{"id":372926,"date":"2024-07-22T09:20:48","date_gmt":"2024-07-22T09:20:48","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/heave-decay-convergence-and-residuals\/"},"modified":"2024-07-22T09:20:48","modified_gmt":"2024-07-22T09:20:48","slug":"heave-decay-convergence-and-residuals","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/heave-decay-convergence-and-residuals\/","title":{"rendered":"Heave Decay Convergence and Residuals"},"content":{"rendered":"<p>I am trying to simulate the heave decay of a cylindrical spar hull. The residual seems to stay steady and not drop (see uploaded images below). The solution seems to be converging at every time step, as can be seen highlighted in the console.&nbsp;<br \/>I made some changes to the default convergence criteria by lowering all the residuals threshold criteria from 0.001 to 0.0005. but the residuals behaved the same, ie residual not droping down.<br \/>Is this a normal thing, or is there a problem somewhere?<br \/>By the way, I use 6dof with smoothing and remashing enabled. <\/p>\n<p>Thanks for your time&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" title=\"heave decay residuals\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721638430-residuals_Heave_analysis_of_a_spar.jpg\" alt=\"residuals \" width=\"720\" height=\"366\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" title=\"phase fraction water\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721639748-contour_Phase_fraction_water.jpg\" alt=\"contour phase\" width=\"502\" height=\"248\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" title=\"plane xy mesh\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721639826-mesh_1.jpg\" alt=\"mesh 1\" width=\"488\" height=\"243\"><\/p>\n","protected":false},"template":"","class_list":["post-372926","topic","type-topic","status-closed","hentry","topic-tag-fluent-ansys-1","topic-tag-fluent-cfd-ansys-1","topic-tag-ForumCoordinator-1","topic-tag-fsi-transient-1","topic-tag-6-dof-solver","topic-tag-fluent-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to simulate the heave decay of a cylindrical spar hull. The residual seems to stay steady and not drop (see uploaded images below). The solution seems to be converging at every time step, as can be seen highlighted in the console. I made some changes to the default convergence criteria by lowering all\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/heave-decay-convergence-and-residuals\/\" \/>\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=\"Heave Decay Convergence and Residuals | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am trying to simulate the heave decay of a cylindrical spar hull. The residual seems to stay steady and not drop (see uploaded images below). The solution seems to be converging at every time step, as can be seen highlighted in the console. I made some changes to the default convergence criteria by lowering all\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/heave-decay-convergence-and-residuals\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721638430-residuals_Heave_analysis_of_a_spar.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721638430-residuals_Heave_analysis_of_a_spar.jpg\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-07-22T09:20:48+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-07-22T09:20:48+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Heave Decay Convergence and Residuals | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am trying to simulate the heave decay of a cylindrical spar hull. The residual seems to stay steady and not drop (see uploaded images below). The solution seems to be converging at every time step, as can be seen highlighted in the console. I made some changes to the default convergence criteria by lowering all\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/22-07-2024-1721638430-residuals_Heave_analysis_of_a_spar.jpg\" \/>\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\\\/heave-decay-convergence-and-residuals\\\/#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\\\/6-dof-solver\\\/#listItem\",\"name\":\"6-dof-solver\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/6-dof-solver\\\/#listItem\",\"position\":3,\"name\":\"6-dof-solver\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/6-dof-solver\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/heave-decay-convergence-and-residuals\\\/#listItem\",\"name\":\"Heave Decay Convergence and Residuals\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/heave-decay-convergence-and-residuals\\\/#listItem\",\"position\":4,\"name\":\"Heave Decay Convergence and Residuals\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/6-dof-solver\\\/#listItem\",\"name\":\"6-dof-solver\"}}]},{\"@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\\\/heave-decay-convergence-and-residuals\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/heave-decay-convergence-and-residuals\\\/\",\"name\":\"Heave Decay Convergence and Residuals | Ansys Learning Forum\",\"description\":\"I am trying to simulate the heave decay of a cylindrical spar hull. 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