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Cautionary Remarks on Using SPH to Model the ISM in Galaxies

Published online by Cambridge University Press:  26 May 2016

P R Williams ,
D K Churches  and
A H Nelson
P R Williams
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, PR China
D K Churches
Affiliation:
Department of Physics and Astronomy, Cardiff University, Cardiff CF2 3YB, Wales, UK
A H Nelson
Affiliation:
Department of Physics and Astronomy, Cardiff University, Cardiff CF2 3YB, Wales, UK

Abstract

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In many SPH simulations of galaxy formation a lower limit is imposed on the kernel radius h equal to the gravitational softening length ∈. It has been found that such a constraint can in some circumstances compromise the spatial resolution to which hydrodynamical quantities are evaluated to the extent that the evolution of the gross features of a numerical galaxies are affected. Such effects can be avoided by allowing h to evolve freely to maintain a roughly constant number of neighbours in SPH summations. Here we focus on how imposing a constraint on h may affect the velocity field.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 226 - 227
Copyright
Copyright © Astronomical Society of the Pacific 2004