Planetesimal precursors in turbulent protoplanetary disks

这个项目的目标是利用湍流圆盘的直接数值模拟，详细研究嵌入的行星小前兆(0.1μm-100m)的动力学。对粒子运动的分析将分为两部分：一部分我们确定碰撞速度和速率作为粒子大小的函数，另一部分我们确定强耦合和弱耦合粒子的扩散速率。所获得的数据将是项目B2-B5和C2的基本输入，也将用于项目D2。我们在i)吸积盘的辐射-磁流体动力学和ii)在湍流的3D直接模拟中处理和分析拉格朗日粒子方面建立在我们的世界领先经验的基础上。这个项目是从第一个资助期开始的项目的直接后续行动，因为我们现在将结合拉格朗日粒子和原始行星盘的全球非理想辐射流体动力学模拟。

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.