Energy & Mass error

Karthic_22061

Hi,

I am trying a snap fit in radioss,

I am facing the issue  ' RUN KILLED : ENERGY ERROR LIMIT REACHED' and  'RUN KILLED : TOTAL MASS ERROR LIMIT REACHED'.

I checked for the Energy plot  , I found steep rise in K.E just before termination.

 

Please guide me to resolve it.

out files attached for reference

 

Thank you

 N.K
 

 

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Simon Križnik

Hi Karthic,

 

this error is common with inapropriate mass scaling, that is when you impose a time step which is too high. Check the mass error due to mass scaling in the .out file: in your model the mass scaling increases the system's mass by 57x. It is suggested to keep the overall mass increase bellow 2% and even then it has to be checked if mass is added to parts that are moving, which would increase the kinetic energy and therefore decrease the simulation accuracy. Short video for energy and timestep error

https://altair-2.wistia.com/medias/osd349gz4k

 



 

Alternatively you could try with advanced mass scaling (AMS) which does not add mass.

 

You can find more information from Introduction to Explicit Analysis using RADIOSS – A Study Guide in Time Step Control chapter. Also recommended is 2017 Radioss user guide starting from page 30.

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