Hello,
I am running a dynamic analysis model in Plaxis to find a vertical displacement of the pipeline in liquefiable soil, but it takes one day and is still running in 11.21 seconds. Is it normal for this kind of analysis in Plaxis? If so, anyone could know how to reduce the time of run?In this model:The time step= 0.02Dynamic boundary condition: Tied degrees of freedomConstitutive model: PM4SandMesh: FineBest regards,Sanaz
Hi Sanaz,
It is not easy to say since it also depends on the capability of a computer, number of elements, calculation settings, etc. Generally, if too many elements or time step is too small, it will take longer time.
The time step is quite important for the dynamic calculation, you may check it in the link below:
Time step used in dynamic calculation
Hi Hung,
Thank you for your helpful information. I changed the time step from 0.02 to 0.06 sec and got a run of my model. Since then, the calculation has stuck in 11.28 s. currently, it has been four days, and it is still running without changing the dynamic time.
I think if the simulation is stuck for an extended period, there could be a reason behind this issue but I do not know how to find this issue.
In addition, In dynamic analysis, the excess pore water pressure should ideally change. When I clicked on the prereview bottom before completing the analysis result and checked the excess pore-pressure development plot, I noticed the pore-water pressure did not generate.
Best regards,
Sanaz
Hello Sanaz,
I am afraid that we cannot easily understand what might not work as expected via the Forum.
In order to be able to assist you with your project and identify the reason for the problem you experience, please open a new Case for support. Then, one of our support engineers can help you in detail: https://bentleysystems.service-now.com/csp
Hello Stefanos,Thank you. Currently, I have fixed the problem. I reduced the elements to 6 nodes, and then the model worked.In addition, for the case of the Excess Pore Water Pressure (EPWP), I changed the drainage type to "undrained A", and then EPWP was generated.