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Euclid preparation. XXIX. Water ice in spacecraft part I: The physics of ice formation and contamination
Euclid Collaboration, M. Schirmer, K. Thürmer +218
Molecular contamination is a well-known problem in space flight. Water is the most common contaminant and alters numerous properties of a cryogenic optical system. Too much ice mea…
Spectral Difference method with a posteriori limiting: Application to the Euler equations in one and two space dimensions
David Velasco-Romero, Maria Han Veiga, Romain Teyssier
We present a new numerical scheme which combines the Spectral Difference (SD) method up to arbitrary high order with \emph{a-posteriori} limiting using the classical MUSCL-Hancock…
Numerical Methods for Simulating Star Formation
Romain Teyssier, Benoit Commercon
We review the numerical techniques for ideal and non-ideal magneto-hydrodynamics (MHD) used in the context of star formation simulations. We outline the specific challenges offered…
PKDGRAV3: Beyond Trillion Particle Cosmological Simulations for the Next Era of Galaxy Surveys
Douglas Potter, Joachim Stadel, Romain Teyssier
We report on the successful completion of a 2 trillion particle cosmological simulation to z=0 run on the Piz Daint supercomputer (CSCS, Switzerland), using 4000+ GPU nodes for a l…
Numerical cosmology on the GPU with Enzo and Ramses
Claudio Gheller, Peng Wang, Franco Vazza +1
A number of scientific numerical codes can currently exploit GPUs with remarkable performance. In astrophysics, Enzo and Ramses are prime examples of such applications. The two cod…
PHEW: a parallel segmentation algorithm for three-dimensional AMR datasets - application to structure detection in self-gravitating flows
Andreas Bleuler, Romain Teyssier, Sébastien Carassou +1
We introduce PHEW (Parallel HiErarchical Watershed), a new segmentation algorithm to detect structures in astrophysical fluid simulations, and its implementation into the adaptive…
A scheme for radiation pressure and photon diffusion with the M1 closure in RAMSES-RT
J. Rosdahl, R. Teyssier
We describe and test an updated version of radiation-hydrodynamics (RHD) in the RAMSES code, that includes three new features: i) radiation pressure on gas, ii) accurate treatment…
A fast, robust, and simple implicit method for adaptive time-stepping on adaptive mesh-refinement grids
Benoit Commercon, Vincent Debout, Romain Teyssier
Implicit solvers present strong limitations when used on supercomputing facilities and in particular for adaptive mesh-refinement codes. We present a new method for implicit adapti…
Simulating gamma-ray binaries with a relativistic extension of RAMSES
Astrid Lamberts, Sebastien Fromang, Guillaume Dubus +1
Gamma-ray binaries are composed of a massive star and a rotation-powered pulsar with a highly relativistic wind. The collision between the winds from both objects creates a shock s…
Radiation hydrodynamics with Adaptive Mesh Refinement and application to prestellar core collapse. I Methods
Benoit Commercon, Romain Teyssier, Edouard Audit +2
Radiative transfer has a strong impact on the collapse and the fragmentation of prestellar dense cores. We present the radiation-hydrodynamics solver we designed for the RAMSES cod…