{"id":381227,"date":"2024-08-30T17:14:03","date_gmt":"2024-08-30T17:14:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\/"},"modified":"2024-08-30T17:14:03","modified_gmt":"2024-08-30T17:14:03","slug":"aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\/","title":{"rendered":"AQWA Hydrodynamic Diffraction \/ Non-symmetry in the ship added mass matrix"},"content":{"rendered":"<p>&lt;p&gt;I modeled a symmetrical ship hull in the xz plane using Aqwa to determine the hydrodynamic coefficients for added mass and potential damping. I imported the geometry into Design Modeler and aligned the xy plane with the waterline, setting the plane&#8217;s origin at the ship&#8217;s centerline. I divided the hull geometry into two sections&mdash;dry and wet&mdash;and successfully created a mirrored mesh, ensuring that the port side mesh was symmetrical to the starboard side. After reimporting the geometry into Aqwa, I added a mass point. As well explained in Faltinsen&#8217;s book, for the case without forward speed, the relations Aij = Aji and Bij = Bji must be respected. However, in my model, this is not observed for all terms. As examples are the terms A35 and A53:&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725036702-mceclip0.png\" \/>&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725036722-mceclip1.png\" \/>\\&lt;\/p&gt;&lt;p&gt;&lt;span class=&#8221;HwtZe&#8221; lang=&#8221;en&#8221;&gt;&lt;span class=&#8221;jCAhz ChMk0b&#8221;&gt;&lt;span class=&#8221;ryNqvb&#8221;&gt;Does anyone know why the symmetry of the matrix is \u200b\u200bnot respected?&lt;br&gt;Thanks in advance.&lt;br&gt;&lt;br&gt;Wave directions: -180 to 180 \/ number of directions: 9&nbsp;&lt;br&gt;Wave periods: 180s to 2s \/ number of periods: 21&nbsp;&lt;br&gt;Ship length: 55m&nbsp;&lt;br&gt;Mesh size: 0.4m&lt;br&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381227","topic","type-topic","status-publish","hentry","topic-tag-added-mass-1","topic-tag-ansys-aqwa","topic-tag-hydrodynamic-diffraction"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I modeled a symmetrical ship hull in the xz plane using Aqwa to determine the hydrodynamic coefficients for added mass and potential damping. I imported the geometry into Design Modeler and aligned the xy plane with the waterline, setting the plane&#039;s origin at the ship&#039;s centerline. I divided the hull geometry into two sections\u2014dry and\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\/\" \/>\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 Hydrodynamic Diffraction \/ Non-symmetry in the ship added mass matrix | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I modeled a symmetrical ship hull in the xz plane using Aqwa to determine the hydrodynamic coefficients for added mass and potential damping. I imported the geometry into Design Modeler and aligned the xy plane with the waterline, setting the plane&#039;s origin at the ship&#039;s centerline. 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I imported the geometry into Design Modeler and aligned the xy plane with the waterline, setting the plane&#039;s origin at the ship&#039;s centerline. I divided the hull geometry into two sections\u2014dry and\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725036702-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-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\\\/#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-tag\\\/hydrodynamic-diffraction\\\/#listItem\",\"name\":\"hydrodynamic-diffraction\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/hydrodynamic-diffraction\\\/#listItem\",\"position\":3,\"name\":\"hydrodynamic-diffraction\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/hydrodynamic-diffraction\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\\\/#listItem\",\"name\":\"AQWA Hydrodynamic Diffraction \\\/ Non-symmetry in the ship added mass matrix\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\\\/#listItem\",\"position\":4,\"name\":\"AQWA Hydrodynamic Diffraction \\\/ Non-symmetry in the ship added mass matrix\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/hydrodynamic-diffraction\\\/#listItem\",\"name\":\"hydrodynamic-diffraction\"}}]},{\"@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-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\\\/\",\"name\":\"AQWA Hydrodynamic Diffraction \\\/ Non-symmetry in the ship added mass matrix | Ansys Learning Forum\",\"description\":\"I modeled a symmetrical ship hull in the xz plane using Aqwa to determine the hydrodynamic coefficients for added mass and potential damping. 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I imported the geometry into Design Modeler and aligned the xy plane with the waterline, setting the plane's origin at the ship's centerline. I divided the hull geometry into two sections\u2014dry and","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725036702-mceclip0.png"},"aioseo_meta_data":{"post_id":"381227","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"content","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":true,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2024-10-28 16:30:40","updated":"2024-10-28 16:30:40","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/hydrodynamic-diffraction\/\" title=\"hydrodynamic-diffraction\">hydrodynamic-diffraction<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tAQWA Hydrodynamic Diffraction \/ Non-symmetry in the ship added mass matrix\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"hydrodynamic-diffraction","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/hydrodynamic-diffraction\/"},{"label":"AQWA Hydrodynamic Diffraction \/ Non-symmetry in the ship added mass matrix","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/aqwa-hydrodynamic-diffraction-non-symmetry-in-the-ship-added-mass-matrix\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["177.131.167.16"],"_btv_view_count":["434"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961","438961"],"_bbp_subscription":["180344","438961"],"_bbp_topic_id":["381227"],"_bbp_forum_id":["27792"],"_bbp_engagement":["180344","438961"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["389858"],"_bbp_last_active_id":["389858"],"_bbp_last_active_time":["2024-10-15 17:49:27"]},"test":"pohigorgmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381227\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=381227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}