{"id":392108,"date":"2024-10-30T18:33:17","date_gmt":"2024-10-30T18:33:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392108\/"},"modified":"2024-10-30T18:33:17","modified_gmt":"2024-10-30T18:33:17","slug":"392108","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392108\/","title":{"rendered":"Reply To: AQWA: Hydrodynamic response error"},"content":{"rendered":"<p>&lt;p&gt;Will you need to define more connection stiffness 6&#215;6 sub-matrices?&nbsp; For example, from the linkages of the first row of 5 structures, you may need&lt;\/p&gt;&lt;p&gt;(1A,1A), (1A,2A), (2A,2A), (2A,3A), (3A,3A), (3A,4A), (4A,4A), (4A,5A), (5A,5A) (9 6X6 sub-matrices for the first row). 27 6&#215;6 sub-matrices for all 3 rows.&lt;\/p&gt;&lt;p&gt;For the first column&#8217;s additional sub-matrices due to the linkages, you should have (1A, 1B), (1B,1C) 6X6 sub-matrices. 10 additional sub-matrices for all the columns.&lt;\/p&gt;&lt;p&gt;In total, you may have 37 6&#215;6 sub-matrices.&lt;\/p&gt;&lt;p&gt;Will the fixed point to structure mooring lines represent the joint condition well?&nbsp; &nbsp;It may be nice to use the connection stiffness matrices directly.&nbsp; You could use a presolve script to remove NASF option (Not use the additional structure stiffness matrix) from the hydrodynamic response analysis input data file. Alternative, switch on the beta option,&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/30-10-2024-1730312955-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;Then in Hydrodyanmci response analsyis, set Include Linear Connection Stiffness Matrices as Yes. It will include the connection stiffness if it is defined.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/30-10-2024-1730312860-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392108","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=\"Will you need to define more connection stiffness 6x6 sub-matrices? 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