{"id":459349,"date":"2026-06-04T17:03:19","date_gmt":"2026-06-04T17:03:19","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cartesian-mesh-with-inflation-layer-first-thickness-layer\/"},"modified":"2026-06-04T17:03:19","modified_gmt":"2026-06-04T17:03:19","slug":"cartesian-mesh-with-inflation-layer-first-thickness-layer","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cartesian-mesh-with-inflation-layer-first-thickness-layer\/","title":{"rendered":"Cartesian mesh with inflation layer (first thickness layer)"},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&lt;\/p&gt;&lt;p&gt;I&#8217;m simulating cavitation inside a Venturi 3Dchannel. My benchmark paper says that to couple turbulence, cavitation, and interface tracking correctly, I need a homogeneous volume mesh to avoid numerical diffusion variations.&lt;\/p&gt;&lt;p&gt;The paper shows Inflation layers: pure hexahedrons (quads on surface) to control Y\u207a (&asymp;1.5) with a specified First Layer Thickness.&lt;br&gt;Core flow: uniform Cartesian\/hex grid.&lt;\/p&gt;&lt;p&gt;The problem:&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; Ansys Meshing (Cartesian method): When I use the Cartesian method, it kills my inflation layers &ndash; reduces 10 layers to just 3, or fails completely. It can&#8217;t grow structured layers on a thin 3D body with this algorithm.&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; Fluent Meshing (Watertight Geometry): With Hexcore or Poly\u2011Hexcore volume mesh, the surface mesh is forced to be triangles. Then the boundary layers are extruded as triangular prisms (wedges), not pure hexahedrons.&lt;\/p&gt;&lt;p&gt;I want strictly hexahedral inflation layers, no wedges. The rest of the core can be Cartesian\/hex. My geometry dimensions: Length X = 350\u202fmm, Y = 25\u202fmm, thickness Z = 6.35\u202fmm. I&#8217;m using high\u2011order discretization schemes.&lt;\/p&gt;&lt;p&gt;My questions:&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; Is there a setting in Fluent Meshing (maybe TUI commands or a different workflow) to force a quad\/hex surface mesh before volume generation?&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; How can I force Ansys Meshing (Workbench) to respect a 10\u2011layer First\u2011Layer\u2011Thickness inflation without breaking or suppressing the Cartesian \/ MultiZone hexa\u2011core mesh?&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; Any workaround or alternative workflow to get this specific topology (hexahedral inflation + homogeneous hex core)?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-459349","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["459349"],"_bbp_author_ip":["45.236.45.56"],"_bbp_last_reply_id":["459416"],"_bbp_last_active_id":["459416"],"_bbp_last_active_time":["2026-06-05 18:53:51"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["549790","8124","199"],"_btv_view_count":["37"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["8124","199","549790"]},"test":"a20050237pucp-edu-pe"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/459349","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\/459349\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=459349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}