6,043 research outputs found
Parallel Computation of Finite Element Navier-Stokes codes using MUMPS Solver
The study deals with the parallelization of 2D and 3D finite element based Navier-Stokes codes using direct solvers. Development of sparse direct solvers using multifrontal solvers has significantly reduced the computational time of direct solution methods. Although limited by its stringent memory requirements, multifrontal solvers can be computationally efficient. First the performance of MUltifrontal Massively Parallel Solver (MUMPS) is evaluated for both 2D and 3D codes in terms of memory requirements and CPU times. The scalability of both Newton and modified Newton algorithms is tested
Domain Decomposition Based High Performance Parallel Computing\ud
The study deals with the parallelization of finite element based Navier-Stokes codes using domain decomposition and state-ofart sparse direct solvers. There has been significant improvement in the performance of sparse direct solvers. Parallel sparse direct solvers are not found to exhibit good scalability. Hence, the parallelization of sparse direct solvers is done using domain decomposition techniques. A highly efficient sparse direct solver PARDISO is used in this study. The scalability of both Newton and modified Newton algorithms are tested
Collective non-Abelian instabilities in a melting Color Glass Condensate
We present first results for 3+1-D simulations of SU(2) Yang-Mills equations
for matter expanding into the vacuum after a heavy ion collision. Violations of
boost invariance cause a Weibel instability leading soft modes to grow with
proper time as , where is a
scale arising from the saturation of gluons in the nuclear wavefunction. The
scale for the growth rate is set by a plasmon mass, defined as
, generated dynamically
in the collision. We compare the numerical ratio to the
corresponding value predicted by the Hard Thermal Loop formalism for
anisotropic plasmas.Comment: 4 pages, 4 figures, revtex4; v2: typos corrected, discussion on
growth rate in expanding system added, accepted for publication in PR
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