LIGGGHTS 1.1.1 (released 30. June 2010)
BACKWARD COMPATIBILITY:
You will be able to use restart files from 1.1
You may not be able to use restart files from versions older than 1.1
Version 1.1.1 changes the way the effective Shear modulus for two particles in contact (G*) is calculated. See doc/pair_gran.html for details on the formula.
The old calculation was based on Chemical Engineering Science 59 (2004) 525 – 541, whereas 1.1.1 uses the calculation as given in Comput. Methods Appl. Mech. Engrg. 197 (2007) 80–94.
Tests indicate that the second version is more suitable. Many thanks to Diego Peinado (Intrame AS) for discussing this detail!