{"id":379241,"date":"2024-08-16T05:41:21","date_gmt":"2024-08-16T05:41:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/379241\/"},"modified":"2024-08-16T05:41:21","modified_gmt":"2024-08-16T05:41:21","slug":"379241","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/379241\/","title":{"rendered":"Reply To: Adaptive time step for fluent in structural &#8211; fluent system coupling simulation"},"content":{"rendered":"<p>&lt;p&gt;Thanks Rob, and yes, my problem involves contact problem as well. A side question relates to smaller time step is that, when I use smaller time step (10^-4 vs. 10^-3), the system coupling becomes harder to converge, even the displacement and forces between source and target looks almost the same. On the other hand, sometimes pretty evident difference between source and target results in convergence. How do you usually avoid convergence issue? I have tried to increase iterations for system coupling and try to use similar mesh size for both FSI interface.&lt;\/p&gt;&lt;p&gt;Sincerely,&lt;\/p&gt;&lt;p&gt;Eric&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-379241","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=\"Thanks Rob, and yes, my problem involves contact problem as well. A side question relates to smaller time step is that, when I use smaller time step (10^-4 vs. 10^-3), the system coupling becomes harder to converge, even the displacement and forces between source and target looks almost the same. On the other hand, sometimes\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/379241\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Adaptive time step for fluent in structural \u2013 fluent system coupling simulation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Thanks Rob, and yes, my problem involves contact problem as well. A side question relates to smaller time step is that, when I use smaller time step (10^-4 vs. 10^-3), the system coupling becomes harder to converge, even the displacement and forces between source and target looks almost the same. On the other hand, sometimes\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/379241\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-08-16T05:41:21+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-08-16T05:41:21+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Adaptive time step for fluent in structural \u2013 fluent system coupling simulation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Thanks Rob, and yes, my problem involves contact problem as well. A side question relates to smaller time step is that, when I use smaller time step (10^-4 vs. 10^-3), the system coupling becomes harder to converge, even the displacement and forces between source and target looks almost the same. 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A side question relates to smaller time step is that, when I use smaller time step (10^-4 vs. 10^-3), the system coupling becomes harder to converge, even the displacement and forces between source and target looks almost the same. 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