Parallel Analysis of a coupled problem

[mehrangh2016]

Dear Sir,

I am new to the parallel version of FEAP. I have tried to solve a coupled problem in a parallel manner but when I started the analysis this massage appeared on terminal window:

"NO CONVERGENCE REASON:  Iterations exceeded"   

My sample is a 2D plate with a notch in the middle part of the plate, I used th TIE command. In this case the about massage appeared. When I commented out the TIE command. The analysis started but the results were not correct.

How can I solve this problem. I tested also OPTI command but it did not word for me.

Thanks for your attention.

Mehran 

[Prof. S. Govindjee]

Parallel FEAP does not work with the PART command for splitting couple field problems (at least in the version we distribute).  I believe that one of the research groups at Columbia University has however made this extension.  Perhaps one them can chime in and provide the instructions for making that modification.

The other things to always remember about parallel FEAP is that you first need a flat file before performing the graph partitioning for the parallel input files.  So if you have a TIE command in your mesh, step one is to perform an OUTMesh command to have FEAP make a flat input-file for you.  You can then restart FEAP with this new file and perform your graph partitioning.

[mehrangh2016]

Dear Sir,

The other point that,

does the existence of a single notch in the middle part of the 2d plate affect the parallel analysis? I created the single-notched 2d plate mesh in Abaqus and converted it to the FEAP format and used METIS version for graph partitioning, but the same problem appeared.

Mehran

[FEAP_Admin]

A notch in a plate should work just fine.  The thing that does not work in parallel FEAP is the use of operator splitting.

[mehrangh2016]

Thanks for your recommendations, I finally solved my problem, now I can easily execute the input file includes TIE command.

Best Regards,