{"id":394990,"date":"2024-11-22T15:20:30","date_gmt":"2024-11-22T15:20:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394990\/"},"modified":"2024-11-22T15:20:30","modified_gmt":"2024-11-22T15:20:30","slug":"394990","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394990\/","title":{"rendered":"Reply To: Static Structural: Such thing as Centripetal Force?"},"content":{"rendered":"<p>&lt;p&gt;I was wrong about the sign of the rotational velocity being ignored.&nbsp; It&#8217;s just that the centrifugal forces are the same whether the rotational velocity is positive or negative.&nbsp; There is an APDL way to apply centripetal force as illustrated by the commands below.&nbsp; The LDREAD command can read the reaction forces from a previous solution.&nbsp; So the idea is to apply the rotational velocity to the model completely fixed and then read the reaction forces into a subsequent analysis LDREAD,REAC,Last.&nbsp; &nbsp;Because the reaction forces have the opposite sign of the centrifugal forces, they are converted to centripetal forces.&nbsp; This procedure might be problematic in Workbench Mechanical because the initial rst file has to be moved to the working directory and Mechanical deletes all the files when the solution starts.&nbsp; Maybe a command like \/sys, copy D:\\path\\file.rst .&nbsp; could copy it over just before the LDREAD command.&lt;\/p&gt;&lt;p&gt;\/prep7&lt;br&gt;et,1,185&lt;br&gt;mp,ex,1,1e7&lt;br&gt;mp,nuxy,1,0.3&lt;br&gt;mp,dens,1,0.000754&lt;br&gt;block,9,10,,10,,1&lt;br&gt;esize,.5&lt;br&gt;vmesh,1&lt;\/p&gt;&lt;p&gt;d,all,all&lt;br&gt;fini&lt;\/p&gt;&lt;p&gt;\/solu&lt;br&gt;omega,,,1000&lt;br&gt;solve&lt;br&gt;fini&lt;\/p&gt;&lt;p&gt;\/prep7&lt;br&gt;ddele,all,all&lt;br&gt;omega,0,0,0 &nbsp; &nbsp; &nbsp; &nbsp;! Zero rotational velocity&lt;br&gt;nsel,s,loc,y,0&lt;br&gt;d,all,all&lt;br&gt;nsel,all&lt;br&gt;ldread,reac,last &nbsp; ! Read reaction forces from first analysis&lt;br&gt;fini&lt;\/p&gt;&lt;p&gt;\/solu&lt;br&gt;solve&lt;br&gt;fini&lt;\/p&gt;&lt;p&gt;\/post1&lt;br&gt;set,last&lt;br&gt;plnsol,ux&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394990","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=\"I was wrong about the sign of the rotational velocity being ignored. It&#039;s just that the centrifugal forces are the same whether the rotational velocity is positive or negative. There is an APDL way to apply centripetal force as illustrated by the commands below. The LDREAD command can read the reaction forces from a previous\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394990\/\" \/>\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: Static Structural: Such thing as Centripetal Force? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I was wrong about the sign of the rotational velocity being ignored. It&#039;s just that the centrifugal forces are the same whether the rotational velocity is positive or negative. There is an APDL way to apply centripetal force as illustrated by the commands below. The LDREAD command can read the reaction forces from a previous\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394990\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-22T15:20:30+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-22T15:20:30+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Static Structural: Such thing as Centripetal Force? | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I was wrong about the sign of the rotational velocity being ignored. It&#039;s just that the centrifugal forces are the same whether the rotational velocity is positive or negative. There is an APDL way to apply centripetal force as illustrated by the commands below. The LDREAD command can read the reaction forces from a previous\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/394990\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/394990\\\/#listItem\",\"name\":\"Reply To: Static Structural: Such thing as Centripetal Force?\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/394990\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Static Structural: Such thing as Centripetal Force?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/394990\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/394990\\\/\",\"name\":\"Reply To: Static Structural: Such thing as Centripetal Force? | Ansys Learning Forum\",\"description\":\"I was wrong about the sign of the rotational velocity being ignored. 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It's just that the centrifugal forces are the same whether the rotational velocity is positive or negative. There is an APDL way to apply centripetal force as illustrated by the commands below. The LDREAD command can read the reaction forces from a previous","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394990\/","article:published_time":"2024-11-22T15:20:30+00:00","article:modified_time":"2024-11-22T15:20:30+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Static Structural: Such thing as Centripetal Force? | Ansys Learning Forum","twitter:description":"I was wrong about the sign of the rotational velocity being ignored. It's just that the centrifugal forces are the same whether the rotational velocity is positive or negative. There is an APDL way to apply centripetal force as illustrated by the commands below. 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