{"id":306249,"date":"2023-09-12T02:38:34","date_gmt":"2023-09-12T02:38:34","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=306249"},"modified":"2023-09-12T02:38:34","modified_gmt":"2023-09-12T02:38:34","slug":"velocity-field-divergence-simulating-ribbed-cylinder-using-dynamic-mesh-motion","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/velocity-field-divergence-simulating-ribbed-cylinder-using-dynamic-mesh-motion\/","title":{"rendered":"Velocity Field Divergence Simulating Ribbed Cylinder Using Dynamic Mesh Motion"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I recently ran a simulation trying to move a rib in a 2D approximation of a cylinder using the dynamic mesh motion. The flow is modelled as a two phase flow using the Eulerian multiphase model. The case is also run as transient. The mesh around the rib is shown below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/12-09-2023-1694485332-Rib Mesh Zone.png\" alt=\"\" width=\"667\" height=\"357\"><\/p>\n<p>The preview of the mesh motion showed the rib moving smoothly and without issue. The dynamic mesh zone was set to rotate with an angular velocity of 16.5 rad\/s. With a radius of 1.45 m, the maximum tangential speed experienced should be 23.9 m\/s. However, in the region near the rib, the velocity of the water shot up to almost 3500 m\/s. The maximum facet velocity and the contour of velocity magnitude in this region (both for the water phase) are shown below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/12-09-2023-1694485398-Facet Maximum of Velocity Magnitude - Water.png\" alt=\"\" width=\"882\" height=\"472\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/12-09-2023-1694485447-Contour of Maxmimum Velocity Magnitude - Water Phase.png\" alt=\"\" width=\"838\" height=\"413\"><\/p>\n<p>The mesh motion is described using a UDF, with a constant angular velocity of 16.5 rad\/s, defined using CG_MOTION. The UDF written is:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/12-09-2023-1694485857-udf.png\" alt=\"\">&nbsp;<\/p>\n<p>I&#8217;m currently trying to troubleshoot what could have caused this issue. I can provide more details if they are needed. As I go through the troubleshooting process, I&#8217;m curious if there is anything that stands out as an immediate culprit.&nbsp;&nbsp;<\/p>\n<p>Thank you.&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-306249","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=\"Hello,I recently ran a simulation trying to move a rib in a 2D approximation of a cylinder using the dynamic mesh motion. The flow is modelled as a two phase flow using the Eulerian multiphase model. The case is also run as transient. 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