{"id":51821,"date":"2021-02-02T04:45:45","date_gmt":"2021-02-02T04:45:45","guid":{"rendered":"\/forum\/forums\/topic\/mass-fraction-udf\/"},"modified":"2021-02-02T04:45:45","modified_gmt":"2021-02-02T04:45:45","slug":"mass-fraction-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mass-fraction-udf\/","title":{"rendered":"mass fraction UDF"},"content":{"rendered":"<p>Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\/*******************************************************************************\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn\u00a0double mh, mc, fh, fc;nn\u00a0real x[ND_ND];n\u00a0face_t f;n\u00a0Thread *t0, *t1;n\u00a0cell_t c0, c1;nn\u00a0begin_f_loop(f, thread)n\u00a0{nn\u00a0c0 = F_C0(f, thread);n\u00a0t0 = THREAD_T0(thread);n\u00a0c1 = F_C1(f, thread);n\u00a0t1 = THREAD_T1(thread);nn\u00a0\u00a0fh\u00a0= C_YI(c0, t0, 0);n\u00a0\u00a0fc\u00a0= C_YI(c1, t1, 0);nn\u00a0\u00a0mh\u00a0= fh*0.95;n\u00a0\u00a0mc\u00a0= fc+fh-mh;\u00a0F_PROFILE(f, thread, position)= mh;nn\u00a0}n\u00a0end_f_loop(f, thread)nn}\/*******************************************************************************\/nn\u00a0fc\u00a0= C_YI(c1, t1, 0);n\u00a0mc\u00a0= fc+fh-mh;nThis is making problem when i remove both from the above, this UDF runs. As per given equation, I have to first define mass fraction on shadow surface which is Fc. Am I doing anything wrong? nPlease guide me seniors.nnRegards,nAbbas Razann<\/p>\n","protected":false},"template":"","class_list":["post-51821","topic","type-topic","status-closed","hentry","topic-tag-mass-fraction","topic-tag-udf","topic-tag-udf-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["24096"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["*?q?"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["918"],"_bbp_subscription":["231350"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["51821"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","183751","184487","185345"],"_bbp_voice_count":["5"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["142700"],"_bbp_last_active_id":["142700"],"_bbp_last_active_time":["2021-02-17 14:04:12"]},"test":"abbasraza20000220"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/51821","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\/51821\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=51821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}