{"id":374684,"date":"2024-08-01T14:19:02","date_gmt":"2024-08-01T14:19:02","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unexpected-high-speed-flow-in-ansys-240-compared-to-172\/"},"modified":"2024-08-05T12:56:36","modified_gmt":"2024-08-05T12:56:36","slug":"unexpected-high-speed-flow-in-ansys-240-compared-to-172","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unexpected-high-speed-flow-in-ansys-240-compared-to-172\/","title":{"rendered":"Unexpected High-Speed Flow in ANSYS 24.0 Compared to 17.2"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p>I am currently simulating a compressor which includes a rotating rotor using the MRF method. Previously, I used version 17.2 for the simulation and the flow field appeared normal. However, with the same settings, the simulation results in version 24 are very strange. There is a significant high-speed flow on the walls, which I believe is not a normal simulation result. Below are my settings. Are there significant differences between version 17 and version 24 for these settings?<\/p>\n<p><strong>Mesh:<\/strong><\/p>\n<ul>\n<li>Meshing Element size: 0.8mm<\/li>\n<li>Face sizing to MRF area: 0.6mm<\/li>\n<\/ul>\n<p><strong>Fluent setting:<\/strong><\/p>\n<ul>\n<li>Steady<\/li>\n<li>Reynolds stress model<\/li>\n<li>Frame motion Y = 1, -4850 rev\/min<\/li>\n<\/ul>\n<p><strong>Material:<\/strong><\/p>\n<ul>\n<li>R32<\/li>\n<li>Density: 61.5295 kg\/m&sup3;<\/li>\n<li>Viscosity: 1.5923e-05 kg\/ms<\/li>\n<\/ul>\n<p><strong>Boundary conditions:<\/strong><\/p>\n<ul>\n<li>Mass Flow inlet: 0.01353 kg\/s<\/li>\n<li>Pressure outlet: 2824315 Pa<\/li>\n<\/ul>\n<p><strong>Method:<\/strong><\/p>\n<ul>\n<li>Coupled<\/li>\n<\/ul>\n<p>Thank you!<\/p>\n","protected":false},"template":"","class_list":["post-374684","topic","type-topic","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=\"Hello everyone,I am currently simulating a compressor which includes a rotating rotor using the MRF method. 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There is a significant high-speed flow on the walls, which I\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unexpected-high-speed-flow-in-ansys-240-compared-to-172\/\" \/>\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=\"Unexpected High-Speed Flow in ANSYS 24.0 Compared to 17.2 | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello everyone,I am currently simulating a compressor which includes a rotating rotor using the MRF method. Previously, I used version 17.2 for the simulation and the flow field appeared normal. However, with the same settings, the simulation results in version 24 are very strange. There is a significant high-speed flow on the walls, which I\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/unexpected-high-speed-flow-in-ansys-240-compared-to-172\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-08-01T14:19:02+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-08-05T12:56:36+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Unexpected High-Speed Flow in ANSYS 24.0 Compared to 17.2 | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello everyone,I am currently simulating a compressor which includes a rotating rotor using the MRF method. Previously, I used version 17.2 for the simulation and the flow field appeared normal. 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