{"id":369838,"date":"2024-06-04T18:46:54","date_gmt":"2024-06-04T18:46:54","guid":{"rendered":"\/forum\/forums\/topic\/fluent-combustion-problem\/"},"modified":"2024-06-04T18:46:54","modified_gmt":"2024-06-04T18:46:54","slug":"fluent-combustion-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-combustion-problem\/","title":{"rendered":"Fluent Combustion Problem"},"content":{"rendered":"<p>Hello, is there someone experimented in combustion simulations who can help me please ?<\/p>\n<p><span style=\"text-decoration: underline\">Simulation 1 :<\/span> I made a methane &#8211; air combustion which worked perfectly. The geometry was with a bluff between the air and the fuel inlet.<\/p>\n<p><span style=\"text-decoration: underline\">Simulation 2 :&nbsp;<\/span> Same as Simulation 1, I just removed the bluff (so now I have 2 parallel pipes for the inlets), but now <strong>there is no combustion occuring<\/strong>.<\/p>\n<p><span style=\"text-decoration: underline\">Here are the parameters of the simulations :<\/span><br \/>I&#8217;m doing a steady 2D axisymmetric simulation, of methane &#8211; air combustion.<br \/>Using Species Transport model, with Gri-Mechanism and EDC<br \/>Standard k-e model for turbulence, and adiabatic walls.<\/p>\n<p>For the simulation 1 with the bluff, I obtained an ignition after putting a wall on the bluff at 2000K. But when I remove the bluff (Simulation 2) , even setting a wall at 2000K between air inlet and fuel inlet doesn&#8217;t work.<\/p>\n<p>When I patch a high temperature, or species at 0.01 before or during the simulation, I still don&#8217;t have ignition. Same if I put the air and fuel inlet at 1300K, the results aren&#8217;t good.<br \/>When I use Eddy Dissipation model it also doesn&#8217;t work.<\/p>\n<p>Can someone help me please ?<\/p>\n<p><em>I think that&#8217;s a problem of turbulence. EDC needs a minimum of turbulences to starts chemical reactions. With the bluff geometry, enough turblences were created, but when I remove the bluff, there are maybe not enough turbulences to start the reactions ?<\/em><\/p>\n<p>Thank you very much for helping.<\/p>\n<p>[Pictures of Bluff and no bluff geometries] :<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/06\/04-06-2024-1717526804-mceclip3.png\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/06\/04-06-2024-1717526769-mceclip2.png\"><\/p>\n","protected":false},"template":"","class_list":["post-369838","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["110805","199","14415"],"_bbp_author_ip":["184.24.96.207"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1147"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["369838"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","14415","110805"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["372710"],"_bbp_last_active_id":["372710"],"_bbp_last_active_time":["2024-07-19 10:28:58"]},"test":"felix512hotmail-fr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369838","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\/369838\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}