{"id":30298,"date":"2018-09-04T20:21:12","date_gmt":"2018-09-04T20:21:12","guid":{"rendered":"\/forum\/forums\/topic\/uds-specified-flux-bc\/"},"modified":"2018-09-04T20:21:12","modified_gmt":"2018-09-04T20:21:12","slug":"uds-specified-flux-bc","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/uds-specified-flux-bc\/","title":{"rendered":"UDS Specified Flux BC"},"content":{"rendered":"<p><span style=\"font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;\">I am trying to solve the transport equation for a UDS (which is the number of particles, no units).&nbsp; The medium is stagnant water, so the convective term is zero.&nbsp; I have one boundary from where the particles are released, which is specified as number of particles released per unit area per unit time (which is the flux). &nbsp;<\/p>\n<p> According to Chapter 8 of the Users manual, the boundary flux is specified as the diffusion coefficient multiplied by the normal component of the gradient of UDS.&nbsp; When we consider the units (say SI system), diffusion coefficient is kg\/(m s) and gradient is (number per m).&nbsp; Therefore, the flux at the BC has the unit (number * kg\/(m^2 s), not number\/ (m^2 s). &nbsp;<\/p>\n<p> What should be the units in which I need to specify the UDS flux at the boundary?&nbsp; In my case UDS is the number of particle. <\/p>\n<p> Thank you in advance for your help.<br \/> <!-- [if !supportLineBreakNewLine]--><br \/> <!--[endif]--><\/span><\/p>\n","protected":false},"template":"","class_list":["post-30298","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["2467"],"_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","0","0","0"],"_btv_view_count":["2631"],"_bbp_subscription":["237004"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["30298"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","199","22555","81187","157272","176625"],"_bbp_voice_count":["6"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["115798"],"_bbp_last_active_id":["115798"],"_bbp_last_active_time":["2020-05-27 02:53:38"]},"test":"koomullil"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30298","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\/30298\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=30298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}