Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Olivier, Samuel"'
Second Moment Methods (SMMs) are developed that are consistent with the Discontinuous Galerkin (DG) spatial discretization of the discrete ordinates (or \Sn) transport equations. The low-order (LO) diffusion system of equations is discretized with fu
Externí odkaz:
http://arxiv.org/abs/2404.17473
Thermal radiation transport (TRT) is a time dependent, high dimensional partial integro-differential equation. In practical applications such as inertial confinement fusion, TRT is coupled to other physics such as hydrodynamics, plasmas, etc., and th
Externí odkaz:
http://arxiv.org/abs/2401.04285
Autor:
Olivier, Samuel, Haut, Terry S.
We present high-order, finite element-based Second Moment Methods (SMMs) for solving radiation transport problems in two spatial dimensions. We leverage the close connection between the Variable Eddington Factor (VEF) method and SMM to convert existi
Externí odkaz:
http://arxiv.org/abs/2304.07386
Autor:
Olivier, Samuel, Haut, Terry S.
We apply high-order mixed finite element discretization techniques and their associated preconditioned iterative solvers to the Variable Eddington Factor (VEF) equations in two spatial dimensions. The mixed finite element VEF discretizations are coup
Externí odkaz:
http://arxiv.org/abs/2301.04758
We present a family of discretizations for the Variable Eddington Factor (VEF) equations that have high-order accuracy on curved meshes and efficient preconditioned iterative solvers. The VEF discretizations are combined with a high-order Discontinuo
Externí odkaz:
http://arxiv.org/abs/2111.12255
We present a new approach for solving high-order thermal radiative transfer (TRT) using the Variable Eddington Factor (VEF) method (also known as quasidiffusion). Our approach leverages the VEF equations, which consist of the first and second moments
Externí odkaz:
http://arxiv.org/abs/2104.07826
Autor:
Southworth, Ben S., Olivier, Samuel A.
For 2x2 block matrices, it is well-known that block-triangular or block-LDU preconditioners with an exact Schur complement (inverse) converge in at most two iterations for fixed-point or minimal-residual methods. Similarly, for saddle-point matrices
Externí odkaz:
http://arxiv.org/abs/2001.00711
Autor:
Yee, Ben C., Olivier, Samuel S., Haut, Terry S., Holec, Milan, Tomov, Vladimir Z., Maginot, Peter G.
We present a new flux-fixup approach for arbitrarily high-order discontinuous Galerkin discretizations of the SN transport equation. This approach is sweep-compatible: as the transport sweep is performed, a local quadratic programming (QP) problem is
Externí odkaz:
http://arxiv.org/abs/1910.02918
Publikováno v:
In Journal of Computational Physics 15 January 2023 473
Autor:
Anninos, Peter, Fragile, P. Chris, Olivier, Samuel S., Hoffman, Robert, Mishra, Bhupendra, Camarda, Karen
We present results from general relativistic calculations of the tidal disruption of white dwarf stars from near encounters with intermediate mass black holes. We follow the evolution of 0.2 and $0.6 M_\odot$ stars on parabolic trajectories that appr
Externí odkaz:
http://arxiv.org/abs/1808.05664