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DTSTAMP:20250822T115807Z
LOCATION:Campussaal - Plenary Room
DTSTART;TZID=Europe/Stockholm:20250617T103000
DTEND;TZID=Europe/Stockholm:20250617T110000
UID:submissions.pasc-conference.org_PASC25_sess150_pos106@linklings.com
SUMMARY:P39 - Simulations of Giant Impacts with Material Strength in pkdgr
 av3
DESCRIPTION:Thomas Meier (University of Zurich); Christian Reinhardt (Univ
 ersity of Zurich, University of Bern); and Douglas Potter and Joachim Stad
 el (University of Zurich)\n\nGiant impacts form the last stage of planet f
 ormation and play a key role in determining many aspects like the final st
 ructure of planetary systems and the masses and compositions of its consti
 tuents. A common choice for numerically solving the equations of motion is
  the Smoothed Particle Hydrodynamics (SPH) method. We present a new SPH co
 de with material strength built on top of the modern gravity code pkdgrav3
 . The code uses the Fast Multipole Method on a distributed binary tree to 
 achieve O(N) scaling and is designed to use modern hardware (SIMD vectoriz
 ation and GPU). Neighbor finding in SPH is done for a whole group of parti
 cles at once and is tightly coupled to the FMM tree code. It therefore pre
 serves the scaling from the gravity code. A generalized Equation of State 
 (EOS) interface allows the use of various material prescriptions. A shear 
 strength formulation allows proper treatment of shock propagation in low v
 elocity impacts or smaller bodies and the preservation of craters and othe
 r structures formed by impacts. With the example of the formation of the C
 aloris basin on Mercury (resolved with up to 2 billion particles) we demon
 strate the advantages of high-resolution SPH simulations for planet scale 
 impacts.\n\nSession Chair: David Moxey (King's College London)\n\n
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