Volume 633, January 2020
|Number of page(s)||7|
|Section||Numerical methods and codes|
|Published online||06 January 2020|
Fragmentation and energy dissipation in collisions of polydisperse granular clusters
Physics Department and Research Center OPTIMAS, University Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
Accepted: 29 October 2019
Context. Dust aggregates consist of polydisperse grains following a power-law size distribution with an exponent of around 2.5, called the Mathis-Rumpl-Nordsieck (MRN) distribution.
Aims. We compare the outcome of collisions between polydisperse granular aggregates with those of monodisperse aggregates.
Methods. Granular-mechanics simulations were used to study aggregate collisions.
Results. Both with respect to the fragmentation threshold and to energy dissipation, MRN aggregates behave as monodisperse aggregates if their size corresponds approximately to the geometric mean of the largest and smallest radius of the MRN distribution.
Conclusions. Our results allow the polydisperse aggregates to be substituted with monodisperse aggregates, which are easier to simulate.
Key words: methods: numerical / protoplanetary disks / planets and satellites: formation
© ESO 2019
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