{"id":405526,"date":"2025-01-18T22:06:05","date_gmt":"2025-01-18T22:06:05","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/meshing-hsfld242-3-d-hydrostatic-fluid-elements-in-mechanical\/"},"modified":"2025-01-21T12:44:19","modified_gmt":"2025-01-21T12:44:19","slug":"meshing-hsfld242-3-d-hydrostatic-fluid-elements-in-mechanical","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/meshing-hsfld242-3-d-hydrostatic-fluid-elements-in-mechanical\/","title":{"rendered":"Meshing HSFLD242 3-D Hydrostatic Fluid Elements in Mechanical"},"content":{"rendered":"<p>&lt;p&gt;I have a 1\/8 model of a sphere with 3 planes of symmetry to support the cut faces of the sphere and an external face on the +X side to apply a pressure load. This has been meshed with SOLID186 quadratic hex elements. &lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/18-01-2025-1737236824-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;It solves just fine with no HSFLD242 inside.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/18-01-2025-1737236879-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;Now I want to create the incompressible fluid elements on the interior. I need a pressure node and want to use the ESURF command to create the HSFLD242 elements. I&#8217;m not sure if I am supposed to give the ESURF command the Named Selection name of the interior nodes or elements. I have one of each to try. Here is my first attempt at the APDL command object to build those elements:&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<pre>&lt;span style=\"font-size: 12pt;\"&gt;\/PREP7&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;CMSEL,S,InteriorNodes,NODE&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;N,9999,0,0,0&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;ET,,HSFLD242,,,,,,1&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;ESURF,,9999,&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;D,9999,UX,0&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;D,9999,UY,0&lt;\/span&gt;&lt;br&gt;&lt;span style=\"font-size: 12pt;\"&gt;D,9999,UZ,0&lt;\/span&gt;<\/pre>\n<p>&lt;p&gt;&lt;p&gt;Here is a portion of the Solution Output:&lt;\/p&gt;&lt;div id=&#8221;paraDiv&#8221; class=&#8221;text-color-primary&#8221; style=&#8221;display: inline;&#8221;&gt;&lt;\/p&gt;<\/p>\n<pre class=\" paragraphText text-color-primary\"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***** MAPDL ANALYSIS DEFINITION (PREP7) *****&lt;br&gt; SELECT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; COMPONENT INTERIORNODES&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt; NODE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9999&nbsp; KCS=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; X,Y,Z=&nbsp; 0.0000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.0000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.0000&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;ELEMENT TYPE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4 IS HSFLD242&nbsp;&nbsp;&nbsp;&nbsp; 3-D HYDROSTATIC FLUID&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp; KEYOPT( 1- 6)=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&lt;br&gt;&nbsp; KEYOPT( 7-12)=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&lt;br&gt;&nbsp; KEYOPT(13-18)=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&lt;br&gt;&lt;br&gt;&nbsp;CURRENT NODAL DOF SET IS&nbsp; UX&nbsp;&nbsp;&nbsp; UY&nbsp;&nbsp;&nbsp; UZ&nbsp;&nbsp;&nbsp; HDSP&lt;br&gt;&nbsp; THREE-DIMENSIONAL MODEL&lt;br&gt;&lt;br&gt;&nbsp;GENERATE ELEMENTS ON SURFACE DEFINED BY SELECTED NODES&lt;br&gt;  TYPE=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp; REAL=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp; MATERIAL=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp; ESYS=&nbsp;&nbsp;&nbsp; 0&lt;br&gt;&nbsp;*** ERROR ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.188&nbsp;&nbsp; TIME= 16:51:47&lt;br&gt; The ESURF command can produce only line or area elements.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt; NUMBER OF ELEMENTS GENERATED=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;*** WARNING ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.188&nbsp;&nbsp; TIME= 16:51:47&lt;br&gt;&nbsp;No surface elements were generated because no exterior face of the&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;br&gt;&nbsp;selected element set having all of its nodes selected is the correct&nbsp;&nbsp;&nbsp; &lt;br&gt; dimensionality for the specified surface element type.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/pre>\n<p>&lt;p&gt;&lt;p&gt;I get the same error if I use CMSEL,S,InteriorElements,ELEM&lt;\/p&gt;&lt;p&gt;Thanks in advance for any advice.&lt;\/p&gt;&lt;p&gt;Regards,&lt;\/p&gt;&lt;p&gt;Peter&lt;\/p&gt;&lt;\/div&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-405526","topic","type-topic","status-answered","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have a 1\/8 model of a sphere with 3 planes of symmetry to support the cut faces of the sphere and an external face on the +X side to apply a pressure load. 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It solves just fine with no HSFLD242 inside.Now I want to create"},"aioseo_meta_data":[],"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\tMeshing HSFLD242 3-D Hydrostatic Fluid Elements in Mechanical\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":"Meshing HSFLD242 3-D Hydrostatic Fluid Elements in Mechanical","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/meshing-hsfld242-3-d-hydrostatic-fluid-elements-in-mechanical\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["405526"],"_bbp_author_ip":["8.47.102.19"],"_bbp_last_reply_id":["406453"],"_bbp_last_active_id":["406453"],"_bbp_last_active_time":["2025-01-21 13:39:59"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["240","58821"],"_btv_view_count":["475"],"_bbp_topic_status":["answered"],"_bbp_subscription":["240","58821"],"_edit_last":["240"],"_bbp_revision_log":["a:1:{i:405527;a:2:{s:6:\"author\";i:240;s:6:\"reason\";s:0:\"\";}}"],"_edit_lock":["1737238319:240"]},"test":"peteroznewman"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405526","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405526\/revisions"}],"predecessor-version":[{"id":405527,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/405526\/revisions\/405527"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=405526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}