Automatic Stabilization 5

[sepehrdara]

Hi everyone,

I am using a constant damping factor for the Automatic Stabilization and it works well in converging my analysis.
As I increase the damping factor (the default value is 0.0002) it even works better.
I wonder what is the damping factor doing and how much I can increase or decrease it from the default value.

Thanks,
Sep

 

[portliner]

It creates a non-real viscous stiffness to avoid zero stiffness. The more you increas the factor the more stiffness and better convergence but less realistic solution.

 

[rstupplebeen]

The damping is ramped down to 0 at the end of the solution step but could cause inaccurate results is some cases. Typically I check the energies of the solution to see if the energies associated with the damping is deemed significant compared to the total energy for my case. You can also do s sensitivity to see if changing the value has a significant effect on the results of interest. I hope this helps.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[burningDiesel]

From my experience, be carefull in using it. Always check with a solution without it, or, if you can't get it to converge without, keep reducing the value and see if you have any convergence in that. Using the energy is a good point, but depending on the problem you can get a large influence, even if the energy is small.

 

[sepehrdara]

thank you guys for your helpful comments.