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Collision and impact simulations including porosity

  • Willy Benz (a1) and Martin Jutzi (a1)

Abstract

The Smooth Particle Hydrodynamics (SPH) impact code (Benz & Asphaug 1994) has been developed for the simulation of impacts and collisions involving brittle solids in the strength-and gravity-dominated regime. In the latter regime, the gravitational overburden is used to increase the fracture threshold. In this paper, we extend our numerical approach to include the effect of porosity at a sub-resolution scale by adapting the so-called P -α model (Herrman 1969). Using our extended 3D SPH impact code, we investigated collisions between porous bodies to examine the sensitivity of collisional outcomes to the degree of porosity. Two applications that illustrate the capabilities of our approach are shown: 1) the modeling of a Deep Impact-like impact and 2) the computation of the amount of momentum transferred to an asteroid following the impact of a high velocity projectile.

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References

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Benz, W. 1992, in: Büchler, J.R. (eds.), The numerical modelling of nonlinear stellar pulsations: Problems and prospects (Springer: Berlin), p. 269.
Benz, W. & Asphaugh, E. 1994, Icarus 107, 98
Benz, W. & Asphaugh, E. 1995, Comp. Phys. Comm. 87, 253
Britt, D. T., Consolmagno, G. J. & Merline, W. J. 2006, 37th Annual Lunar and Planetary Science Conference, 2214
Carroll, M. M. & Holt, A. C. 1972, J. Appl. Phys. 43, 759
Herrmann, W. 1969, J. Appl. Phys. 40, 2490
Housen, K. R. & Holsapple, K. A. 2003, Icarus 163, 102
Jutzi, M. 2004, Diploma thesis, University of Bern
Libersky, L. D. & Petschek, A. G. 1990, in Lecture Notes in Physics 395, 248
Melosh, H. J. 1989, Impact cratering: A geologic process (Oxford: Oxford University Press)
Monaghan, J. J. 1992, Annu. Rev. Astron. Astrophys. 30, 543
Wuennemann, K., Collins, G. S. & Melosh, H. J. 2006, Icarus 180, 514
Wurm, G., Paraskov, G. & Krauss, O. 2005, Icarus 178, 253
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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