{"id":394839,"date":"2024-11-21T17:24:24","date_gmt":"2024-11-21T17:24:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394839\/"},"modified":"2024-11-21T17:24:24","modified_gmt":"2024-11-21T17:24:24","slug":"394839","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394839\/","title":{"rendered":"Reply To: Static Structural Analysis Model Doesn&#8217;t Converge"},"content":{"rendered":"<p>&lt;p&gt;I turned NR residual to 4 and the simulation still crashed, but got much further than it did before. I&#8217;m attaching the solutions branch contact tool here, as well as the last few lines of the solver output file. What&#8217;s the best way to evaluate what&#8217;s causing the convergence issue?&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/21-11-2024-1732209457-contact tool.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/21-11-2024-1732209531-contact tool 2.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;div id=&#8221;paraDiv&#8221;&gt;&lt;p id=&#8221;paragraphData&#8221; class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&nbsp;&nbsp;&nbsp; EQUIL ITER&nbsp; 22 COMPLETED.&nbsp; NEW TRIANG MATRIX.&nbsp; MAX DOF INC=&nbsp; 0.1951E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; DISP CONVERGENCE VALUE&nbsp;&nbsp; =&nbsp; 0.1951E-01&nbsp; CRITERION=&nbsp; 0.7500E-02&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; LINE SEARCH PARAMETER =&nbsp;&nbsp; 1.000&nbsp;&nbsp;&nbsp;&nbsp; SCALED MAX DOF INC =&nbsp; 0.1951E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; FORCE CONVERGENCE VALUE&nbsp; =&nbsp;&nbsp; 1.808&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CRITERION=&nbsp;&nbsp; 4.455&nbsp;&nbsp;&nbsp;&nbsp; &lt;&lt;&lt; CONVERGED&lt;br&gt;&nbsp;&nbsp;&nbsp; Writing NEWTON-RAPHSON residual forces to file: file.nr001&lt;br&gt;&nbsp;&nbsp;&nbsp; EQUIL ITER&nbsp; 23 COMPLETED.&nbsp; NEW TRIANG MATRIX.&nbsp; MAX DOF INC=&nbsp; 0.2220E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; DISP CONVERGENCE VALUE&nbsp;&nbsp; =&nbsp; 0.2220E-01&nbsp; CRITERION=&nbsp; 0.8610E-02&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; LINE SEARCH PARAMETER =&nbsp;&nbsp; 1.000&nbsp;&nbsp;&nbsp;&nbsp; SCALED MAX DOF INC =&nbsp; 0.2220E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; FORCE CONVERGENCE VALUE&nbsp; =&nbsp;&nbsp; 1.954&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CRITERION=&nbsp;&nbsp; 4.546&nbsp;&nbsp;&nbsp;&nbsp; &lt;&lt;&lt; CONVERGED&lt;br&gt;&nbsp;&nbsp;&nbsp; Writing NEWTON-RAPHSON residual forces to file: file.nr002&lt;br&gt;&nbsp;&nbsp;&nbsp; EQUIL ITER&nbsp; 24 COMPLETED.&nbsp; NEW TRIANG MATRIX.&nbsp; MAX DOF INC=&nbsp; 0.2525E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; DISP CONVERGENCE VALUE&nbsp;&nbsp; =&nbsp; 0.2525E-01&nbsp; CRITERION=&nbsp; 0.9872E-02&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; LINE SEARCH PARAMETER =&nbsp;&nbsp; 1.000&nbsp;&nbsp;&nbsp;&nbsp; SCALED MAX DOF INC =&nbsp; 0.2525E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; FORCE CONVERGENCE VALUE&nbsp; =&nbsp;&nbsp; 7.778&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CRITERION=&nbsp;&nbsp; 4.638&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;&nbsp;&nbsp; Writing NEWTON-RAPHSON residual forces to file: file.nr003&lt;br&gt;&nbsp;&nbsp;&nbsp; EQUIL ITER&nbsp; 25 COMPLETED.&nbsp; NEW TRIANG MATRIX.&nbsp; MAX DOF INC=&nbsp; 0.2590E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; DISP CONVERGENCE VALUE&nbsp;&nbsp; =&nbsp; 0.2590E-01&nbsp; CRITERION=&nbsp; 0.1113E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; LINE SEARCH PARAMETER =&nbsp;&nbsp; 1.000&nbsp;&nbsp;&nbsp;&nbsp; SCALED MAX DOF INC =&nbsp; 0.2590E-01&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp; FORCE CONVERGENCE VALUE&nbsp; =&nbsp;&nbsp; 6.809&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CRITERION=&nbsp;&nbsp; 4.647&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;&nbsp;&nbsp; Writing NEWTON-RAPHSON residual forces to file: file.nr004&lt;br&gt;&nbsp;&nbsp;&nbsp; EQUIL ITER&nbsp; 26 COMPLETED.&nbsp; NEW TRIANG MATRIX.&nbsp; MAX DOF INC=&nbsp; 0.2953E-01&lt;br&gt;&lt;br&gt;&nbsp;*** ERROR ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp; 15009.078&nbsp;&nbsp; TIME= 08:13:14&lt;br&gt;&nbsp;Solution not converged at time 4.14475 (load step 5 substep 5).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp; Run terminated.&nbsp;&nbsp;&nbsp;&lt;\/p&gt;&lt;p class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;\/div&gt;&lt;div&gt;&nbsp;&lt;\/div&gt;&lt;div&gt;After this, there were a number of summary for contact pairs, and then this:&lt;\/div&gt;&lt;div&gt;&lt;div id=&#8221;paraDiv&#8221;&gt;&lt;p id=&#8221;paragraphData&#8221; class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; R E S T A R T&nbsp;&nbsp; I N F O R M A T I O N&lt;br&gt;&lt;br&gt;&nbsp;REASON FOR TERMINATION. . . . . . . . . .UNCONVERGED SOLUTION&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;FILES NEEDED FOR RESTARTING . . . . . . .&nbsp; file0.Rnnn&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; file.ldhi&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; file.rdb&lt;br&gt;&nbsp;TIME OF LAST SOLUTION . . . . . . . . . .&nbsp; 4.1437&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;&nbsp;&nbsp; TIME AT START OF THE LOAD STEP . . . .&nbsp; 4.0000&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;&nbsp;&nbsp; TIME AT END OF THE LOAD STEP . . . . .&nbsp; 5.0000&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;NOTE: FOR CONVERGING SOLUTIONS, ADDITIONAL EQUILIBRIUM ITERATIONS MAY BE&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ADDED IN THE RESTART (NEQIT COMMAND) USING THE RESTART FILE file0.Rnnn&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&lt;br&gt;&nbsp;ALL CURRENT MAPDL DATA WRITTEN TO FILE NAME= file.db&lt;br&gt;&nbsp; FOR POSSIBLE RESUME FROM THIS POINT&lt;\/p&gt;&lt;p class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&lt;br&gt;&nbsp;NUMBER OF WARNING MESSAGES ENCOUNTERED=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17&lt;br&gt;&nbsp;NUMBER OF ERROR&nbsp;&nbsp; MESSAGES ENCOUNTERED=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4&lt;\/p&gt;&lt;p class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p class=&#8221;paragraphText&#8221; style=&#8221;font-size: 12px; display: inline;&#8221;&gt;&lt;br&gt;&nbsp;***** PROBLEM TERMINATED BY INDICATED ERROR(S) OR BY END OF INPUT DATA *****&lt;\/p&gt;&lt;\/div&gt;&lt;\/div&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394839","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I turned NR residual to 4 and the simulation still crashed, but got much further than it did before. 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