approaches
are discussed and analyzed, based on the MILU-preconditioned conjugate gradient
method and on the algebraic multigrid, respectively. The main difficulties of paral-
lelizing these methods are considered and solutions are presented: in the first case,
nested twisted factorization with a staircase pipelining, and in the second, a multi-
color technique for a new smoother for strongly anisotropic grids. A novel quasi-
geometric interpolation technique is presented for solving the problem of positive
off-diagonal matrix entries in the multigrid. The limits of applicability of the meth-
ods are determined depending on their flexibility, robustness and parallelization
capabilities. The performance comparison demonstrates the superiority of the new
methods over the widely used variants of the traditional conjugate gradient method.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}