{"id":462100,"date":"2026-08-03T02:32:14","date_gmt":"2026-08-03T02:32:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/netm-porous-solid-zone-adjacent-solid-walls-default-to-adiabatic\/"},"modified":"2026-08-03T02:32:14","modified_gmt":"2026-08-03T02:32:14","slug":"netm-porous-solid-zone-adjacent-solid-walls-default-to-adiabatic","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/netm-porous-solid-zone-adjacent-solid-walls-default-to-adiabatic\/","title":{"rendered":"NETM porous solid zone: adjacent solid walls default to adiabatic"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">I am running a conjugate heat transfer simulation in Fluent 2025 R2 in which a CPU heat sink fin array is represented as a porous medium with the Non-Equilibrium Thermal Model (NETM). I cannot transfer heat from the heat sink base into the auto-generated porous solid zone, and would appreciate guidance.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Model summary<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Fin block as a porous zone: porosity 0.48, viscous resistance 2.958e6 1\/m^2, interfacial area density 320 1\/m, h_sf via expression<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Working fluid: mineral oil, single-phase immersion cooling<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Conduction chain: solid_cpu (200 W volumetric source) &rarr; solid_tim &rarr; solid_heatsink &rarr; fin block<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Mesh generated in ICEM CFD with shared topology, i.e. the heat sink \/ porous block interface is conformal<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Problem<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">When NETM is enabled, Fluent creates the solid cell zone <code class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\">fluid_porous_fin:013<\/code>. The wall zones adjacent to this zone are one-sided, and their Thermal panel offers only Heat Flux \/ Temperature \/ Convection \/ Radiation \/ Mixed \/ via System Coupling. The &#8220;Coupled&#8221; option is not available, and &#8220;via Mapped Interface&#8221; is greyed out.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Relevant zones:<\/p>\n<div class=\"relative group\/copy bg-bg-000\/50 border-0.5 border-border-400 rounded-lg focus:outline-none focus-visible:ring-2 focus-visible:ring-accent-100\" role=\"group\" aria-label=\"\ucf54\ub4dc\">\n<div class=\"sticky opacity-0 group-hover\/copy:opacity-100 group-focus-within\/copy:opacity-100 top-2 py-2 h-12 w-0 float-right\">\n<div class=\"absolute right-0 h-8 px-2 items-center inline-flex z-10\">&nbsp;<\/div>\n<\/div>\n<div class=\"overflow-x-auto\">\n<pre class=\"code-block__code !my-0 !rounded-lg !text-sm !leading-relaxed p-3.5\"><code>13   fluid_porous_fin:013         solid (copper)       cell\n146  fluid_porous_fin             fluid (mineral oil)  cell\n77   solid_heatsink               solid (copper)       cell\n158  wall_porous_fin              wall -&gt; solid_heatsink side\n163  wall_porous_fin-shadow       wall -&gt; fluid_porous_fin side (coupled pair with 158)\n16   wall_porous_fin-shadow:016   wall -&gt; fluid_porous_fin:013, one-sided, adiabatic<\/code><\/pre>\n<\/div>\n<\/div>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">A flux report confirms the total heat transfer rate into all zones adjacent to <code class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\">fluid_porous_fin:013<\/code> is 0 W, while the user energy source is 200 W.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Because every wall bounding <code class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\">fluid_porous_fin:013<\/code> defaults to adiabatic, no heat can enter the porous solid to be redistributed over the fin surfaces. The only remaining conduction path from the base into the oil is the narrow base strip directly wetted by the fluid, and that path removes only about 51 W. The remaining 149 W has no available path: even after the residuals have flattened, this 149 W deficit (75 % of the input) persists and the case cannot close its energy balance. This starved heat-removal path drives the CPU temperature to approximately 645 K and the volume-averaged porous fluid temperature to 447.6 K.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>What I have tried<\/strong><\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Setting the &#8220;Coupled&#8221; condition on the solid-side wall &mdash; the option does not appear in the Thermal panel.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Using System Coupling &mdash; not applicable, as no external solver is involved.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Creating a mesh interface between solid_heatsink and the porous solid zone, following Ansys document 2056744 (&#8220;three coincident interface zones&#8221;). Manual Create initially did not list zones 158 and 163 because they form a conformal coupled pair.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Splitting the conformal face with <code class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\">\/mesh\/modify-zones\/slit-face-zone<\/code> on zone 158. This succeeded and produced wall_porous_fin and wall_porous_fin-slit as separate zones.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Creating a mesh interface with wall_porous_fin in Boundary Zone List 1 and both wall_porous_fin-slit and wall_porous_fin-shadow:016 in Boundary Zone List 2. Fluent accepted this but assigned the entire intersection to the fluid-side zone, producing wall_porous_fin-shadow:016-non-overlapping with an area of exactly 0 m^2. No heat is transferred to zone 13.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Creating a one-to-one interface between wall_porous_fin and wall_porous_fin-shadow:016 only. The interface is created, but no Coupled wall appears on zone 13 and no heat is transferred.<\/li>\n<\/ol>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Questions<\/strong><\/p>\n<ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Is it possible in Fluent 2025 R2 to transfer heat from an adjacent solid cell zone into the NETM auto-generated porous solid zone? If so, what is the correct procedure?<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Ansys document 2056744 states that heat transfer between the porous solid and adjacent zones is not included in NETM, and also instructs the user to reassign the wall zones of the generated solid zone to interface boundary conditions. These two statements appear to be in tension. Could you clarify which applies to my configuration?<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">If the auto-generated solid zone cannot participate in mesh interfaces by design, is the recommended workaround to create a real duplicate cell zone (e.g. via <code class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\">\/mesh\/modify-zones\/copy-move-cell-zone<\/code>) and implement the interfacial coupling h_sf * a_sf * (T_s &minus; T_f) manually through DEFINE_SOURCE UDFs?<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Does the conformal mesh at the heat sink \/ porous block interface (shared topology from ICEM CFD) prevent this configuration from working? Would a non-conformal mesh at that location resolve the issue?<\/li>\n<\/ol>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">I can provide the case and data files if that would help.<\/p>\n","protected":false},"template":"","class_list":["post-462100","topic","type-topic","status-publish","hentry","topic-tag-porous-media"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am running a conjugate heat transfer simulation in Fluent 2025 R2 in which a CPU heat sink fin array is represented as a porous medium with the Non-Equilibrium Thermal Model (NETM). I cannot transfer heat from the heat sink base into the auto-generated porous solid zone, and would appreciate guidance. 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Model summary Fin block"},"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\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/porous-media\/\" title=\"porous-media\">porous-media<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tNETM porous solid zone: adjacent solid walls default to adiabatic\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":"porous-media","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/porous-media\/"},{"label":"NETM porous solid zone: adjacent solid walls default to adiabatic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/netm-porous-solid-zone-adjacent-solid-walls-default-to-adiabatic\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["462100"],"_bbp_subscription":["715761","684966"],"_bbp_author_ip":[null],"_bbp_last_reply_id":["462107"],"_bbp_last_active_id":["462107"],"_bbp_last_active_time":["2026-08-03 09:01:57"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_engagement":["1","684966"],"_bbp_likes_count":["0"],"_btv_view_count":["37"],"application":["FLUENT"],"emailnotification":[null],"_bbp_topic_status":["unanswered"],"_bbp_voice_count":["2"]},"test":"chlwodnjs99cau-ac-kr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/462100","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\/462100\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=462100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}