{"id":35280,"date":"2019-05-11T18:33:50","date_gmt":"2019-05-11T18:33:50","guid":{"rendered":"\/forum\/forums\/topic\/fluent-dynamic-mesh-not-remeshing-or-layering\/"},"modified":"2019-05-11T18:33:50","modified_gmt":"2019-05-11T18:33:50","slug":"fluent-dynamic-mesh-not-remeshing-or-layering","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-dynamic-mesh-not-remeshing-or-layering\/","title":{"rendered":"Fluent Dynamic Mesh not remeshing or layering"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>I have a 3D FSI simulation which is an elastic cup that deforms by contraction to drive a flow.&nbsp; I have been able to get the 2D version to work, but the 3D version does not seem to function.&nbsp; I am using the dynamic mesh with smoothing, layering and remeshing, but I do not see any of that happening. I have tried:<\/p>\n<p><\/p>\n<p>In <strong>Smoothing<\/strong>:<\/p>\n<p><\/p>\n<ul><\/p>\n<li>Springs with<strong> Spring Constant<\/strong> 0 and <strong>Convergence Tolerance<\/strong> 0.001 for <strong>All Elements<\/strong><\/li>\n<p><\/p>\n<li>Diffusion with <strong>boundary-distance<\/strong> and <strong>Diffusion Parameter 0.1 <\/strong><\/li>\n<p><\/p>\n<li>Linearly Elastic Solid&nbsp; with Poisson&#8217;s ratio 0.25 and also 0.35<\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p>In <strong>Layering<\/strong>:<\/p>\n<p><\/p>\n<ul><\/p>\n<li>Height Based with <strong>Split Factor 0.4<\/strong> and <strong>Collapse Factor 0.1 <\/strong><\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p>In <strong>Remeshing<\/strong>:<\/p>\n<p><\/p>\n<ul><\/p>\n<li><strong>Local Cell<\/strong>, <strong>Local Face<\/strong>, <strong>Region Face<\/strong> with <strong>Minimum Length Scale<\/strong> set to 0, Max to 0.002<\/li>\n<p><\/p>\n<li>Also I tried <strong>CutCell Zone<\/strong> on and off.<\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p>In the <strong>Dynamic Mesh<\/strong> I have the boundary as <strong>System Coupling<\/strong> with <strong>Cell Height 0.001<\/strong>. I also have the fluid_body as <strong>Deforming<\/strong> with <strong>Remeshing and Smoothing<\/strong> enabled.<\/p>\n<p><\/p>\n<p>My mesh has a Body Size Function on the elements so that they are <strong>tetrahedrons of size 0.001.<\/strong><\/p>\n<p><\/p>\n<p>The problem is every single combination of these produces results like those shown in the gif &#8211; there is no change <strong>no matter which of the various settings<\/strong> I have tried.&nbsp; <em>All of the combinations<\/em> produce results that look <span style=\"text-decoration: underline;\"><em>just like<\/em><\/span> these.&nbsp; I have highlighted several nodes for consideration.&nbsp; Notice that there is <em>no remeshing<\/em>, <em>no internal movement<\/em>, nothing happens to the internal nodes at all. Shown is the symmetry plane as assigned in Fluent, and the solution up to the point of error.&nbsp; I need to continue the deformation much further past this point, but the <strong>Negative Cell Volume<\/strong> error keeps stopping the solution.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/G7JSJII.gif?width=690\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><strong>Questions:<\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><strong>1. I am getting a negative cell volume error.&nbsp; What should I look to change in order to get some kind of response from the <em>Mesh Methods<\/em> settings?&nbsp; Right now none of them seem to have ANY effect whatsoever.<\/strong><\/p>\n<p><\/p>\n<p><strong>2. What is the difference between interior-fluid_body (interior, id=1) and fluid_body (fluid, id =4) in my model tree.&nbsp; Should I be setting the deforming to one or the other or both??&nbsp; When I try to use the Graphics&gt;Mesh I cannot plot the mesh for fluid_body or fsi_fluent.&nbsp; Why?<\/strong><\/p>\n<p><\/p>\n<p><strong><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/8babacfe-69bd-457f-8c79-a9e90018d38c\/2e8763f8-2ef6-4c38-93a8-aa4a0131c77b_fluent-question.jpg?width=690&amp;upscale=false\" alt=\"\"><\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;Thanks!<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-35280","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["7452"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["4413"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["35280"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","20093","162192","165389","170807"],"_bbp_voice_count":["5"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["113280"],"_bbp_last_active_id":["113280"],"_bbp_last_active_time":["2020-05-02 16:06:09"]},"test":"ansysuser"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/35280","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\/35280\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=35280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}