{"id":392372,"date":"2024-11-01T09:14:41","date_gmt":"2024-11-01T09:14:41","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/"},"modified":"2024-11-01T09:14:41","modified_gmt":"2024-11-01T09:14:41","slug":"392372","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/","title":{"rendered":"Reply To: AQWA: Hydrodynamic response error"},"content":{"rendered":"<p>&lt;p&gt;(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?&lt;\/p&gt;&lt;p&gt;(2) Please check the sign of the coefficients of the off-diagonal 6&#215;6 matrices. I expect the values to be negative.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392372","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=\"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?(2) Please check the sign of the coefficients of the off-diagonal 6x6 matrices.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/\" \/>\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: AQWA: Hydrodynamic response error | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?(2) Please check the sign of the coefficients of the off-diagonal 6x6 matrices.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-01T09:14:41+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-01T09:14:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: AQWA: Hydrodynamic response error | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?(2) Please check the sign of the coefficients of the off-diagonal 6x6 matrices.\" \/>\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\\\/392372\\\/#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\\\/392372\\\/#listItem\",\"name\":\"Reply To: AQWA: Hydrodynamic response error\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/392372\\\/#listItem\",\"position\":2,\"name\":\"Reply To: AQWA: Hydrodynamic response error\",\"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\\\/392372\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/392372\\\/\",\"name\":\"Reply To: AQWA: Hydrodynamic response error | Ansys Learning Forum\",\"description\":\"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?(2) Please check the sign of the coefficients of the off-diagonal 6x6 matrices.\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/392372\\\/#breadcrumblist\"},\"datePublished\":\"2024-11-01T09:14:41+00:00\",\"dateModified\":\"2024-11-01T09:14:41+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Reply To: AQWA: Hydrodynamic response error | Ansys Learning Forum","description":"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. Is the stiffness with respect to the motions at the ends of the connection points or with respect to the COGs of connecting structures?(2) Please check the sign of the coefficients of the off-diagonal 6x6 matrices.","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/#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\/392372\/#listItem","name":"Reply To: AQWA: Hydrodynamic response error"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/#listItem","position":2,"name":"Reply To: AQWA: Hydrodynamic response error","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\/392372\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392372\/","name":"Reply To: AQWA: Hydrodynamic response error | Ansys Learning Forum","description":"(1) Please check your reference article on the defintion of the reference degrees of freedoms for the stiffness matrix. 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