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Ludwig 0.21.0
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@kevinstratford kevinstratford released this 10 Jan 19:11
· 88 commits to master since this release
ludwig-0.21.0
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Learn about vigilant mode.

Release 0.21.0 (9th January 2024)

  • Ellipsoids. A feature which allows ellipsoidal particles to be
    used has been added by Sumesh Thampi.

  • "colloid_type" has been split into a number of more general
    properties including: boundary condition (bc) either bbl or
    subgrid; shale either "disk", "sphere", or "ellipsoid";
    active (logical); magnetic (logical).
    The default is: bc = bbl, shape = sphere, active = no, magnetic = no.
    There are some conditions, e.g., "disk" expects a 2D D2Q9 model.
    This affects the way colloid details are specified in the input.
    Older colloid state files should still work.
    See https://ludwig.epcc.ed.ac.uk

  • There is no longer an option available for field halo swaps; the
    scheme has been consolidated is always the same (for CPU). GPU
    run time configuration is pending. Halo information is still
    available https://ludwig.epcc.ed.ac.uk/inputs/parallel.html

  • If you use a 2-dimensional system (L_z = 1) with an order parameter, you
    must use a 2d gradient calculation. This is related to the (non-) treatment
    of halo swaps in the third dimension for fields.

  • A colloid_buoyancy option has been added which is similar to
    colloid_gravity but computes a force proportional to colloid volume.
    See https://ludwig.epcc.ed.ac.uk/inputs/colloid.html#external-forces

Bug fixes:

  • Issue 270: a colloid with an initial position placed exactly at a sub-domain
    boundary can fail to be attached to the cell list in some
    circumstances causing a crash. This has been fixed by adding
    a small position adjustment, or if this doesn't work, failing
    with a message.
  • Issue 268: if using wetting information read from porous media files,
    the form of the key words in the input file has been
    adjusted. See https://ludwig.epcc.ed.ac.uk/inputs/porous.html
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