{"id":307445,"date":"2023-09-19T12:10:49","date_gmt":"2023-09-19T12:10:49","guid":{"rendered":"\/forum\/forums\/topic\/time-step-based-on-cfl-number-in-vof\/"},"modified":"2023-09-19T12:10:49","modified_gmt":"2023-09-19T12:10:49","slug":"time-step-based-on-cfl-number-in-vof","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-step-based-on-cfl-number-in-vof\/","title":{"rendered":"Time step based on CFL number in VOF"},"content":{"rendered":"<p>To whom it may concern,<\/p>\n<p>I an performing a multiphase simulation with VOF, and I would like to set the time step based on the Convective Courant Number (CCN) number.&nbsp;<\/p>\n<p>The only option that the solver offers is the Global Courant Number (GCN), although this approach by default is too aggresive in my case. I have tried to set &#8220;Physics Based Constraint&#8221; on in the Settings option. However, in this case, the time step is still very aggresive, and the CCN and the GCN are not related. Based on the user manual, the &#8220;Physics Based Constraint&#8221; shoul be very conservative, in particular because it uses the CCN, but for some reason something is not okay.<\/p>\n<p>I would like to know if you could please inform be if it is possible to set (like in single-phase simulations) a time stepd that depends only on the CCN.<\/p>\n<p>Thank you in advance<\/p>\n","protected":false},"template":"","class_list":["post-307445","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"To whom it may concern,I an performing a multiphase simulation with VOF, and I would like to set the time step based on the Convective Courant Number (CCN) number. The only option that the solver offers is the Global Courant Number (GCN), although this approach by default is too aggresive in my case. I have tried\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-step-based-on-cfl-number-in-vof\/\" \/>\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=\"Time step based on CFL number in VOF | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"To whom it may concern,I an performing a multiphase simulation with VOF, and I would like to set the time step based on the Convective Courant Number (CCN) number. The only option that the solver offers is the Global Courant Number (GCN), although this approach by default is too aggresive in my case. I have tried\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-step-based-on-cfl-number-in-vof\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-09-19T12:10:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-09-19T12:10:49+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Time step based on CFL number in VOF | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"To whom it may concern,I an performing a multiphase simulation with VOF, and I would like to set the time step based on the Convective Courant Number (CCN) number. The only option that the solver offers is the Global Courant Number (GCN), although this approach by default is too aggresive in my case. 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