Systems

Systems

error: stopped routine SYNP_CHKCONV_SC

    • Djoumessi
      Subscriber
      Hi everyone.nI'm working on an FSI model where I couple the CFX-Transient structural while using a system coupling. but after 200 iterations, I get this error:n (DP 0) Participant Solution encountered a fatal error. Message: Stopped in routine SYNP_CHKCONV_SC Please do not save the project if you would like to recover to the last saved state.nbut what surprises me is that the model converges very well to the iteration before the 200 iterations. i tried everything I get the same error.nIs it because I'm using the student version? nPlease can someone help me? I've been looking for this error a lot on the net but without success. Thank you in advance. nn
    • Stephen Orlando
      Ansys Employee
      Hi,nWhen running System Coupling and it stops running, the first thing to do is examine the output files for each solver to look for clues to what happened. For CFX, look at the .out file. For Mechanical, look at the .out file. Also, look at the System Coupling log file, .scl. We have seen this SYNP_CHKCONV_SC message come up before when the mapping isn't very good. So check the mapping summary in the .scl, then check the geometry to see if changes need to be made. nIt is very important to build up the FSI simulation in stages as opposed to setting up the 2-way FSI right at the start. This document Best Practices for Coupled Fluid-Structure Interaction (FSI) describes this process and is available here:https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/sysc_ug/sysc_bestpractices_fsi.htmlnI recommend going over this tutorial in the Ansys documentation that shows a 2-way FSI simulation with CFX and Mechanical.https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/sysc_tut/sysc_tut_oscplate_wb_cfx.htmlnYou can also look at the following for the same tutorial but run with the System Coupling GUI or Command Line Interface that is run outside of Workbench:https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/sysc_tut/sysc_tut_oscplate_cli_cfx.htmlnFSI simulations with very soft materials or membranes are prone to numerical instabilities. In 2020R1 we have introduced a stabilization method in System Coupling called the Quasi-Newton Stabilization Algorithm. Note that this has to be used with the new System Coupling GUI or Command Line Interface that is run outside of Workbench. More information here:https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/sysc_ug/sysc_gen_scservice_dt_supplemental_iqnils.htmlnSteven
    • Djoumessi
      Subscriber
      Hello Steve,nthank you very much for your intervention, I will work on it and let you know the results.nthanks againnDjoumessi.n
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