Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ascl.soft10071s&link_type=abstract
Astrophysics Source Code Library, record ascl:1010.071
Astronomy and Astrophysics
Astrophysics
Scientific paper
Pairwise forces between particles in cosmological N-body simulations are generally softened to avoid hard collisions. Physically, this softening corresponds to treating the particles as diffuse clouds rather than point masses. For particles of unequal mass (and hence unequal softening length), computing the softened force involves a nontrivial double integral over the volumes of the two particles. We show that Plummer force softening is consistent with this interpretation of softening while spline softening is not. We provide closed-form expressions and numerical implementation for pairwise gravitational force laws for pairs of particles of general softening scales ɛ_1 and ɛ_2 assuming the commonly used cloud profiles: NGP, CIC, TSC, and PQS. Similarly, we generalize Plummer force law into pairs of particles of general softenings. We relate our expressions to the gaussian, Plummer and spline force softenings known from literature. Our expressions allow possible inclusions of pointlike particles such as stars or supermassive black holes.
No associations
LandOfFree
WSHAPE: Gravitational Softening and Adaptive Mass Resolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with WSHAPE: Gravitational Softening and Adaptive Mass Resolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WSHAPE: Gravitational Softening and Adaptive Mass Resolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1116370