Dear colleagues,
I am working with FLAC (dynamic analysis using PM4Sand) and I would like to ensure that the static stage of my model is already stable before applying the dynamic loading.
In my case, I noticed that the ru (excess pore pressure ratio) shows irregular behavior at the beginning of the dynamic stage: it fluctuates unnaturally and even jumps close to 0.9 at around t = 1 s, which does not look physical.
To address this, I already tried to control the initial static condition by adjusting K₀, but the result is still the same.
My question is: How can we check or confirm that the static model is already stable in FLAC/FLAC3D?
Is it sufficient to look at the unbalanced force ratio, or should we also check other criteria such as displacement trend, kinetic energy, or stress distribution?
Any suggestions or references would be greatly appreciated.
Thank you!
Hi
Please ''set large on''
If your model is unstable the cycling will stop with set large running.
Codially,
Alireza
Alireza Rashiddel Thank you very much for the response. Thank you for your answer. What I mean is that in my simulations, I often observe that the ru value is jumping close to 1 at the very beginning, and I was questioning myself whether this happens because my static model has not been fully stabilized yet. That is why I would like to know how to ensure that the model is truly stable. I have already applied set large on.
Do you have any suggestions on this issue, or is it something that is normally expected in such simulations?
Best regards
Ela
Hello Ela Elviani
I think you have some mistakes in the Hydro-Dynamic Interaction Process Simulation.
Best regards,
Alireza
Hi Alireza Rashiddel
Thank you so much for your responses. It's very helpful for me.
Best regards,
Ela
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