Physical properties of particle agglomerates with respects to the planet formation process

在这个项目中，我们计划确定由μ m大小的颗粒组成的多孔尘埃团块的材料特性，这些颗粒被认为是原行星盘中行星形成的起始材料。该方法将是双重的：首先，我们将使用离散元方法进行从头算数值模拟的团聚体应用物理动力定律来描述单个粒子粒子之间的相互作用。为了加速模拟，我们将使算法适应现代GPU架构，这将允许我们使用105到106个粒子，从而弥合连续模型的差距。其次，我们将进行特殊目的的实验室实验团聚团聚体的相互作用，这将使我们能够测量集群的属性。使用这种双重方法将使我们能够确定在行星形成的最初阶段尘埃团块相互碰撞的物质特性和结果。

Within this project we plan to determine the material properties of porous dust agglomerates consisting of μm-sized particles, which are believed to be the starting material of planet formation in protoplanetary disks. The approach will be two-fold: Firstly, we will perform ab initio numerical simulations of agglomerates using a Discrete Element Method applying physically motivated force laws to describe individual particle-particle interactions. To accelerate the simulations, we will adapt the algorithms to modern GPU architectures, which will allow us to use 105 to 106 particles, thus bridging the gap towards a continuum model. Secondly, we will conduct special purpose laboratory experiments of agglomerate-agglomerate interactions which will allow us to measure the cluster properties. Using this two-fold approach will allow us to determine the material properties and outcome of mutual collisions of dust agglomerates in the very initial phase of planet formation.