/IMPL/RREF/OFF

Engine Keyword Deactivation reference residual option and using the previous one in stop criteria for implicit nonlinear analysis.

Format

/IMPL/RREF/OFF

/IMPL/RREF becomes the default option from this version. In this case,
Residual r = $r = f_{e x t} - f_{int} - M a$ $r = f_{e x t} - f_{int} - M a$

${‖ r ‖}_{0} = \max (‖ f_{e x t} ‖, ‖ f_{int} ‖, ‖ M a ‖)$ ${‖ r ‖}_{0} = \max (‖ f_{e x t} ‖, ‖ f_{int} ‖, ‖ M a ‖)$

( $a$ $a$ =0 for static).

When /IMPL/RREF/OFF is used, the previous criteria is used, $‖ r ‖_{0} = ‖ r ‖$ $‖ r ‖_{0} = ‖ r ‖$ at the beginning of each cycle.
This keyword is used only for implicit nonlinear implicit, and is generally more difficult to converge.