{"id":462248,"date":"2026-08-05T12:15:40","date_gmt":"2026-08-05T12:15:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-wind-turbine-not-rotating\/"},"modified":"2026-08-05T12:15:40","modified_gmt":"2026-08-05T12:15:40","slug":"6dof-wind-turbine-not-rotating","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-wind-turbine-not-rotating\/","title":{"rendered":"6DOF wind turbine not rotating"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I ran previously 2D cases for a wind turbine using 6DOF solver &#8211; 1DOF rotation without problems. For the 3D case the turbine doesn&#8217;t want to rotate with a reasonable angular velocity. Normally the rotation is defined by UDF but even if I define it internally via UI the problem remains identical &#8211; the turbine rotates extremely slowly (in the order of 1e-04rad\/s) despite monitoring a good amount of torque induced by aerodynamic forces. I isolated many possible problems to no success. I tested defining a similar torque via spring preload in the 6DOF Properties menu and the problem remained identical. If I define very large preload (100x larger) the angular velocity increases to about 1e-02 and stays there. Moment center and rotation axis vector seem to be correct because, if I define the movement outside 6DOF Dynamic mesh using mesh motion of the turbine cell zone, the rotation is calculated correctly.&lt;\/p&gt;&lt;p&gt;Some more things I tested:&lt;\/p&gt;&lt;p&gt;-Moving turbine center to the global center coordinate&lt;\/p&gt;&lt;p&gt;-testing low and high values of moment of inertia&lt;\/p&gt;&lt;p&gt;-imlicit update&lt;\/p&gt;&lt;p&gt;-recreated a fresh cas. file while I imported only the complete mesh via Fluent meshing&lt;\/p&gt;&lt;p&gt;-normaly the axis of rotation is tilted but I tilted the whole domain so that I could use a simple rotation vector (0, 1, 0)&lt;\/p&gt;&lt;p&gt;To conclude, the turbine is moving extremely slowly despite correct fluid flow and torque calculation.&lt;\/p&gt;&lt;p&gt;I hope you can help me this time.&lt;\/p&gt;&lt;p&gt;Best regards&lt;\/p&gt;&lt;p&gt;Daniel&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-462248","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=\"Hi,I ran previously 2D cases for a wind turbine using 6DOF solver - 1DOF rotation without problems. 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For the 3D case the turbine doesn't want to rotate with a reasonable angular velocity. 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For the 3D case the turbine doesn't want to rotate with a reasonable angular velocity. Normally the rotation is defined by UDF but even if I define it internally via UI the problem remains identical - the turbine","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/6dof-wind-turbine-not-rotating\/","article:published_time":"2026-08-05T12:15:40+00:00","article:modified_time":"2026-08-05T12:15:40+00:00","twitter:card":"summary_large_image","twitter:title":"6DOF wind turbine not rotating | Ansys Learning Forum","twitter:description":"Hi,I ran previously 2D cases for a wind turbine using 6DOF solver - 1DOF rotation without problems. For the 3D case the turbine doesn't want to rotate with a reasonable angular velocity. 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