New Users

Andrej

Relative Velocities and Collision Speeds of Particles in PPDs

Voelk et al. (1980) -> long standing result for formulas for relative velocities of two particles with different stopping times.

Particles of different stopping times drift differently and meet at higher velocities. Growth is hindered away from the diagonal.

First Science: shearing boxes with the Pencil code, forced hydro turbulence, MRI.

Results of collisional speeds.

Martin

Magnetic field dissipation in a jet

Originally for Poynting-flux dominated flows. If the field decays faster than 1/r it produces acceleration even beyond the Alfven radius (The radius at which magnetic pressure equals the thermal pressure, nearly equal to the magnetospheric radius).

Naturally produces radiation (gyromagnetic, ciclotron, sincrotron)

MHD in expanding coordinates. Interplay jet/box. IC: steady state wind 1D (1.5D solution)

BC: the biggest possible in the radial direction... (?)


Raphael

Chemical Symmetry breaking. One of the processes that was quite important for the emergence of life. Applications to astrobiology (explains why there is a "astrobiology_data" subroutine in chemistry.f90)

Plan to use the Pencil code in this problem: Inhomogeneities in the energy source. Put some localized sources of energy. Chemicals coming from crust, or light coming from above.