{"id":383629,"date":"2024-09-23T10:21:09","date_gmt":"2024-09-23T10:21:09","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/383629\/"},"modified":"2024-09-23T10:21:09","modified_gmt":"2024-09-23T10:21:09","slug":"383629","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/383629\/","title":{"rendered":"Reply To: Inviscid flow over a semicircle simulation issue"},"content":{"rendered":"<p>&lt;p&gt;Even if flow is inviscid, recirculation will be introduced due to artificial viscosity (from numerical schemes and spatial discretization) which in turn will create vorticities. So there will be &#8220;separation&#8221; behind objects.&lt;\/p&gt;&lt;p&gt;Solving the potential equation will yield the results you expect as irrotationality of the flow is assumed. Since you have a simple case, to get an idea of what the flow field would look like you can initialize using hybrid initialization which does that; solves Laplace&#8217;s equation to obtain the velocity field.&lt;\/p&gt;&lt;p&gt;Otherwise you can limit this artificial viscosity by further refining the grid and using higher order discretizations, which might still not completely give you what you want.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-383629","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=\"Even if flow is inviscid, recirculation will be introduced due to artificial viscosity (from numerical schemes and spatial discretization) which in turn will create vorticities. So there will be &quot;separation&quot; behind objects.Solving the potential equation will yield the results you expect as irrotationality of the flow is assumed. Since you have a simple case, to\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/383629\/\" \/>\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: Inviscid flow over a semicircle simulation issue | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Even if flow is inviscid, recirculation will be introduced due to artificial viscosity (from numerical schemes and spatial discretization) which in turn will create vorticities. So there will be &quot;separation&quot; behind objects.Solving the potential equation will yield the results you expect as irrotationality of the flow is assumed. Since you have a simple case, to\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/383629\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-09-23T10:21:09+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-09-23T10:21:09+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Inviscid flow over a semicircle simulation issue | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Even if flow is inviscid, recirculation will be introduced due to artificial viscosity (from numerical schemes and spatial discretization) which in turn will create vorticities. So there will be &quot;separation&quot; behind objects.Solving the potential equation will yield the results you expect as irrotationality of the flow is assumed. 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So there will be \"separation\" behind objects.Solving the potential equation will yield the results you expect as irrotationality of the flow is assumed. 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