{"id":389984,"date":"2024-10-16T09:58:16","date_gmt":"2024-10-16T09:58:16","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hydrostatic-fluid-elements-iterative-solution\/"},"modified":"2024-10-16T09:58:16","modified_gmt":"2024-10-16T09:58:16","slug":"hydrostatic-fluid-elements-iterative-solution","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hydrostatic-fluid-elements-iterative-solution\/","title":{"rendered":"Hydrostatic fluid elements: iterative solution"},"content":{"rendered":"<p>&lt;p&gt;Hello all,&lt;\/p&gt;&lt;p&gt;when modeling fluids or gases contained by solids using HSFLD241 or HSFLD242 elements, the volume and pressure of the contained space is calculated using varitional quantities (as show in &lt;span style=&#8221;font-size: 14pt;&#8221;&gt;13.242.2. Element Matrices and Load Vectors). How I understand this is that the volumetric change of the contained space is solved iteratively. My questions is, that if I have a static structural analysis where NLGEOM,off, is the volume still solved iteratively? If yes, then this happens inside the ANSYS Solver and the user cannot see it: I can accept it as it is. If the answer is no, is linear analysis solution still valid (assuming the deformations are small) or should NLGEOM be always on when using HSFLD elements?&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;Wbr, Janne&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389984","topic","type-topic","status-publish","hentry","topic-tag-hydrostatic","topic-tag-mechanical","topic-tag-structures"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello all,when modeling fluids or gases contained by solids using HSFLD241 or HSFLD242 elements, the volume and pressure of the contained space is calculated using varitional quantities (as show in 13.242.2. Element Matrices and Load Vectors). How I understand this is that the volumetric change of the contained space is solved iteratively. My\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hydrostatic-fluid-elements-iterative-solution\/\" \/>\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=\"Hydrostatic fluid elements: iterative solution | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello all,when modeling fluids or gases contained by solids using HSFLD241 or HSFLD242 elements, the volume and pressure of the contained space is calculated using varitional quantities (as show in 13.242.2. 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How I understand this is that the volumetric change of the contained space is solved iteratively. 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