The Siemens Community Catalyst program was co-created with our community to acknowledge technology leaders who consistently contribute to the Siemens Community. Nominations are accepted on a rolling basis.
Dear All,
Any tutorial for Geometric non-linear Implicit Dynamics analysis???
Thanks
RAM
OS-1500: Nonlinear Implicit Analysis of Bending of a Plate
Hi Ram,
Please go through these case studies: http://www.altairatc.com/india/bangalore/technical-presentations.htm
Dear George,
I had tried to solve my problem using Geometric non-linear Implicit Dynamics analysis .
Total run time is for 21 seconds but it is solving for 15 seconds then shows the below error.
Following error occurs after some iterations.
MESSAGE ID : 79
** ERROR : RADIOSS IMPLICIT STOPPED DUE TO TIMESTEP LIMIT **
ISTOP=-2
Please provide your guidelines.
When the time step is smaller than the input minimum one (please check /IMPL/DT/STOP), RADIOSS will stop the run with this message.
The reason is generally due to the convergence issue (DT_min). There is no general workaround for convergence issue, as outlined below:
1.Check the model, constraint conditions, materials, contact interface defines and so on.
2.Switching other convergence criteria (see Itol in /IMPL/NONLIN).
3.Try /IMPL/NONL/SMDISP to see if the issue came from geometric nonlinear
After reducing the minimum timestep DT in TSTEPNL ,
i didn't get this error.
But it shows this error
Please provide your guidelines
Below are the suggested workarounds for error ISTOP=-4:
1.Check which solve method is used in /IMPL/SOLVER. Use another solve method.
2.Another frequent case is when the model is relatively large and the available free disk is not large enough. If the issue came from memory management, you could also force RADIOSS to use out-of-core resolution (/IMPL/SBCS/OUTCORE).
Please try with these options.
How to change the solver method?
I presume that you are working on OptiStruct Profile.
Create a load collector with SOLVTYP as card image and Create/Edit it. You will get the options to change the solver type. Try with AUTO which automatically selects between BCS and PCG type.
Finally, edit the load step and recall the SOLVTYP you have created.
<?xml version="1.0" encoding="UTF-8"?>
Yes ,i am using Optistruct and created the load collector with SOLVTYP card as you mentioned.
I am choose analysis type as Geometric Nonlinear Implicit dynamic analysis in Solver Definition in load step
In SUBCASE option ,the SOLVTYP is not available and unable to recall it.
please give your valuable suggestions
Ill update you regarding this.
It is not possible to change the solver type for dynamic cases.
Please share the .out file.
Shared files in your dropbox
Please find the image attached for the results getting from my side.
Join us for a community conversation on how High-Performance Computing (HPC) and Simcenter PSIM work together to meet the increasing demands of modern power electronics simulation. During this one-hour technical session, you'll discover how leveraging HPC can speed up simulations, improve scalability, and empower engineers…
Join us for a community conversation on accelerating your motor simulation workflow with Simcenter Simlab. In this beginner-friendly session, we'll introduce the platform's automated model-building capabilities and show how easy it is to set up your first electric motor analysis. You'll see the basic steps of geometry…
Join us for a Community Conversation where we'll discuss practical approaches to analyzing complex electromagnetic models using hybrid solver techniques. This session will provide a general overview of how different computational methods can be combined within a single simulation to address models containing varied…
