Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Käppeli, Roger"'
Autor:
Herde, Maximilian, Raonić, Bogdan, Rohner, Tobias, Käppeli, Roger, Molinaro, Roberto, de Bézenac, Emmanuel, Mishra, Siddhartha
We introduce Poseidon, a foundation model for learning the solution operators of PDEs. It is based on a multiscale operator transformer, with time-conditioned layer norms that enable continuous-in-time evaluations. A novel training strategy leveragin
Externí odkaz:
http://arxiv.org/abs/2405.19101
Autor:
Balsara, Dinshaw S., Käppeli, Roger
This paper examines a class of PDEs where some part of the PDE system evolves a vector field whose curl remains zero or grows in proportion to specified source terms. Such PDEs are referred to as curl-free or curl-preserving respectively. In this pap
Externí odkaz:
http://arxiv.org/abs/2108.09678
Several important PDE systems, like magnetohydrodynamics and computational electrodynamics, are known to support involutions where the divergence of a vector field evolves in divergence-free or divergence constraint-preserving fashion. Recently, new
Externí odkaz:
http://arxiv.org/abs/2009.03522
Autor:
Grosheintz-Laval, Luc, Käppeli, Roger
We present well-balanced finite volume schemes designed to approximate the Euler equations with gravitation. They are based on a novel local steady state reconstruction. The schemes preserve a discrete equivalent of steady adiabatic flow, which inclu
Externí odkaz:
http://arxiv.org/abs/2006.05960
We introduce novel high order well-balanced finite volume methods for the full compressible Euler system with gravity source term. They require no a priori knowledge of the hydrostatic solution which is to be well-balanced and are not restricted to c
Externí odkaz:
http://arxiv.org/abs/2005.01811
Autor:
Grosheintz, Luc, Käppeli, Roger
A high-order well-balanced scheme for the Euler equations with gravitation is presented. The scheme is able to preserve a spatially high-order accurate discrete representation of a large class of hydrostatic equilibria. It is based on a novel local h
Externí odkaz:
http://arxiv.org/abs/1807.04074
We present an Advanced Spectral Leakage (ASL) scheme to model neutrinos in the context of core-collapse supernovae and compact binary mergers. Based on previous gray leakage schemes, the ASL scheme computes the neutrino cooling rates by interpolating
Externí odkaz:
http://arxiv.org/abs/1511.08519
Publikováno v:
In Journal of Computational Physics 1 May 2020 408
Autor:
Perego, Albino, Rosswog, Stephan, Cabezon, Ruben, Korobkin, Oleg, Kaeppeli, Roger, Arcones, Almudena, Liebendoerfer, Matthias
We present a detailed, 3D hydrodynamics study of the neutrino-driven winds that emerge from the remnant of a NS merger. Our simulations are performed with the Newtonian, Eulerian code FISH, augmented by a detailed, spectral neutrino leakage scheme th
Externí odkaz:
http://arxiv.org/abs/1405.6730
Entropy solutions have been widely accepted as the suitable solution framework for systems of conservation laws in several space dimensions. However, recent results in \cite{CDL1,CDL2} have demonstrated that entropy solutions may not be unique. In th
Externí odkaz:
http://arxiv.org/abs/1402.0909