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

LIGGGHTS 1.3.1 (released 15 June 2011)

Fixed a typo bug in the fix wall gran command

LIGGGHTS 1.3 (released 14 June 2011)

New major pack of updates

Multiple updates to the fix mesh/gran command:
1) Speed up in the mesh import routine, is now ~factor 10 faster for large meshes
2) Added a new rotation option to mesh gran. Thanks to Evan Smuts (U Cape Town) for submitting this
3) Fixed a tolerance issue for calculating the damping force calculation in case of moving mesh
4) Now triangle meshes also be imported from (legacy) ASCII VTK files.

Further updates and bug fixes:

+ new force model for virtual mass force (not tested!)
+ new environment variables in .../etc/bashrc
+ bugfixes

CFDEM coupling version 2.0.1 beta (released Mai 18, 2011)
+ modifications to allow for varying number of particles in domain (insertion and deletion at runtime)
+ bugfixes

LIGGGHTS 1.2.9 (released 26 April 2011)

+ Added a new fix transportequation/scalar that solves general particle-based transport equations, generalizing the code from the heat transfer model
+ Some improvements to heat transfer model resulting in simulation speed-up for dilute cases
+ Initial commit of the LIGGGHTS part for a convective heat transfer model in the frame of the CFD-DEM coupling, CFD part to come over the next weeks
+ Improved CFD-DEM coupling so that now particles can be inserted/deleted during a coupled run ("consecutive tags" error).

CFDEM coupling version 2.0 beta (released April 6, 2011) - UPDATE

+ update to allow for LES and RAS turbulence modeling
(example case is settlingTestMPI, changes necessary in /CFD/constant/couplingProperties
and in /CFD/constant/turbulenceProperties)
+ Note: this feature needs testing and validation!

CFDEM coupling version 2.0 beta (released April 6, 2011)
UPGRADE FROM 1.0 beta RECOMMENDED

+ the CFD-DEM coupling is now based on MPI communication ... coupling is now parallel (!!!)
+ improved stability of the solver, it now handles momentum exchange terms implicitly
+ additional test case (ErgunTestMPI) showing the simulation of a densely packed bed
+ numerous bug fixes
+ GIT repository has changed (see download section)
+ the latest Version of LIGGGHTS necessary (1.2.8 or newer)

We have an open PhD position for LIGGGHTS development/application.
More infos here: PhD position at JKU

Christoph

LIGGGHTS 1.2.8 (released 06 April 2011)

Test harness results vs. 1.2.4 can be seen here.

+ Initial release of the MPI datacoupling module for LIGGGHTS side the CFD-DEM coupling. MPI coupling module soon to be released on the CFD side. So stay tuned... Thanks to Christoph Goniva and Alice Hager (both JKU) for all the cooperation on the subject!

LIGGGHTS 1.2.7 (released 22 March 2011)
UPGRADE FROM 1.2.6 RECOMMENDED

+ Fixed a bug related to triangular wall neighborlist. This bug unfortunately came in when fixing a small issue.
For all users of triangular walls it is heavily recommended to update to 1.2.7!
+ Improved accuracy of the triangle wall representation in case the triangle area is smaller than particle size.
Now the contact forces are scaled down with the ratio of triangle size to the theoretical contact area size based on the overlap