Limitations (may coexist, but out of the selected AMS part group)

• SPH: AMS does not increase time step of SPH (example: tank sloshing in crash)
• ALE - Euler - FVM: formulations are not supported (but can be put out of /AMS part, if time step is decent)
• 2D analysis: /AMS is not available
• Parts involving:
  • Lagrange multipliers: /MPC and /GJOINT
  • /FXBODY

In such cases, a warning is output by Radioss Engine and the computation may even diverge.

• Elements:
  • 4-node tetra: /TETRA4 with I_tetra=1 or 3
  • 16-node shell: /SHEL16
  • 20-node bricks: /BRIC20

In such cases, the computation will most likely diverge.

• Rigid bodies cannot be activated and deactivated with sensors
• Interfaces: /DT/INTER/CST is not compatible with /DT/AMS
  • Nodes that are secondary of both: a tied interface TYPE2 and a contact interface (TYPE7 or TYPE11) will have their contact stiffness removed a Starter message in the 0.out file is then issued:

    ** WARNING SECONDARY NODE OF AN INTERFACE TYPE2 & AMS
      INTERFACE TYPE[7 or 11], ID=xxxxxx:
      SECONDARY NODE ID=yyyyyyy IS ALSO SECONDARY NODE OF AN INTERFACE TYPE2
     THE NODE CONTACT STIFFNESS WILL BE DE-ACTIVATED CASE OF /DT/AMS

    This contact deactivation can be avoided by using Spot_flag=25, 27 or 28 (TYPE2 penalty formulation).

  • Kinematic formulation (TYPE2) for spotwelds may alter AMS performances when there are many spotwelds, particularly hexa spotwelds.
• Airbags with reference metrics: /REFSTA or /XREF do not benefit AMS speedup.
• Refer to the Starter Input and Engine Input Reference Guides.