{"id":292433,"date":"2023-07-11T06:47:10","date_gmt":"2023-07-11T06:47:10","guid":{"rendered":"\/forum\/forums\/topic\/relying-on-global-courant-number-larger-than-unity\/"},"modified":"2023-07-11T06:47:10","modified_gmt":"2023-07-11T06:47:10","slug":"relying-on-global-courant-number-larger-than-unity","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/relying-on-global-courant-number-larger-than-unity\/","title":{"rendered":"Relying on Global Courant Number Larger Than Unity"},"content":{"rendered":"<div>Hi expert community<\/div>\n<div>&nbsp;<\/div>\n<div>In the context of <strong>adaptive <\/strong>timestep method, Fluent uses the smallest cell dimension to calculate the global Courant number during simulation. <span style=\"font-size: 14pt\">(Please see image below, that shows console during transient calculation.)<\/span><\/div>\n<div><img decoding=\"async\" title=\"Global Courant Number \" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/11-07-2023-1689057362-2023-07-11_09h34_48.png\" alt=\"\"><\/div>\n<div>1. Should I be committed, under any circumstances, to <span><strong>keeping the calculated global Courant number under unity<\/strong><\/span>? For example, if my Courant is 50 but my monitored field variables (average velocity, moment force etc,) reach stability by the end of every time step, is my solution reliable?<\/div>\n<div>&nbsp;<\/div>\n<div>2. <strong>If <\/strong>the Courant number <strong>can be larger than one<\/strong>, can I use a <span><strong>representative region<\/strong><\/span> in my domain, instead of the minimum cell size, for determining the acceptable highest limit for my Courant number? By representative region, I mean the region that both includes an intrinsic time-varying quantity, like a rotating blade&#8217;s tip speed and adjacent cell sizes, and also includes cells that are representative of the majority of cell size hoping that the solution, too, is representative of real physics of the model?<\/div>\n<div>I hope I am clear.<\/div>\n<div>&nbsp;<\/div>\n<div>Thanks<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-292433","topic","type-topic","status-closed","hentry","topic-tag-courant-number"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi expert community In the context of adaptive timestep method, Fluent uses the smallest cell dimension to calculate the global Courant number during simulation. (Please see image below, that shows console during transient calculation.)1. 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(Please see image below, that shows console during transient calculation.)1. Should I be committed, under any circumstances, to keeping the calculated global Courant number under unity? 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