INVESTIGADORES
ELASKAR sergio Amado
congresos y reuniones científicas
Título:
Finite Volume Software for Gasdynamics and Magnetogasdynamics Equations
Autor/es:
ELASKAR, SERGIO; MAGLIONE, LIVIO; TAMAGNO, JOSÉ
Reunión:
Congreso; Pan-American Congress of Applied Mechanics - PACAM XI,; 2010
Resumen:
Two codes for computers have been developed. One, to study
flows in which an electrically conducting gas moves in a magnetic field and the
other one to solve Euler equations. The first code solves 2D, time-dependent,
viscous and resistive MGD flows. Its numerical approach is based on a finite
volume discretization technique and to compute the numerical fluxes across
cells interfaces, an approximate Riemann solver coupled with the Total
Variation Diminishing (TVD) scheme proposed by Harten and Yee is
utilized. The eigensystem introduced by Powell and the eigenvectors
normalization by Zarachay et al. have also been used. To verify its accuracy,
the MGD code has been applied to the simulations of a magnetogasdynamics
Riemann problem and of the Hartmann flow. The results obtained show good
agreement with those reported by other authors. In the second code, a TVD
scheme has been implemented on a non structured 3D finite volume formulation
for solving the Euler equations. To simultaneously, achieve adequate accuracy
in smooth flows, high resolution at flow discontinuities and to avoid spurious
oscillations, different flux limiter functions are applied in a wave-to-wave
basis. In this paper are analyzed the numerical viscosity reduction resulting
after using compressive limiter functions in waves from the families two to
four, and the ability of diffusive limiter functions for the family waves
one and five to capture pressure discontinuities whereas preserving the
robustness of the TVD scheme. This sort of adaptive scheme has satisfactorily
been applied to the slip interface between two parallel flows, and to
supersonic flows over and airfoil, a wedge and a blunted bi-conic body.