Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286....1q&link_type=abstract
Astronomy and Astrophysics 286, 1-16 (1994)
Astronomy and Astrophysics
Astrophysics
7
Hydrodynamics, Methods: Numerical, Large-Scale Structure Of Universe
Scientific paper
Cosmological one-dimensional structures with pressure are considered. Their nonlinear evolution is studied. The partial differential equations for this evolution are numerically solved. The code is based on a modern high-resolution shock-capturing algorithm. The main goal of this paper is to prove that this algorithm can be applied in Cosmology. Baryon matter is considered as an ideal gas. In pressureless cases, our code is severely tested by comparing numerical results with Zel'dovich's solution. Pressure effects are discussed; in the case of a pure baryon fluid, the shell crossing phenomenon predicted by Zel'dovich's solution is either retarded or prevented by pressure. In the case of a mixing of baryons and collisionless particles, the total gravitational field plus pressure produce shocks. Possible extensions and improvements of the code are discussed.
Ibanez Miguel J.
Quilis Vicent
Saez Diego
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