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

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LIGGGHTS 1.1.8 released

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Submitted by ckloss on Wed, 10/06/2010 - 09:56

LIGGGHTS 1.1.8 (released 6. October 2010)

1) Added an important update to the CAD wall handling improving the correctness of particle-wall damping for edge and corner contacts. Many thanks to Chris Stoltz (Procter & Gamble USA) for the helpful testcases and discussions
2) Fixed a general issue with fixes defined after previous runs where some properties were not correctly initialized. Thanks to Carsten Schilde (TU Braunschweig) for running into this problem

New "Known issues" page

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Submitted by ckloss on Wed, 09/29/2010 - 08:56

To make it transparent to users which LIGGGHTS issues are known to exist and which issues will be fixed in upcoming versions, the known issues are listed here.

As a new version is released, the fixed issues will vanish from there and appear in the version history as fixed issues.

New Git capability for LIGGGHTS

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Submitted by ckloss on Mon, 09/20/2010 - 09:41

In order to make things more convenient for you, a git repository has been established for LIGGGHTS.
This enables you to keep your version of LIGGGHTS up-to-date without having to download a new tarball every time a new version is released.

For details on how to use this git repository, see the LIGGGHTS download section here.

LIGGGHTS 1.1.7 released

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Submitted by ckloss on Fri, 09/17/2010 - 17:51

LIGGGHTS 1.1.7 (released 17. September 2010)

1) Fixed a LAMMPS bug where processor communication was not correct when using fix adapt under certain circumstances. Thanks to Steve Plimpton (Sandia) for providing a solution to this
2) Fixed a typo in calculating the particle contact area - this impacts on both the heat transfer and the cohesion model
3) George Marketos (Imperial) added a feature to add omega as a variable, as can be done with x,v,etc. Thanks for submitting this.
4) Fixed a bug where shear wall stress was incorrectly dumped to VTK

Minor update for granular pizza.py

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Submitted by ckloss on Tue, 08/17/2010 - 16:18

A little patch has been added to granular pizza.py - the current version available for download is now gran_pizza_17Aug10.
Automatic unscaling for the dump command was removed as it turned out that this is not convenient for granular simulations, especially for scripting.

BACKWARD COMPATIBILITY:
If you have scripts that worked with former version of pizza.py, you should remove all commands like "d.scale()" from these scripts if their purpose was to undo automatic unscaling

LIGGGHTS Quality Assurance

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Submitted by ckloss on Wed, 08/11/2010 - 14:16

Quality assurance

Quality assurance is an important part of software development, irrespective of if this development happens within a software company or by a community-driven effort.

As of version 1.1.6 a quality assurance check will be done by automatically running examples comparing the answers that different version of the LIGGGHTS software give - this is called a test loop.
"Answers" are defined by means of various thermo outputs (e.g. energy) over time that are generated by a run.

A transparent test loop can aid in

LIGGGHTS 1.1.6 released

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Submitted by ckloss on Wed, 08/11/2010 - 14:15

LIGGGHTS 1.1.6 (released 11. August 2010)

Introducing a couple of book-keeping patches, so the code should be much cleaner now.
A major re-write of the LIGGGHTS granular pair styles to allow for greater implementation flexibility is underway, but please be patient.

Fixed an issue where creating atoms with a restart pending lead to a crash - thanks to Thomas Wagner (TU Freiberg) for the bug report

Invitation for visiting students

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Submitted by ckloss on Fri, 08/06/2010 - 13:42

Dear students,

everyone who has a some basic knowledge and of course interest in C++, Linux and particle simulation is welcome to join the CD Lab on Particulate Flow Modelling at the Johannes Kepler University (JKU) Linz , Austria, for a Master Thesis related to the LIGGGHTS DEM code and/or CFD-DEM coupling. We also have PhD positions open.

LIGGGHTS 1.1.5 released

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Submitted by ckloss on Thu, 07/08/2010 - 17:39

LIGGGHTS 1.1.5 (released 8. July 2010)

The third patch for today, this time 2 minor issues:
Added a warning if the user wants to dump stress on wall, but forgot to use the appropriate fix/mesh/gran/stressanalysis. Also fixed a numerical round-off issue for CAD imported walls that could arise under unlikely conditions.

Thanks to Jean-Francois Jerier (Ecole Polytechnique Fédéral de Lausanne) for reporting these issues

LIGGGHTS 1.1.4 released

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Submitted by ckloss on Thu, 07/08/2010 - 13:47

LIGGGHTS 1.1.4 (released 8. July 2010)

One more patch that ought to be included in 1.1 was unintentionally left out - This patch fixes it.
Sorry for the inconvenience - this version should be clean now.
Thanks to Christian-Andreas Winkler (BASF) for running into this problem

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