130 citations · 131 across the 6 of their papers we have counts for
6 papers
A fast spectral-multigrid Poisson solver in non-Cartesian geometries
Ankush Mandal, Oliver Gressel, Udo Ziegler +1
Accurate and efficient computation of self-gravity is essential in astrophysical fluid dynamics, particularly in spherical and cylindrical geometries where large radial dynamic ran…
Self-gravity in thin protoplanetary discs: 1. The smoothing-length approximation versus the exact self-gravity kernel
S. Rendon Restrepo, T. Rometsch, U. Ziegler +1
Planet-forming discs often contain structures like spiral arms, typically linked to the disc's gravitational forces. In 2D models, an ad hoc softening prescription is commonly used…
First snapshot of a magnetosphere around a Herbig Ae/Be star
S. P. Järvinen, S. Hubrig, M. Küker +6
The Herbig Ae/Be star HD190073 is one of the very few magnetic Herbig Ae/Be stars for which close low-mass companions have been reported. Previously published magnetic field measur…
Gravito-turbulent bi-fluid protoplanetary discs: 1. An analytical perspective to stratification
S. Rendon Restrepo, U. Ziegler, M. Villenave +1
Context. In Class 0/I and the outskirts of Class II circumstellar discs, the self-gravity of gas significantly affects the disc's vertical hydrostatic equilibrium. The contribution…
Toward an efficient second-order method for computing the surface gravitational potential on spherical-polar meshes
Oliver Gressel, Udo Ziegler
Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self-gravity. In the context of circumstellar discs, thi…
Global hydromagnetic simulations of a planet embedded in a dead zone: gap opening, gas accretion and formation of a protoplanetary jet
Oliver Gressel, Richard P. Nelson, Neal J. Turner +1
We present global hydrodynamic and magnetohydrodynamic (MHD) simulations with mesh refinement of accreting planets embedded in protoplanetary disks (PPDs). The magnetized disk incl…