{"id":292471,"date":"2023-07-11T08:44:58","date_gmt":"2023-07-11T08:44:58","guid":{"rendered":"\/forum\/forums\/reply\/292471\/"},"modified":"2023-07-11T08:44:58","modified_gmt":"2023-07-11T08:44:58","slug":"292471","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/292471\/","title":{"rendered":"Reply To: Relying on Global Courant Number Larger Than Unity"},"content":{"rendered":"<p>&lt;p&gt;If your results are converged at the end of each time step then you&#8217;re probably going to get an accurate result (mesh etc assumed to be good).&nbsp;&lt;\/p&gt;&lt;p&gt;Be careful with blind adherence to a number. The highest courant number could be in a region with near enough zero gradients so won&#8217;t overly effect stability. Setting too high a value in the adaptive stepping may well cause you problems, too low and it&#8217;ll take ages to march through time. If you&#8217;re looking at updating cell position (rotating parts) if you jump cells in a time step you risk blade wake\/tip effects not being picked up across the interface: courant number will be big and your result may be rubbish.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-292471","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=\"If your results are converged at the end of each time step then you&#039;re probably going to get an accurate result (mesh etc assumed to be good). Be careful with blind adherence to a number. The highest courant number could be in a region with near enough zero gradients so won&#039;t overly effect stability. Setting too\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/292471\/\" \/>\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: Relying on Global Courant Number Larger Than Unity | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"If your results are converged at the end of each time step then you&#039;re probably going to get an accurate result (mesh etc assumed to be good). Be careful with blind adherence to a number. The highest courant number could be in a region with near enough zero gradients so won&#039;t overly effect stability. 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Be careful with blind adherence to a number. The highest courant number could be in a region with near enough zero gradients so won't overly effect stability. 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