Andreas Koutras
Ansys Employee
Hi Niklas,nThe official reference is the LS-DYNA manual. The dynasupport website contains useful information but is operated by DYNAmore, which is a different company. Still, both sources refer to the same central difference method. Equations (1) and (2) in dynasupport are the same as equations 27.9 and 27.8 of the manual respectfully, if you replace x by u. As stated in the manual, although storing the displacement vector requires more memory, the results become less sensitive to round-off error. You can find a detailed description of the central difference method for time integration in the textbook Nonlinear finite elements for continua and structures by T. Belytschko.nBest regardsnn