{"id":447875,"date":"2025-12-03T12:53:07","date_gmt":"2025-12-03T12:53:07","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/application-of-edc-occurs-flame-extinguishing\/"},"modified":"2025-12-03T12:53:07","modified_gmt":"2025-12-03T12:53:07","slug":"application-of-edc-occurs-flame-extinguishing","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/application-of-edc-occurs-flame-extinguishing\/","title":{"rendered":"Application of EDC occurs flame extinguishing"},"content":{"rendered":"<p>&lt;p&gt;Hello there,&lt;\/p&gt;&lt;p&gt;I am modeling the&nbsp;<a title=\"Sydney combustion database\" href=\"https:\/\/web.aeromech.usyd.edu.au\/thermofluids\/database.php\" target=\"_blank\" rel=\"noopener\">Sydney Needle Spray Burner<\/a> in Fluent with the EDC species transport model using a simplified ethanol mechanism, which could use in Chemkin to simulate 0D\/1D flame.&lt;\/p&gt;&lt;p&gt;I got an EDM intial result, and switched model to EDC, the simulation does not float. But it also occurs the general problem, which extinguishing.&nbsp; Fig. 1 shows the temperature contour of EDM and EDC.&lt;\/p&gt;&lt;p style=&#8221;text-align: center;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/12\/03-12-2025-1764765532-EDC-temp.png\" alt=\"\" width=\"594\" height=\"249\" \/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/12\/03-12-2025-1764765599-EDM-temp.png\" alt=\"\" width=\"623\" height=\"248\" \/>&lt;\/p&gt;&lt;p style=&#8221;text-align: center;&#8221;&gt;EDC result&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EDM result&lt;\/p&gt;&lt;p style=&#8221;text-align: left;&#8221;&gt;I have tried to patch high tempture region, and mass fraction of products, also increased the volume fraction constant to 5, and time scale constant to 3, only few steps after patching, I can see the trend of ignition.&nbsp;&lt;\/p&gt;&lt;p&gt;For turbulence modeling, the k-Omega SST is used. The time step is 1e-6 s.&lt;\/p&gt;&lt;p&gt;I also want to know, becasue of the grids number of injection face, the particles injected into domain is much more, which could reach at 30 million\uff0c its too much and increase the simulation costs.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-447875","topic","type-topic","status-publish","hentry","topic-tag-combustion","topic-tag-fluent-dpm-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["291848"],"_bbp_topic_id":["447875"],"_bbp_author_ip":["109.171.213.119"],"_bbp_last_reply_id":["450693"],"_bbp_last_active_id":["450693"],"_bbp_last_active_time":["2026-01-19 20:03:45"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["1"],"_bbp_voice_count":["2"],"_btv_view_count":["317"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["23673","637367","615890"],"_bbp_engagement":["23673","615890"]},"test":"fanbo9802gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/447875","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\/447875\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=447875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}