{"id":311685,"date":"2023-10-16T17:18:31","date_gmt":"2023-10-16T17:18:31","guid":{"rendered":"\/forum\/forums\/topic\/udf-for-moving-a-wall\/"},"modified":"2023-10-16T17:18:31","modified_gmt":"2023-10-16T17:18:31","slug":"udf-for-moving-a-wall","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-moving-a-wall\/","title":{"rendered":"UDF for moving a wall"},"content":{"rendered":"<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/16-10-2023-1697476498-mceclip0.png\"><\/p>\n<p>I need to move this wall between two different fluid domains. It can&#8217;t be interior. So, I am providing UDF motion by DEFINE_CG_MOTION to both wall and wall_shadow. However, after a few time steps, I can see that the wall remains fixed there, while the layer below it keeps getting wider. Also, the wall with adjacent third zone is modelled as deforming and also the side walls of these cylinders. Is it right or is there any other way to move this wall sandwiched between two zones? Kindly, provide help.<\/p>\n","protected":false},"template":"","class_list":["post-311685","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=\"I need to move this wall between two different fluid domains. It can&#039;t be interior. So, I am providing UDF motion by DEFINE_CG_MOTION to both wall and wall_shadow. However, after a few time steps, I can see that the wall remains fixed there, while the layer below it keeps getting wider. Also, the wall with\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-moving-a-wall\/\" \/>\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=\"UDF for moving a wall | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I need to move this wall between two different fluid domains. It can&#039;t be interior. So, I am providing UDF motion by DEFINE_CG_MOTION to both wall and wall_shadow. However, after a few time steps, I can see that the wall remains fixed there, while the layer below it keeps getting wider. Also, the wall with\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-moving-a-wall\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/16-10-2023-1697476498-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/16-10-2023-1697476498-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-10-16T17:18:31+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-10-16T17:18:31+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"UDF for moving a wall | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I need to move this wall between two different fluid domains. It can&#039;t be interior. So, I am providing UDF motion by DEFINE_CG_MOTION to both wall and wall_shadow. However, after a few time steps, I can see that the wall remains fixed there, while the layer below it keeps getting wider. 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