Tutorial OS-T 1600
Altair EmployeeHello,
i tried to solve the Optistruct OS-T 1600 Tutorial, but after starting the two solvers (optistruct, acusolve) there is a convergence error of acusolve that stops the job:
Messages for the job:
*** ERROR # 5202 ***
Acusolve stops before FSI iteration achieves convergence.
*** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.
Does anyone knows the problem? I checked all steps of the tutorial and start it again, but the error still appears.
The next step was to change the exchange parameter of acusolve (min/max_stagger_iterations) and optistruct (min/maxEX) to 30. A Simulation of the Tutorial with only 0.02s worked.
To simulate the tutorial 0.1s or the whole 1s - as it is described in the Tutorial- still doesn´t work with a value of 100 for max_stagger and MAXEX. Another error appeared:
<?xml version="1.0" encoding="UTF-8"?>
Does anyone has got experience with the tutorial OS-T 1600 and solved it successfull?
Thank you very much in advance.
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Hi
Do you mean the following tutorial? Its fem file is in attachment.
In my model, since the supports are not symmetric, there is no symmetry in the whole model. Therefore I have to model whole cylinder. Furthermore, there is no gasket so there are no contact surfaces.
Follow the same process shown in tutorial, but don't add PARAM>>LGDISP and in load case refer NLPARAM card in just NLPARM AND NOT TO NLPARM(LGDISP)
Could you please set up attached fem file according to your suggestions above?
Thank you.
The model is already good to go. I have increased the NINC in NLPARAM
Can NL_DTRANS.fem be used for small displacement, as well? I need a dynamic implicit simulation for a cylinder under cyclic internal pressure. According to the physics of my model, there is no large displacement in the cylinder. However it can have nonlinearity in material which is steel.
Thank you.
Hi Prakash
Even by using Simple Averaging method, still there is no smooth contour. What is the possible source of this problem and how to manage it, please? It happens when a model has high number of elements and specially in transient simulation that needs to do high number of iterations.
By the way, is there any news about the FSI tutorials error, please?
Thank you.
Hi,
I don't have access to tutorials right now. But you can search in form for information and examples on small displacement analysis
This is one tutorial I remember for NLSTAT small displacement analysis... OS-T: 1360 NLSTAT Analysis of Gasket Materials in Contact