Directory:
    ${PENCIL_HOME}/samples/2d-tests/selfgravitating-shearwave
SVN Id:
    $Id$
Maintainer:
    Anders Johansen <anders/astro.lu.se>
    Matthias Rheinhardt <mreinhardt/nordita[dot]org>
    Chao-Chin Yang <ccyang/ua[dot]edu>
Added:
    07-jul-2006
Status:
    succeeds # One of [succeeds|failing since <date>|obsolete| ...]
Recommended resolution:
    None. Varying the resolution is a good test of how many grid points the
    code needs to resolve a self-gravitating shear wave.
References:
    Johansen A., Oishi J., Mac Low M.-M., Klahr H., Henning Th., & Youdin A.:
    2007, ``Rapid planetesimal formation in turbulent circumstellar discs'',
    Nature, vol. 448, p. 1022-1025
Comments:
    Linear test problem for gas self-gravity in the shearing sheet. A leading
    shear wave is swung around by the Keplerian shear and amplified by
    self-gravity.  One can compare the numerical solution to the result of a
    numerical integration of the linearised equation system, produced by the
    IDL script shear_wave.pro (in the idl/ directory).

    [PAB] 25-Mar-2023:
    I fixed an issue the 'fourier_shift_yz_y' routines, where processors were
    calculating something, even though they should not participate in the FFT.
    Not sure if the current output or the old "reference.out" is right.
    Anders, please check.