SPH calculations of Mars-scale collisions: The role of the equation of state, material rheologies, and numerical effects

Emsenhuber, Alexandre; Jutzi, Martin; Benz, Willy (2018). SPH calculations of Mars-scale collisions: The role of the equation of state, material rheologies, and numerical effects. Icarus, 301, pp. 247-257. Elsevier 10.1016/j.icarus.2017.09.017

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We model large-scale (≈ 2000 km) impacts on a Mars-like planet using a Smoothed Particle Hydrodynamics code. The effects of material strength and of using different Equations of State on the post-impact material and temperature distributions are investigated. The properties of the ejected material in terms of escaping and disc mass are analysed as well. We also study potential numerical effects in the context of density discontinuities and rigid body rotation. We find that in the large-scale collision regime considered here (with impact velocities of 4 km/s), the effect of material strength is substantial for the post-impact distribution of the temperature and the impactor material, while the influence of the Equation of State is more subtle and present only at very high temperatures.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Emsenhuber, Alexandre; Jutzi, Martin and Benz, Willy

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0019-1035

Publisher:

Elsevier

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Alexandre Emsenhuber

Date Deposited:

15 Nov 2017 12:43

Last Modified:

04 Dec 2017 13:31

Publisher DOI:

10.1016/j.icarus.2017.09.017

ArXiv ID:

1710.03245

BORIS DOI:

10.7892/boris.105759

URI:

https://boris.unibe.ch/id/eprint/105759

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