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# NSW

From Vaspwiki

**NSW** = [integer]

Default: **NSW** = 0

Description: **NSW** sets the maximum number of ionic steps.

IBRION = 0:

**NSW**gives the number of steps in all ab-initio Molecular Dynamics runs, it*has*to be supplied therefore, otherwise VASP crashes immediately after having started.

IBRION != 0:

- In all minimization algorithms (quasi-Newton, conjugate gradient, and damped molecular dynamics)
**NSW**defines the maximum number of ionic steps.

**Mind**: Within each ionic step at most NELM electronic-SC loops are performed unless the EDIFF convergence criterium is matched before. Exact Hellmann-Feynman forces and stresses are calculated for each ionic step.