Statistics – Computation
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..229l&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 229-230 (SEE N93-26706 10-90)
Statistics
Computation
Astronomical Models, Computerized Simulation, Galactic Structure, Galaxies, Interstellar Matter, Wakes, Adiabatic Flow, Boundary Conditions, Computational Grids, Finite Difference Theory, Nonlinear Equations, Symmetry
Scientific paper
We have performed a series of numerical simulations which examine the simple but realistic case of a galaxy with a smooth potential corresponding to a King profile, and with no interstellar medium. This corresponds to the case of an early-type cluster galaxy that has previously been stripped of its gas. The simulations provide a numerical basis for future work involving galaxies with interstellar media. We use a time-explicit finite difference code (Lufkin & Hawley 1992, ApJ submitted) to obtain solutions to the nonlinear equations for adiabatic flow in axisymmetry. The computational grid covers a region extending 500 kpc from a stationary galaxy radially and along the symmetry axis. We use a graded mesh, allowing for full resolution near the galaxy. Because the assumed potential has a finite depth, no artificial inner boundary condition is necessary; reflection symmetry at the axis is assumed. With a total grid size of 64 radial x 128 vertical, each run requires approximately 5 minutes of cpu time on the NCSA Cray-2.
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