CFDEM®coupling, LIGGGHTS® and ParScale - Announcements from the developers

LIGGGHTS 1.5.2 accidentally identified itself as LIGGGHTS 1.5.3 - fixed as of 20 March

Christoph

LIGGGHTS 1.5.2 (released 13 March 2012)
CFDEM COMPATBILITY: 1.5.2 is currently not able to couple to CFDEM
+ Fixed two issues in the rolling friction model. Thanks to Matt Roesler (ETH Zürich) for detecting the issues in the code and to Prof. Jin Ooi (U Edinburgh) and Matt Roesler for a very helpful discussion discussion.
+ Fixed a bug in the 'region cone' command. Thanks to Maria Angelova (TUHH) for bringing this up and to Andreas Aigner (JKU) for tracking down the bug.

See here: node/15

LIGGGHTS 1.5.1 (released 2 Feb 2012)
CFDEM COMPATBILITY: 1.5.1 is currently not able to couple to CFDEM

+ Fixed a bug with the "riggle" for fix move/mesh/gran. Thanks to Niels Dallinger (TU Chemnitz) for noting this.
+ Fixed a bug in region block when used as wall. Thanks to Andreas Aigner (JKU) for debugging and to Moritz Höfert (BASF) for a script that showed the problem.
+ Fixed an inconsistency where the set command for property/atom had no effect when issued right after the fix. Thanks to Claudio Wolfer (NTB Buchs) for flagging this problem.

LIGGGHTS 1.5 is now the latest mature version in the liggghts git repo
1.5.1 to be relaesed shortly via the liggghtsdev git repo

C# SPH Simulator by David Schellander (JKU) for teaching/testing/playing around :-)

In a C# project David Schellander (JKU) developed a simple 2D SPH Simulator. This simple code can be used for testing own models in SPH or just for first experiments with the method of smoothed particle hydrdynamics. A more stable and more realistic 3D SPH model is already implemented and included in LIGGGHTS. This should be used for 3D simulations, because the C# code can also handle only just a few thousand particles.

Syntax highlighting for the Gnome text editor gedit is now available. It can be found here.

Feedback is appreciated, so give it a try and tell us your opinions and experiences.

On behalf of the CFDEM project team I would like to wish you happy holidays,
and a successful new year 2012!

status: Update recommended!

changes and new features:

+ in "couplingProperties" the model type must be specified, see Zhou et al. (2010): "Discrete particle simulation of particle-fluid flow: model formulations and their appliccability", JFM
+ modified ErgunTestMPI, now showing min. fluidization velocity test
+ testcase now operate at rho != 1, to prevent from rho related bugs
+ changes in averagingModel (UsNext/Prev no longer have to be specified)
+ changes in implicitCouple (KslNext/Prev no longer have to be specified)

LIGGGHTS 1.5 (released 30 November 2011)

New features:
+ Added a new (simple) model for particle breakage via command fix breakparticle/force with new example 'breakage'. Doc for the command to come in the next release

Updates to the insertion commands:
+ Re-work for fix insert/pack, see doc for details
+ New insertion command fix insert/rate/region
+ New keywords "start" for fix insert/pack, fix insert/stream and fix insert/rate/region and new keyword 'duration' fix insert/stream.