Výsledky vyhledávání - "Maxime Viallet"

Maxime Viallet (1922-2002), l’homme de la montagne

Autor: Messiez, Maurice

Publikováno v: Périodiques Scientifiques en Édition Électronique.

La vallée de Beaufort, en Savoie, tire un réel prestige de ses alpages bien conservés, de ses tarines, une race de vache adaptée à la montagne, et de son fromage, le beaufort, promu « prince des gruyères ». Pourtant, au milieu du XXe siècle,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______627::09570c0993a9261243e3706fd293b9cd
https://www.persee.fr/doc/acths_1764-7355_2012_act_134_8_2180

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A well-balanced scheme for the simulation tool-kit A-MaZe: implementation, tests, and first applications to stellar structure

Autor: Maxime Viallet, Rolf Walder, Roger Käppeli, M. V. Popov, Jane Pratt, C. Geroux, T. Constantino, T. Goffrey, Doris Folini, Isabelle Baraffe

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2019, 630, ⟨10.1051/0004-6361/201834180⟩
Astronomy & Astrophysics, 630
Astronomy & Astrophysics

Characterizing stellar convection in multiple dimensions is a topic at the forefront of stellar astrophysics. Numerical simulations are an essential tool for this task. We present an extension of the existing numerical tool-kit A-MaZe that enables su

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6900c63174b4346ff15ffd560156054f
https://hal-insu.archives-ouvertes.fr/insu-03711415

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The First 3D Simulations of Carbon Burning in a Massive Star

Autor: Andrea Cristini, Cyril Georgy, Casey Meakin, Raphael Hirschi, David Arnett, Maxime Viallet

Publikováno v: Proceedings of the International Astronomical Union. 12:237-241

We present the first detailed three-dimensional hydrodynamic implicit large eddy simulations of turbulent convection for carbon burning. The simulations start with an initial radial profile mapped from a carbon burning shell within a 15 solar mass st

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fdc9e0712a67b32812cd7155657ae4f
https://doi.org/10.1017/s1743921317003441

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Extreme value statistics for two-dimensional convective penetration in a pre-Main Sequence star

Autor: Maxime Viallet, Jane Pratt, Rolf Walder, T. Constantino, M. V. Popov, Isabelle Baraffe, Doris Folini, T. Goffrey

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 604, pp.A125. ⟨10.1051/0004-6361/201630362⟩
Astron.Astrophys.
Astron.Astrophys., 2017, 604, pp.A125. 〈10.1051/0004-6361/201630362〉
Astron.Astrophys., 2017, 604, pp.A125. ⟨10.1051/0004-6361/201630362⟩
Astronomy and Astrophysics-A&A, 2017, 604, pp.A125. ⟨10.1051/0004-6361/201630362⟩

We examine a penetration layer formed between a central radiative zone and a large convection zone in the deep interior of a young low-mass star. Using the Multidimensional Stellar Implicit Code (MUSIC) to simulate two-dimensional compressible stella

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a6217a1343c82a02cebfa247a7cb9a4
https://hal.archives-ouvertes.fr/hal-01645360

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Lithium depletion in solar-like stars: effect of overshooting based on realistic multi-dimensional simulations

Autor: Jane Pratt, M. V. Popov, Rolf Walder, Isabelle Baraffe, T. Goffrey, T. Constantino, Doris Folini, Maxime Viallet

Publikováno v: The Astrophysical Journal Letters
The Astrophysical Journal Letters, 2017, 845, ⟨10.3847/2041-8213/aa82ff⟩

We study lithium depletion in low-mass and solar-like stars as a function of time, using a new diffusion coefficient describing extra-mixing taking place at the bottom of a convective envelope. This new form is motivated by multi-dimensional fully co

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3D Simulations and MLT. I. Renzini’s Critique

Autor: Maxime Viallet, David Arnett, Etienne A. Kaiser, Cyril Georgy, Simon Campbell, Miroslav Mocák, Laura J. A. Scott, Raphael Hirschi, Casey Meakin, Andrea Cristini

Publikováno v: The Astrophysical Journal. 882:18

Renzini wrote an influential critique of “overshooting” in mixing-length theory (MLT), as used in stellar evolution codes, and concluded that three-dimensional fluid dynamical simulations were needed. Such simulations are now well tested. Implici

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7720d7e9c551e4340cd042711cfce238
https://doi.org/10.3847/1538-4357/ab21d9

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Spherical-shell boundaries for two-dimensional compressible convection in a star

Autor: M. V. Popov, Jane Pratt, T. Goffrey, Rolf Walder, Doris Folini, Maxime Viallet, Isabelle Baraffe, C. Geroux, T. Constantino

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2016, 593, ⟨10.1051/0004-6361/201628296⟩

Context: We study the impact of two-dimensional spherical shells on compressible convection. Realistic profiles for density and temperature from a one-dimensional stellar evolution code are used to produce a model of a large stellar convection zone r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7934490f3b84fd550b419b95699c770
http://arxiv.org/abs/1606.07200

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On the relevance of bubbles and potential flows for stellar convection

Autor: Achim Weiss, Wasilij Barsukow, M. M. Miller Bertolami, Vincent Prat, Maxime Viallet

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP

Recently Pasetto et al. have proposed a new method to derive a convection theory appropriate for the implementation in stellar evolution codes. Their approach is based on the simple physical picture of spherical bubbles moving within a potential flow

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8599d5d0f7a4b20ad19bbdb166e6aca4
http://fcaglp.fcaglp.unlp.edu.ar/evolgroup/Papers/ARTICLES/2016/MNRAS_2016_Miller_Bertolami_4441_53.pdf

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Linking 1D Evolutionary to 3D Hydrodynamical Simulations of Massive Stars

Autor: Raphael Hirschi, Cyril Georgy, Maxime Viallet, Casey Meakin, Andrea Cristini, David Arnett

Publikováno v: \physscr

Stellar evolution models of massive stars are important for many areas of astrophysics, for example nucleosynthesis yields, supernova progenitor models and understanding physics under extreme conditions. Turbulence occurs in stars primarily due to nu

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Multi-dimensional structure of accreting young stars

Autor: Jane Pratt, Rolf Walder, T. Goffrey, M. V. Popov, Maxime Viallet, Doris Folini, C. Geroux, Isabelle Baraffe, T. Constantino

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2016, 588, ⟨10.1051/0004-6361/201528038⟩

This work is the first attempt to describe the multi-dimensional structure of accreting young stars based on fully compressible time implicit multi-dimensional hydrodynamics simulations. One major motivation is to analyse the validity of accretion tr

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