1999/11/02 by Eric Tittley, Eric R. Tittley, H. M. P. Couchman +4
Physics and Astronomy · #Astrophysics #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #Classical mechanics #Cosmology and Gravitation Theories #Drag #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Mechanics #Parasitic drag #Physics #RADIUS #Smoothed-particle hydrodynamics #Supersonic speed #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9911017
35 pages including 3 tables and 9 figures. Submitted to MNRAS. Postscript file also available at ftp://www.astro.uwo.ca/pub/etittley/papers/Drag.ps.gz
openalex publication_date 1999/11/02 · arxiv created 1999/11/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a study of hydrodynamic drag forces in smoothed particle simulations. In particular, the deceleration of a resolution-limited cold clump of gas moving through a hot medium is examined. It is found that the drag for subsonic velocities exceeds that predicted by simple physical approximations. This is shown to be a result of the hydrodynamical method which encourages the accretion of particles from the hot medium onto a shell around the cold clump, effectively increasing the radius of the clump. For sonic and supersonic velocities, the drag is shown to be dependent on the effective cross section of the clump. The consequences for cosmological simulations are discussed.