/DT/Eltyp/Iflag

Engine Keyword Time step for select entities.

Format

/DT/Eltyp/Iflag

$Δ T_{s c a}$ $Δ T_{\min}$

grnd_ID

Definitions

Data	Description	SI Unit Example
`Eltyp`	Entity selection: `BRICK` Brick elements `QUAD` Quad elements `SHELL` Shell elements `SH_3N` Triangular shell elements `TRUSS` Truss elements `BEAM` Beam elements `SPRING` Spring elements `AIRBAG` Airbag `FVMBAG` Finite Volume Method airbag for monitored volumes type /FVMBAG or /FVMBAG1 only. /DT/FVMBAG means that if dt<dtmin and volume < 10 * the minimum volume used for global merge the finite volume is merged. This is the strategy used in version 12.0.223. The $Δ T_{s c a}$ and $Δ T_{\min}$ can be defined to insure stability and a minimum time step size by triggering additional finite volume merges when the FVMBAG entity penalizes the computation. /DT/FVMBAG/1 means that if dt<dtmin the finite volume is merged. `INTER` Interface (TYPE7 only). Only concerns interface TYPE7 time step. `NODA` Nodes Activates nodal time step computation. With this option, the computation of each cycle is slightly more expensive, but the time step can be higher, mainly for non-optimized meshes.
`Iflag`	Node group flag 1
$Δ T_{s c a}$	Scale factor on time step for the option defined by `Eltyp`.
$Δ T_{\min}$	Minimum time step for the option defined by `Eltyp`. 2
`grnd_ID`	Node group identifier. Read only if `Eltyp` is `NODA` and `Iflag` =1.

Comments

The Iflag can be only used with Eltyp=NODA.
- If Iflag =1, only the nodes belonging the node group grnd_ID are affected.
- If Iflag =0, all nodes are affected.
If Eltyp is BEAM, TRUSS, SPRING, NODA or INTER, the value of $Δ T_{\min}$ has no effect.