Heloise Meheut - OCA, Lagrange - Keywords: astrophysics, turbulence

Heloise Meheut - OCA, Lagrange - Keywords: astrophysics, turbulence

Contribution title: Astrophysical disks winds and turbulence

Astrophysical disks are common structures in the universe, they can be found around black holes, neutron stars or newly formed stars. They are currently intensively studied especially as it is now well known that planets are formed in such astrophysical disks: the protoplanetay disks. However, despites recent observational constraints, the question of their lifetime remains a mystery. Several scenario have been proposed to explain their long term evolution including magneto-hydrodynamical (MHD) turbulence or winds emitted from the disk. In sufficiently ionised disks, MHD turbulence could be responsible for the transport through the disk, whereas disk winds could allow ejection of matter away from the disk.

I will present high-performance global numerical simulations of astrophysical disks. These simulations are done with the finite volume MHD code RAMSES on an Adaptative Mesh Refinement (AMR) mesh. After a general introduction on the scientific domain and the methods used in this project, I will show that these two scenario can be coupled. The disk becomes turbulent due to the magneto-rotational instability (MRI), and this local phenomenon is at the origin of global astrophysical disks winds.