83,984 research outputs found
A GPU-enabled implicit Finite Volume solver for the ideal two-fluid plasma model on unstructured grids
This paper describes the main features of a pioneering unsteady solver for
simulating ideal two-fluid plasmas on unstructured grids, taking profit of
GPGPU (General-purpose computing on graphics processing units). The code, which
has been implemented within the open source COOLFluiD platform, is implicit,
second-order in time and space, relying upon a Finite Volume method for the
spatial discretization and a three-point backward Euler for the time
integration. In particular, the convective fluxes are computed by a multi-fluid
version of the AUSM+up scheme for the plasma equations, in combination with a
modified Rusanov scheme with tunable dissipation for the Maxwell equations.
Source terms are integrated with a one-point rule, using the cell-centered
value. Some critical aspects of the porting to GPU's are discussed, as well as
the performance of two open source linear system solvers (i.e. PETSc,
PARALUTION). The code design allows for computing both flux and source terms on
the GPU along with their Jacobian, giving a noticeable decrease in the
computational time in comparison with the original CPU-based solver. The code
has been tested in a wide range of mesh sizes and in three different systems,
each one with a different GPU. The increased performance (up to 14x) is
demonstrated in two representative 2D benchmarks: propagation of circularly
polarized waves and the more challenging Geospace Environmental Modeling (GEM)
magnetic reconnection challenge.Comment: 22 pages, 7 figure
Computational Physics on Graphics Processing Units
The use of graphics processing units for scientific computations is an
emerging strategy that can significantly speed up various different algorithms.
In this review, we discuss advances made in the field of computational physics,
focusing on classical molecular dynamics, and on quantum simulations for
electronic structure calculations using the density functional theory, wave
function techniques, and quantum field theory.Comment: Proceedings of the 11th International Conference, PARA 2012,
Helsinki, Finland, June 10-13, 201
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