Thomas Padioleau
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View article: Exploring SYCL for batched kernels with memory allocations
Exploring SYCL for batched kernels with memory allocations Open
International audience
View article: HERACLES++: A multidimensional Eulerian code for exascale computing
HERACLES++: A multidimensional Eulerian code for exascale computing Open
Numerical simulations of multidimensional astrophysical fluids present considerable challenges. However, the development of exascale computing has significantly enhanced computational capabilities, motivating the development of new codes t…
View article: A multi-dimensional, robust, and cell-centered finite-volume scheme for the ideal MHD equations
A multi-dimensional, robust, and cell-centered finite-volume scheme for the ideal MHD equations Open
We present a new multi-dimensional, robust, and cell-centered finite-volume scheme for the ideal MHD equations. This scheme relies on relaxation and splitting techniques and can be easily used at high order. A fully conservative version is…
View article: Tackling exascale systems for astrophysics
Tackling exascale systems for astrophysics Open
Exascale systems are now appearing in the US, Japan, in Europe with two exascale procurements in the coming years and very likely in China. These systems offer great opportunities for the numerical astrophysics community and also raise ser…
View article: Recasting an operator splitting solver into a standard finite volume flux-based algorithm. The case of a Lagrange-Projection-type method for gas dynamics
Recasting an operator splitting solver into a standard finite volume flux-based algorithm. The case of a Lagrange-Projection-type method for gas dynamics Open
In this paper, we propose a modification of an acoustic-transport operator splitting Lagrange-projection method for simulating compressible flows with gravity. The original method involves two steps that respectively account for acoustic a…
View article: Nonideal self-gravity and cosmology: the importance of correlations in the dynamics of the large-scale structures of the Universe
Nonideal self-gravity and cosmology: the importance of correlations in the dynamics of the large-scale structures of the Universe Open
Inspired by the role of correlations in the statistical mechanics of nonideal self-interacting fluids, we suggest that unresolved sub-structures (i.e. correlations) have to be taken into account in the Virial theorem of self-gravitating as…
View article: Nonideal self-gravity and cosmology: Importance of correlations in the dynamics of the large-scale structures of the Universe
Nonideal self-gravity and cosmology: Importance of correlations in the dynamics of the large-scale structures of the Universe Open
Aims. Inspired by the statistical mechanics of an ensemble of interacting particles (BBGKY hierarchy), we propose to account for small-scale inhomogeneities in self-gravitating astrophysical fluids by deriving a nonideal virial theorem and…
View article: Radiative Rayleigh-Taylor instability and the structure of clouds in planetary atmospheres
Radiative Rayleigh-Taylor instability and the structure of clouds in planetary atmospheres Open
Aims. Clouds are expected to form in a broad range of conditions in the atmosphere of exoplanets given the variety of possible condensible species. This diversity, however, might lead to very different small-scale dynamics depending on rad…
View article: Idealised 3D simulations of diabatically forced Ledoux convection
Idealised 3D simulations of diabatically forced Ledoux convection Open
Aims. We investigate the impact of dimensionality, resolution, and long timescales on convective numerical simulations forced by thermo-compositional diabatic processes. We focus our study on simulations that are stable to the Schwarzschil…
View article: Idealised 3D simulations of diabatically-forced Ledoux convection. Application to the atmosphere of hot rocky exoplanets
Idealised 3D simulations of diabatically-forced Ledoux convection. Application to the atmosphere of hot rocky exoplanets Open
We investigate the impact on convective numerical simulations of thermo-compositional diabatic processes. We focus our study on simulations with a stabilizing temperature gradient and a destabilizing mean-molecular weight gradient. We aim …
View article: A high-performance and portable asymptotic preserving radiation hydrodynamics code with the M<sub>1</sub> model
A high-performance and portable asymptotic preserving radiation hydrodynamics code with the M<sub>1</sub> model Open
Aims. We present a new radiation hydrodynamics code called ARK-RT which uses a two-moment model with the M 1 closure relation for radiative transfer. This code was designed to be ready for high-performance computing on exascale architectur…
View article: Development of "all-régime" AMR simulation methods for fluid dynamics, application in astrophysics and two-phase flows
Development of "all-régime" AMR simulation methods for fluid dynamics, application in astrophysics and two-phase flows Open
Bien que performantes pour la capture des chocs, la plupart des méthodes de simulation standards ne sont pas adaptées à des régimes de Mach variés. Des méthodes numériques innovantes, utilisant des schémas de type Volumes Finis, robustes e…
View article: Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth’s Atmosphere and Oceans
Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth’s Atmosphere and Oceans Open
By generalizing the theory of convection to any type of thermal and compositional source terms (diabatic processes), we show that thermohaline convection in Earth’s oceans, fingering convection in stellar atmospheres, and moist convection …
View article: A High-performance and Portable All-Mach Regime Flow Solver Code with Well-balanced Gravity. Application to Compressible Convection
A High-performance and Portable All-Mach Regime Flow Solver Code with Well-balanced Gravity. Application to Compressible Convection Open
Convection is an important physical process in astrophysics well-studied using numerical simulations under the Boussinesq and/or anelastic approximations. However, these approaches reach their limits when compressible effects are important…