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Simulations of asteroid collisions using a hybrid SPH/N-body approach
Ševeček, Pavel ; Brož, Miroslav (advisor) ; Kobayashi, Hiroshi (referee) ; Schäfer, Christoph M. (referee)
Understanding asteroid collisions is a key part of Solar System science. To in- terpret observations of more than 100 asteroid families, various numerical sim- ulations are used. In this work, we prefer the smoothed particle hydrodynamics (SPH), which allows a detailed description of impact mechanics, shock wave propagation, fragmentation of the target, ejection, or reaccumulation controlled by self-gravity and secondary collisions. Since the respective time scale may reach the orbital time scale, the SPH is often complemented by efficient N-body integrators and collisional handlers. In the review part of the thesis, we describe details of numerical methods and their implementation in the new OpenSPH code. We also thoroughly test the code, using analytical solutions and labora- tory experiments as references, and discuss its stability and convergence with respect to spatial resolution. In the refereed papers, included in the thesis, we focus on collisions with targets of particular sizes (D = 10 and 100 km). We explore the dependence of outcomes on the target size, the projectile size, the impact speed, the impact angle, and most importantly, the initial spin rate. We demonstrate that rotation significantly decreases the effective strength of the targets and increases the ejected mass. We self-consistently...
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