{"id":428349,"date":"2025-04-08T19:20:31","date_gmt":"2025-04-08T19:20:31","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/partially-premixed-combustion-modelling\/"},"modified":"2025-04-08T19:20:31","modified_gmt":"2025-04-08T19:20:31","slug":"partially-premixed-combustion-modelling","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/partially-premixed-combustion-modelling\/","title":{"rendered":"Partially Premixed combustion modelling"},"content":{"rendered":"<p>&lt;p&gt;I am trying to model partially premixed combustion for my burner using FGM with premixed flamelet under Partially premixed combustion modelling section in fluent.&nbsp;&lt;\/p&gt;&lt;p&gt;In my case, both air and fuel streams are separate to each other. Before generation of flamelets, in the boundary section, I have defined mole fraction of the fuel (CH4) as 1 and air is defined as O2 0.21 and N2 0.79.&nbsp; In the boundary conditions section in the fuel stream I have defined mixture fraction value for the decided equivalence ratio value as suggested in fluent user manual.&nbsp;&lt;\/p&gt;&lt;p&gt;Till this points everything is okay. But as soon as I check the contours after running few iterations after initialization, I can see fuel is present in the air steream eventhoough in the boundary section I have defined fuel and air completely separate. This thing is persistent through out the run. I have attached user manual settings screen shot and the burner schematic to have a better understanding of the case setup. <img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/04\/08-04-2025-1744139891-BurnerSchematic.png\" alt=\"Here it is shown there are separate air and fuel lines in the burner. There is mixing tube to mix both air and fuel\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-428349","topic","type-topic","status-publish","hentry","topic-tag-cfd-combustion","topic-tag-fgm","topic-tag-fluent","topic-tag-premixed-combustion","topic-tag-species-transport-model"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["428349"],"_bbp_subscription":["273846","8124","199"],"_bbp_author_ip":["14.139.37.250"],"_bbp_last_reply_id":["428559"],"_bbp_last_active_id":["428559"],"_bbp_last_active_time":["2025-04-10 13:24:06"],"_bbp_reply_count":["11"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["273846","8124","199"],"_btv_view_count":["348"],"_bbp_topic_status":["unanswered"]},"test":"singh-112iitj-ac-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/428349","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\/428349\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=428349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}