{"id":345037,"date":"2024-01-17T07:55:16","date_gmt":"2024-01-17T07:55:16","guid":{"rendered":"\/forum\/forums\/topic\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\/"},"modified":"2024-01-17T07:55:16","modified_gmt":"2024-01-17T07:55:16","slug":"aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\/","title":{"rendered":"AQWA LINE: wrong angle of the principle axes of the cut water plane area"},"content":{"rendered":"<p>For a specific geometry, AQWA LINE changes the angle the principal axes of the cut water plane area make with the fixed reference axis system to 90, when calculating the hydrostatic properties. This is however not in line with the model and leads to wrong values of the second moments of area, wrong GM values and therefore wrong RAOs.<\/p>\n<p>Is there a way of preventing AQWA LINE from changing the angle of the principle axis of the cut water plane area with respect to the fixed reference axis system?&nbsp;<\/p>\n<p>The geometry is as follows: <img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/17-01-2024-1705477908-mceclip0.png\"><\/p>\n<p>Remarkable is that for a geometry with pillars at the bow as well, this problem does not occur: <img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/17-01-2024-1705477961-mceclip1.png\"><\/p>\n","protected":false},"template":"","class_list":["post-345037","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"For a specific geometry, AQWA LINE changes the angle the principal axes of the cut water plane area make with the fixed reference axis system to 90, when calculating the hydrostatic properties. This is however not in line with the model and leads to wrong values of the second moments of area, wrong GM values\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\/\" \/>\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=\"AQWA LINE: wrong angle of the principle axes of the cut water plane area | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"For a specific geometry, AQWA LINE changes the angle the principal axes of the cut water plane area make with the fixed reference axis system to 90, when calculating the hydrostatic properties. This is however not in line with the model and leads to wrong values of the second moments of area, wrong GM values\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/17-01-2024-1705477908-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/17-01-2024-1705477908-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-01-17T07:55:16+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-01-17T07:55:16+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"AQWA LINE: wrong angle of the principle axes of the cut water plane area | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"For a specific geometry, AQWA LINE changes the angle the principal axes of the cut water plane area make with the fixed reference axis system to 90, when calculating the hydrostatic properties. This is however not in line with the model and leads to wrong values of the second moments of area, wrong GM values\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/17-01-2024-1705477908-mceclip0.png\" \/>\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\\\/topic\\\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\\\/#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\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\\\/#listItem\",\"name\":\"AQWA LINE: wrong angle of the principle axes of the cut water plane area\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\\\/#listItem\",\"position\":3,\"name\":\"AQWA LINE: wrong angle of the principle axes of the cut water plane area\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@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\\\/topic\\\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-line-wrong-angle-of-the-principle-axes-of-the-cut-water-plane-area\\\/\",\"name\":\"AQWA LINE: wrong angle of the principle axes of the cut water plane area | Ansys Learning Forum\",\"description\":\"For a specific geometry, AQWA LINE changes the angle the principal axes of the cut water plane area make with the fixed reference axis system to 90, when calculating the hydrostatic properties. 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