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Can someone please help me out as to why the error % keeps increasing throughout the run. The node no. 30657 is the one where the error is.
Thank you
Unable to find an attachment - read this blog
Hi,
there are intersections in the 'self dummy' contact- all intersections and penetrations should be removed before running the model.
Check and remove manually or automatically any initial intersections and penetration in your model by using Tool>> Penetration or in Hypercrash by Quality>>Check all solver interfaces. Please go through HM-3320: Penetration tutorial in Help Menu which shows fixing penetrations.
New Feature in HW 2017 - Collision Detection Tool - Altair University
Try to run the attached solver deck. There are some other modeling issues remaining.
Thank you for your response. I ran the model without any intersections or penetrations. It gave me a normal termination but the error % still keeps increasing.
Can you explain why is this happening?
Negative Energy Error is dissipated from the system with:
-plastic deformation
-hourglass energy
-contact with friction
-contact intersection & penetration
Open the run_nameT01 time history file in Hypergraph and plot the Global variable>Internal, Kinetic, Contact, Hourglass, Total energy.
See attached documents for details (from Introduction to Explicit Analysis using RADIOSS – A Study Guide)
So is this normal or should I change something?
Negative energy can be reduced:
-Ishell=12 or 24 (hourglass control on property card)
-Ifric=0 (no contact friction)
It gives me an error of Mass error Limit reached.
205000 0.1025 0.5000E-06 NODE 30658 99.9% 3867. 0.1269E+06 0.2799E+05 -0.1302E+05 71.74 ANIMATION FILE: seatbelt_negative_energyA207 WRITTEN 206000 0.1030 0.5000E-06 NODE 30658 99.9% 3967. 0.1269E+06 0.2797E+05 -0.1297E+05 71.74 ANIMATION FILE: seatbelt_negative_energyA208 WRITTEN 207000 0.1035 0.5003E-06 NODE 31463 99.9% 4056. 0.1269E+06 0.2795E+05 -0.1292E+05 71.74 ANIMATION FILE: seatbelt_negative_energyA209 WRITTEN 208000 0.1040 0.5001E-06 NODE 31463 99.9% 4148. 0.1268E+06 0.2793E+05 -0.1287E+05 71.74 WARNING INTERFACE 10 NODE 21756 DE-ACTIVATED FROM INTERFACE
MESSAGE ID : 207
** RUN KILLED : TOTAL MASS ERROR LIMIT REACHED
If the last column is MAS.ERR then probably too high timestep is imposed. There is possibly deep contact penetration on node 21756 (dummy chest). Review the animation at time 0.1 to identify the issue.
3_Timestep - Altair
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