What is the meaning of this data in output file for Nonlinear transient analysis?

gslee
gslee New Altair Community Member
edited October 2020 in Community Q&A

Hi,

 

I want to know the meaning of the data in output file for nonlinear transient analysis.

image.png.a0a403a209e2d8f7eca03f94c36d7be3.png

 

What is the meaning of ' itstp', 'norm(da)', 'noram(u_ref)', 'err_da', 'adjustment'?

 

'err_da' is error for what?

 

'itstp' is iteration step? then what is the difference between 'itstp' and 'Iter' ?

 

'Cutback' means that iteration does not satisfy the convergence criteria?

 

So increment load is changed?

image.png.bb8dcf422e9c12c0bc49f95854b08b70.png

 

 

image.png.bcae90a79e0a7cfb032ca064177bee14.png

In this, what is the meaning of 'Reduce next'??

what should be reduced next?

 

 

image.png.a62b920075854525cd90be9826e3cef1.png

In this, what is the meaning of 'No change' ??

What should be not changed?

 

image.png.0220d854f610a9c11ba96ab09a138c0a.png

In this, what is the meaning of 'Enlarge next' ??

What should be enlarged?

 

Thanks

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