{"id":460374,"date":"2026-06-25T23:03:27","date_gmt":"2026-06-25T23:03:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/set-species-composition-at-boundaries-with-the-tui-for-journal-files\/"},"modified":"2026-06-25T23:03:27","modified_gmt":"2026-06-25T23:03:27","slug":"set-species-composition-at-boundaries-with-the-tui-for-journal-files","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/set-species-composition-at-boundaries-with-the-tui-for-journal-files\/","title":{"rendered":"Set Species Composition at Boundaries with the TUI for Journal Files"},"content":{"rendered":"<p>&lt;p&gt;I&#8217;m trying to learn how journal files work in Fluent and I&#8217;m going with the tactic of using the GUI to setup the whole simulation and then using the journal file to tweak settings during runtime if I want something about the settings to change automatically. This will definitely make running my simulations on an HPC way less of a headache. However, I&#8217;ve hit a snag when it comes to setting species boundary conditions with the TUI window when I&#8217;m using a large chemical mechanism:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/25-06-2026-1782428318-mceclip0.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/25-06-2026-1782428357-mceclip1.png\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/06\/25-06-2026-1782428380-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;Fluent forces me to go down the whole list of species instead of being able to choose just the specifc ones I want to set. This chemical mechanism only has 31 species and it&#8217;s already a chore trying to go down the list, nevermind trying to type out the full sequence in a journal file. Is there a way to be more targeted with the species boundary conditions with TUI commands and journal?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-460374","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["460374"],"_bbp_subscription":["302346","199842","199"],"_bbp_author_ip":["149.149.2.215"],"_bbp_last_reply_id":["460393"],"_bbp_last_active_id":["460393"],"_bbp_last_active_time":["2026-06-26 08:27:45"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["302346","199842","199"],"_btv_view_count":["32"],"_bbp_topic_status":["unanswered"]},"test":"abtharpe42tntech-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/460374","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\/460374\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=460374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}