Planetesimal precursors in turbulent protoplanetary disks

本项目的目标是利用湍流盘的直接数值模拟，详细研究嵌入的微行星前体（0.1μm -100 m）的动力学。粒子运动的分析将是双重的：在一部分中，我们确定碰撞速度和速率作为粒子大小的函数，在另一部分中，我们确定强耦合和弱耦合粒子的扩散速率。获得的数据将是项目B2-B5和C2的重要投入，也将用于项目D2。我们建立在我们的世界领先的经验，i）吸积盘的辐射磁流体动力学和ii）处理和分析拉格朗日粒子在三维直接模拟湍流。该项目是第一个资助期项目的直接后续行动，因为我们现在将结合联合收割机拉格朗日粒子和原行星盘的全球非理想辐射流体力学模拟。

The goal in this project is to utilize direct numerical simulations of turbulent disks and study in detail the dynamics of embedded planetesimal precursors ( 0.1μm - 100m). The analysis of the particle motion will be twofold: In one part we determine collision velocities and rates as a function of particle size and in the other part we determine diffusion rates for strongly and weakly coupled particles. The obtained data will be an essential input for projects B2-B5 and C2, and will also be used for project D2. We build on our world leading experience in i) Radiation-Magneto-Hydrodynamics of accretion disks and ii) the treatment and analysis of Lagrangian particles in 3D direct simulations of turbulence. This project is a direct follow-up of the project from the first funding period, as we now will combine Lagrange particles and global non-ideal radiation hydrodynamic simulations of protoplanetary disks.