{"id":390679,"date":"2024-10-21T15:01:51","date_gmt":"2024-10-21T15:01:51","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/passive-scalar-mixing-using-uds-to-track-tracer-in-batch-mixing-tank\/"},"modified":"2024-10-23T12:15:37","modified_gmt":"2024-10-23T12:15:37","slug":"passive-scalar-mixing-using-uds-to-track-tracer-in-batch-mixing-tank","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/passive-scalar-mixing-using-uds-to-track-tracer-in-batch-mixing-tank\/","title":{"rendered":"Passive Scalar Mixing: Using UDS To Track Tracer In Batch Mixing Tank"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I want to simulate mixing of a tracer in liquid (using a passive scalar) in a stirred tank reactor. The reactor is operated in batch (no inlets or outlets) with two phases (air &amp; water) which form a distinct interface, known as a vortex, where mixing will only be performed in the liquid phase.&lt;\/p&gt;&lt;p&gt;&lt;\/p&gt;&lt;p&gt;The tracer will be injected on the interface between the phases (for the experiment a plume was introduced, operated in batch mode).&lt;\/p&gt;&lt;p&gt;Having read some online material, it has been suggested to activate a UDS and solve one scalar transport equation. However, for a UDS to work a boundary condition (BC) must be defined such as an inlet. In my domain, batch reactor, I only have BC&#8217;s for the solid walls (&#8220;no-slip&#8221;) and the top of the reactor (&#8220;free-slip&#8221;). How would I be able to use the UDS without an inlet BC in the tank to introduce the tracer?&lt;\/p&gt;&lt;p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390679","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["282802","199"],"_bbp_author_ip":["194.80.232.16"],"_btv_view_count":["373"],"_bbp_topic_status":["unanswered"],"_edit_last":["282802"],"_bbp_revision_log":["a:1:{i:391045;a:2:{s:6:\"author\";i:282802;s:6:\"reason\";s:0:\"\";}}"],"_bbp_topic_id":["390679"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","282802"],"_bbp_voice_count":["2"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["390810"],"_bbp_last_active_id":["390810"],"_bbp_last_active_time":["2024-10-22 11:13:56"]},"test":"ll17s5rleeds-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390679","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390679\/revisions"}],"predecessor-version":[{"id":391045,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390679\/revisions\/391045"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=390679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}