{"id":392754,"date":"2024-11-05T10:46:14","date_gmt":"2024-11-05T10:46:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-realize-the-motion-that-a-rigid-body-moves-in-an-ellipse-path\/"},"modified":"2024-11-05T10:54:34","modified_gmt":"2024-11-05T10:54:34","slug":"how-to-realize-the-motion-that-a-rigid-body-moves-in-an-ellipse-path","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-realize-the-motion-that-a-rigid-body-moves-in-an-ellipse-path\/","title":{"rendered":"How to realize the motion that a rigid body moves in an elliptical path?"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;Hi everyone,&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;I want to do a 3D simulation that a rigid body moves in an elliptical path, now I have:&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;1. Center axis of the ellipse(in vector form);&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;2.Length of semi-major axis <strong>a<\/strong> and semi-minor axis <strong>b<\/strong>, as is shown in Figure below;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;3. Rotation speed of the object (rev\/min)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;How can I realize this motion, do I need to use UDF?&lt;\/p&gt;&lt;p&gt;and furthermore, any user-defined path. &lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;Regards&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/05-11-2024-1730803537-mceclip0.jpg\" \/>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392754","topic","type-topic","status-publish","hentry","topic-tag-fluent","topic-tag-udf"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi everyone, I want to do a 3D simulation that a rigid body moves in an elliptical path, now I have:1. 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