Cautionary Remarks on Using SPH to Model the ISM in Galaxies

Details Cautionary Remarks on Using SPH to Model the ISM in Galaxies Cautionary Remarks on Using SPH to Model the ISM in Galaxies

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..217..226w&link_type=abstract

International Astronomical Union Symposium no. 217, held 14-17 July, 2003 in Sydney, Australia. Edited by P.-A. Duc, J. Braine

Astronomy and Astrophysics

Astronomy

Scientific paper

In many SPH simulations of galaxy formation a lower limit is imposed on the kernel radius h equal to the gravitational softening length ɛ. 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.

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