{"id":34062,"date":"2019-03-19T17:55:13","date_gmt":"2019-03-19T17:55:13","guid":{"rendered":"\/forum\/forums\/topic\/how-to-compute-mixture-fraction-at-each-node-in-a-turbulent-combustion-reactor-model\/"},"modified":"2019-03-19T17:55:13","modified_gmt":"2019-03-19T17:55:13","slug":"how-to-compute-mixture-fraction-at-each-node-in-a-turbulent-combustion-reactor-model","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-compute-mixture-fraction-at-each-node-in-a-turbulent-combustion-reactor-model\/","title":{"rendered":"How to compute mixture fraction at each node in a turbulent combustion reactor model?"},"content":{"rendered":"<p>I need to calculate the spatially-resolved mixture fractions (with respect to both fuel and oxidizer) in a turbulent combustion chamber. The mixture fraction is defined as the mass originating from a single stream (usual fuel) over the total mass in a volume. This should be a fairly simple task, but a good portion of elemental C and O are also coming from diluent streams throughout the combustor. The chemical compositions of each stream, specifically, are fuel: CH4, oxid: O2, and diluent: CO2. I want to find specifically the fuel and oxidizer contribution to the mixture composition at each node. I believe mixture fraction is a built-in output in Chemkin but not Fluent.<\/p>\n<p><\/p>\n<p>If I have to calculate it manually, even if I neglect species diffusion, I still have more than 10 chemical species&#8211;way too many unknowns to&nbsp;calculate the mixture fractions from just mole and mass fraction outputs.<\/p>\n<p><\/p>\n<p>Is there a way to compute the mixture fraction&nbsp;for such a model?<\/p>\n","protected":false},"template":"","class_list":["post-34062","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["6234"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["1216"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["34062"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13922","163620"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["81070"],"_bbp_last_active_id":["81070"],"_bbp_last_active_time":["2019-03-21 18:11:55"]},"test":"lslxao"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/34062","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\/34062\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=34062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}