Engine Keyword Generates the SPH cells time step control type.



Δ T sca Δ T min


Field Contents SI Unit Example
Keyword3 Time step control type:
The SPH cell which is controlling the time step is removed so that the constant time step, Δ T min can be maintained.
The run will stop, if the SPH cells time step reaches Δ T min and a restart file will be written.
The computation is killed, if the SPH cells time step reaches Δ T min

If Keyword3 is not specified, that is, /DT/SPHCEL, then the shell elements will use the Δ T min is not used.

Δ T sca Scale factor on time step for option SPHCEL.  
Δ T min Minimum time step for option SPHCEL.  


  1. This option can be used with the /DT/NODA. In such case, the criteria for deleting a SPH cell (or stopping, or killing the computation) is:
    Δ T sca 2 m K * Δ t min

    with K * MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba Gaam4samaaCaaaleqabaGaaiOkaaaaaaa@3B81@ being the stiffness based on SPH interaction.

  2. Nodal time step is generally more robust.