{"id":361989,"date":"2024-04-12T15:28:48","date_gmt":"2024-04-12T15:28:48","guid":{"rendered":"\/forum\/forums\/reply\/361989\/"},"modified":"2024-04-13T06:26:20","modified_gmt":"2024-04-13T06:26:20","slug":"361989","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/361989\/","title":{"rendered":"Reply To: Coupled Field Transient Analysis Convergence Issues"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Hi&lt;\/p&gt;&lt;p&gt;Is it not possible to use the file and model we provide in our tutorial (thermo-structural-analysis-of-a-brake-lesson-3\/) because that solves and works fine on the release we made it with (think 2020 R2).&lt;\/p&gt;&lt;p&gt;Thank you&lt;\/p&gt;&lt;p&gt;Erik&lt;\/p&gt;&lt;p&gt;Otherwise we can only provide some general advice.&lt;br&gt;&lt;br&gt;Some general advice is given below for troubleshooting nonlinear convergence.&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Training Chapter on Diagnostics in the Basic Structural Nonlinearities Training (Ansys Learning Hub).&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Overcoming Convergence Difficulties in ANSYS Workbench Mechanical, Part I: Using Newton-Raphson Residual Information&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.padtinc.com\/2012\/10\/10\/overcoming-convergence-difficulties-in-ansys-workbench-mechanical-part-i-using-newton-raphson-residual-information\/\">https:\/\/www.padtinc.com\/2012\/10\/10\/overcoming-convergence-difficulties-in-ansys-workbench-mechanical-part-i-using-newton-raphson-residual-information\/<\/a>&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Overcoming Convergence Difficulties in ANSYS Workbench Mechanical, Part II: Quick Usage of Mechanical APDL to Plot Distorted Elements&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.padtinc.com\/2012\/10\/18\/overcoming-convergence-difficulties-in-ansys-workbench-mechanical-part-ii-quick-usage-of-mechanical-apdl-to-plot-distorted-elements\/\">https:\/\/www.padtinc.com\/2012\/10\/18\/overcoming-convergence-difficulties-in-ansys-workbench-mechanical-part-ii-quick-usage-of-mechanical-apdl-to-plot-distorted-elements\/<\/a>&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Nonlinear Convergence Tips&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.ansystips.com\/2018\/06\/non-linear-convergence.html\">https:\/\/www.ansystips.com\/2018\/06\/non-linear-convergence.html<\/a>&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;1. Align nodes between contact and target if possible in the sliding direction (&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"http:\/\/www.ansystips.com\/2017\/09\/unintended-interference.html\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;link&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;)&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;2. Save Newton-Raphson Residuals &amp; Identify Element Violation before analysis starts (&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"http:\/\/www.ansystips.com\/2017\/04\/newton-raphson-residues.html\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;link&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;)&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;3. Use MPC for bonded contacts if needed (&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/caeai.com\/blog\/why-use-mpc-based-contact-bonded-connections\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;link&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;).&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;4. Set small initial time steps. Here is my default setting for difficult problems:&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/1.bp.blogspot.com\/-Ca8C9kPTFGI\/WzL-q34-h2I\/AAAAAAAAAug\/3JSMABgfh50HzH_L9WBA5atRwGRu4T5egCLcBGAs\/s1600\/StepControl.PNG\">&lt;!&#8211;\u2013\u2013 [if gte vml 1]\u2013&#8211;&gt; id=&rdquo;_x0000_t75&Prime; coordsize=&rdquo;21600,21600&Prime; o:spt=&rdquo;75&Prime; o:preferrelative=&rdquo;t&rdquo;&lt;br&gt;path=&rdquo;m@4@5l@4@11@9@11@9@5xe&rdquo; filled=&rdquo;f&rdquo; stroked=&rdquo;f&rdquo;&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;height:140.25pt&rsquo;&gt;&lt;br&gt;o:title=&rdquo;B1D0F173&Prime;\/&gt;&lt;br&gt;&lt;!&#8211;\u2013[endif]\u2013\u2013&#8211;&gt;&lt;!&#8211;\u2013\u2013 [if !vml]\u2013\u2013&#8211;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/Users\/ekostson\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image001.png\" width=\"201\" height=\"187\" border=\"0\" \/>&lt;!&#8211;\u2013\u2013[endif]\u2013\u2013&#8211;&gt;<\/a>&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;The first step would thus be 1\/100= 0.01s with a minimum time step of 1\/1000= 0.001s. Apply this to all &ldquo;Current Step Number&rdquo; of interest.&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;5. Have similar size mesh at contacts. If not, Contact has finer mesh while Target is coarser.&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;6.&nbsp;&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.ansystips.com\/2018\/03\/slide-and-dice-mesh-selected-body.html\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Slice and dice&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;&nbsp;geometry such that the volumes adjacent to contacts can be Hexahedron elements.&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&ndash; Starting with pretty mesh by the contacts reduces the distortion during the analysis.&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&ndash; Hexahedron&nbsp;elements are less distorted when capturing curved geometries (e.g. holes).&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;7. Drop Contact Normal Stiffness Factor (i.e. FKN) to 0.01. Watch out for excessive penetration.&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;8. Use&nbsp;&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.sharcnet.ca\/Software\/Ansys\/17.0\/en-us\/help\/wb_sim\/ds_contact_best_prac_setup.html#ds_contact_best_prac_contact_tool\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Contact Tool&nbsp;&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;to see if any contacts are open.&nbsp;&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"http:\/\/www.padtinc.com\/blog\/the-focus\/be-a-pinball-wizard-with-contact-regions-in-ansys-mechanical\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;Pinball radius&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;&nbsp;may need tweaking.&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;9. Switch model to Displacement driven instead of Force driven for better stability.&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;10. Avoid&nbsp;&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;DE&rdquo;&rdquo;&#8221;&gt;<a href=\"https:\/\/www.sharcnet.ca\/Software\/Ansys\/17.0\/en-us\/help\/ans_mul\/Hlp_G_MULTROUBOC.html\" target=\"_blank\" rel=\"noopener\">&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;over-constrained&lt;\/span&gt;<\/a>&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;&nbsp;model whenever possible (e.g. symmetry and bonded contacts)&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;&rdquo;EN-US&rdquo;&rdquo;&#8221;&gt;11. Move the body to be just in contact so that it doesn&rsquo;t &lsquo;fly&rsquo; a small distance before touching.&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-361989","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=\"HiIs it not possible to use the file and model we provide in our tutorial (thermo-structural-analysis-of-a-brake-lesson-3\/) because that solves and works fine on the release we made it with (think 2020 R2).Thank youErikOtherwise we can only provide some general advice.Some general advice is given below for troubleshooting nonlinear convergence.Training Chapter on Diagnostics in the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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