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DTSTART;TZID=Europe/Stockholm:20230627T193000
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UID:submissions.pasc-conference.org_PASC23_sess116_pos122@linklings.com
SUMMARY:P53 - Ultra-High Resolution Simulations of Planetary Collisions
DESCRIPTION:Poster\n\nThomas Meier, Christian Reinhardt, Douglas Potter, a
 nd Joachim Stadel (University of Zurich)\n\nGiant impacts (GI) form the la
 st stage of planet formation and play a key role in determining many aspec
 ts like the final structure of planetary systems and the masses and compos
 itions of its constituents. A common choice for numerically solving the eq
 uations of motion is the Smoothed Particle Hydrodynamics (SPH) method. We 
 present a new SPH code built on top of the modern gravity code pkdgrav3. T
 he code uses the Fast Multipole Method (FMM) on a distributed binary tree 
 to achieve O(N) scaling and is designed to use modern hardware (SIMD vecto
 rization and GPU). Neighbor finding in SPH is done for a whole group of pa
 rticles at once and is tightly coupled to the FMM tree code. It therefore 
 preserves the O(N) scaling from the gravity code. A generalized Equation o
 f State (EOS) interface allows the use of various material prescriptions. 
 Currently available are the ideal gas and EOS for the typical constituents
  of planets: rock, iron, water, and hydrogen/helium mixtures. With the exa
 mples of an equal mass merger between two Earth-like bodies and a mantle s
 tripping GI on Mercury (resolved with up to 200 million particles) we demo
 nstrate the advantages of high-resolution SPH simulations for planet scale
  impacts.
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