{"id":290868,"date":"2023-06-29T09:59:55","date_gmt":"2023-06-29T09:59:55","guid":{"rendered":"\/forum\/forums\/reply\/290868\/"},"modified":"2023-06-29T09:59:55","modified_gmt":"2023-06-29T09:59:55","slug":"290868","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/290868\/","title":{"rendered":"Reply To: Modelling Active Heave Compensation in Ansys AQWA"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;The best approach for modelling active heave compensation is to use Aqwa&#8217;s user-defined force (UDF) functionality. This allows you to connect the time domain Aqwa solver to a Python server, which calls a Python function at each computational time-step. The solver passes the structure COG position and velocity at that time-step to the Python function, and this returns the forces\/moments that should be applied by the solver for that time-step at each structure&#8217;s COG.&lt;\/p&gt;&lt;p&gt;The Python server code is provided, along with some example UDFs, in your Ansys installation: e.g. C:\\Program Files\\ANSYS Inc\\v231\\aqwa\\utils\\ExternalForceCalculation. You can code the Python function to do anything you like, as long as the additional forces\/moments can be determined as a function of the structure&#8217;s COG position and velocity.&lt;\/p&gt;&lt;p&gt;I&#8217;m afraid I can&#8217;t provide any other coded examples beyond those available in the Ansys installation, but I&#8217;m happy to answer any other questions you might have.&lt;\/p&gt;&lt;p&gt;Cheers, Mike&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-290868","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=\"Hello,The best approach for modelling active heave compensation is to use Aqwa&#039;s user-defined force (UDF) functionality. This allows you to connect the time domain Aqwa solver to a Python server, which calls a Python function at each computational time-step. The solver passes the structure COG position and velocity at that time-step to the Python function,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/290868\/\" \/>\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: Modelling Active Heave Compensation in Ansys AQWA | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello,The best approach for modelling active heave compensation is to use Aqwa&#039;s user-defined force (UDF) functionality. 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