When solving static or quasi-static type problems, the default Implicit Static solver (IMAS=0 in CONTROL_IMPLICIT_DYNAMICS) requires a well-conditioned model, with no rigidbody modes, to get good convergence behavior. It is often difficult to prevent rigidbody modes especially when its dependent on contact-impact conditions. In such cases, use of Implicit Dynamics solver (IMAS=1) can help [...]
Archive for October, 2006
Implicit Dynamics - Now with Birth, Death, and Burial Properties
Published by October 3rd, 2006 in LS-DYNA Bytes and LS-DYNA Implicit. 0 CommentsOverview of Mass-Scaling in LS-DYNA
Published by October 2nd, 2006 in LS-DYNA Bytes and LS-DYNA Elements. 16 CommentsMass-scaling is a term that is used for the process of scaling the element’s mass in explicit simulations to adjust its timestep. The primary motivation is to change (usually increase) the global compute timestep which is limited by the Courant’s stability criteria. LS-DYNA allows two different types of mass-scaling using the DT2MS parameter from [...]
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