{"id":357743,"date":"2024-03-18T21:02:02","date_gmt":"2024-03-18T21:02:02","guid":{"rendered":"\/forum\/forums\/topic\/peaks-of-lift-coefficient\/"},"modified":"2024-03-18T21:02:02","modified_gmt":"2024-03-18T21:02:02","slug":"peaks-of-lift-coefficient","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/peaks-of-lift-coefficient\/","title":{"rendered":"Peaks of lift coefficient"},"content":{"rendered":"<p>I am running a 3D simulation of cross-flow over an elastically mounted circular cylinder utilizing DDES at subcritical Reynolds, applying Dynamic mesh by compiling a UDF file to move the cylinder accordingly.&nbsp;<\/p>\n<p>The case is to be run on HPC with a maximum available wall time of 3 days, so I take the last data file and continue the simulation again from what I had stopped before, but the problem with that&nbsp; is at the very first time steps, the lift coefficient has a really huge values, before it smoothes out again to the values that it had before at the old data file. The problem with this that those large values most probably affect the movement of the cylinder and make it displaced way more than it should, ending up with discontinuities in the amplitude history.<\/p>\n<p>Any solutions to wipe out these first very high values of lift?&nbsp; and why this happens? given that at those early time steps, the flow is totally converged.<\/p>\n","protected":false},"template":"","class_list":["post-357743","topic","type-topic","status-closed","hentry","topic-tag-Forcecalculation-1","topic-tag-vibration"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am running a 3D simulation of cross-flow over an elastically mounted circular cylinder utilizing DDES at subcritical Reynolds, applying Dynamic mesh by compiling a UDF file to move the cylinder accordingly. The case is to be run on HPC with a maximum available wall time of 3 days, so I take the last data file\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/peaks-of-lift-coefficient\/\" \/>\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=\"Peaks of lift coefficient | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am running a 3D simulation of cross-flow over an elastically mounted circular cylinder utilizing DDES at subcritical Reynolds, applying Dynamic mesh by compiling a UDF file to move the cylinder accordingly. The case is to be run on HPC with a maximum available wall time of 3 days, so I take the last data file\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/peaks-of-lift-coefficient\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-03-18T21:02:02+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-03-18T21:02:02+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Peaks of lift coefficient | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am running a 3D simulation of cross-flow over an elastically mounted circular cylinder utilizing DDES at subcritical Reynolds, applying Dynamic mesh by compiling a UDF file to move the cylinder accordingly. 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