Ludwig 0.22.0

Changes

Version 0.22.0 (25th July 2024)

Removal of original "ansi" I/O (Issue 284). The "ansi" parallel i/o has been removed in favour of mpi/io for lattice quantities. This change should be transparent in most cases. Old "ansi" parallel i/o restart files will no longer work if the there was more than one output file per step. See e.g., https://ludwig.epcc.ed.ac.uk/outputs/fluid.html

In a related change, there is a slight change in the way porous media files are read at start time. See, e.g., https://ludwig.epcc.ed.ac.uk/inputs/porous.html

Please use "lb_fluctuations" instead of "isothermal_fluctuations" in the input if you need fluctuations in Navier-Stokes.

A lubrication correction between ellipsoids and plane walls has been added. See https://ludwig.epcc.ed.ac.uk/inputs/walls.html

There has been a change to the config.mk file which involves the way the tests are run: only the LAUNCH_MPIRUN_CMD variable is now used. See https://ludwig.epcc.ed.ac.uk/building/index.html

Various minor code improvements, and improvements in testing.

Ludwig 0.21.0

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

Ludwig 0.20.1

Version 0.20.1

Fix issue 271: missing stub prevents compilation at some compiler optimisation levels.

Ludwig-0.20.0

Version 0.20.0

Release date: July 2023

Changes include:

• IMPORTANT: The input file can no longer be specified as a command
  line argument. It must be called "input" in the current directory.
• The electrokinetics sector has been updated and information is
  available at
  https://ludwig.epcc.ed.ac.uk/tutorials/electrokinetics/electrokinetics.html
• A D3Q27 model is available
• Added coverage via https://about.codecov.io/
• The free energy is now reported at t = 0 for the initial state.
• An extra "first touch" option has been added. For details, see
  https://ludwig.epcc.ed.ac.uk/inputs/parallel.html
• Various minor changes and code quality improvements.

Ludwig 0.19.0

Release data 25th January 2023.

Ludwig 0.18.0

Released 13th September 2022.

Ludwig 0.17.0

Release of 13 July 2022.

• add liquid crystal anchoring fd_gradient_calculation s7_anchoring

  • this is a replacement for 3d_7pt_fluid and does a slightly better
    job at the edges and corners by using a consistent surface normal.
    The anchoring properties are now specifed in a slightly different
    way.

  • For walls, see https://ludwig.epcc.ed.ac.uk/inputs/walls.html

  • For colloids, see https://ludwig.epcc.ed.ac.uk/inputs/colloid.html

  • The existing fd_gradient_calculation 3d_7pt_solid is retained, and
    existing input keys for anchoring will be recognised.

• add option for rectilinear grid format vtk output extract -l

• add option for 2d random nematic lc_q_initialisation random_xy

• A functional AMD GPU version is now available using HIP.

  • See https://ludwig.epcc.ed.ac.uk/building/index.html

• Various minor improvements

Ludwig 0.16.1

A minor fix to the version number and CHANGES.md

Ludwig 0.16.0

Release includes a number of improvements. See CHANGES.md for details.

Ludwig 0.15.0

Release 0.15.0 23 December 2021