Mass scaling not working?

[liq001]

Hey guys,

I have a quick question about mass scaling. In my current model I have applied semi-automatic mass scaling to a target time increment to 8e-7. However, looks like it's not working at all at where the time increment start to decrease. As you can see the attached image, the percentage of adding mass is 0 all the time. Need your input for this. Thanks so much.

*Step, name=Filling, nlgeom=YES
**Dynamic, Explicit, direct user control
*Dynamic, Explicit
, 0.25
*Variable Mass Scaling, dt=8.0e-7, type=BELOW MIN, FREQUENCY=1000
*Bulk Viscosity
0.06, 1.2

 

[liq001]

here is the image

 

[liq001]

Any idea of this?

 

[FEA way]

Did you try with a different frequency (so that it's done more often than once in 1000 increments) ? Also, there are multiple output variables that can be requested to check mass scaling.

 

[liq001]

@FEA_way. I have try frequency=1, it's perform the same as above. could you please let me know what else I can check for?

 

[FEA way]

Check the warning messages and contents of logs in general, maybe there will be some indication. Try simplifying the model, especially if it contains any unusual features (mass scaling may not support them - of course, the limitations are listed in the documentation).