Hi,<\/p>\n
I’m running a 3D transient simulation using the Partially Premixed Combustion Non-adibatic FGM model.<\/p>\n
I want to capture the auto-ignition of a hot gas mixture jet. Is there a way to capture auto-ignition with the FGM model?<\/span><\/p>\n I also have issues with the heat release rate value computed using a Volume-Integral on my domain (From PDF>Heat Release Rate). The value is often negative even when a flame is present. Thank you,<\/p>\n","protected":false},"template":"","class_list":["post-372444","topic","type-topic","status-closed","hentry","topic-tag-autoignition-1","topic-tag-combustion","topic-tag-fgm","topic-tag-heat-release"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["62474","14415"],"_bbp_author_ip":["132.207.70.184"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["455"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["372444"],"_bbp_forum_id":["27792"],"_bbp_engagement":["14415","62474"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["387029"],"_bbp_last_active_id":["387029"],"_bbp_last_active_time":["2024-09-25 19:41:10"]},"test":"mathieu-goureaupolymtl-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/372444","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\/372444\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=372444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
I’m initializing my domain with a mixture fraction and progress variable at 0.
A mass-flow inlet is used to create the jet, the temperature is fixed (800°C) and the mixture fraction is set to 1. I don’t observe any ignition unless I’m patching the progress variable or adding a spark<\/span><\/p>\n
According to the User’s Guide (p4200), the HRR is the source term defined in eq 5.11 of the Theory Guide. However, the Theory Guide states that when using the non-adiabatic non-premixed combustion model the reaction sources of energy are not included in Eq 5.11. So what hat is Fluent computing as the heat release rate?<\/p>\n