{"id":403966,"date":"2025-01-07T17:04:45","date_gmt":"2025-01-07T17:04:45","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-udf\/"},"modified":"2025-01-07T17:04:45","modified_gmt":"2025-01-07T17:04:45","slug":"rocky-udf","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-udf\/","title":{"rendered":"Rocky UDF"},"content":{"rendered":"<p>&lt;p&gt;Hello,&nbsp;&lt;\/p&gt;&lt;p&gt;I am trying to write a udf function for Rocky which particle size reduces over time based an equation. kco and Csat are the inputs of the model. if i add kco value 0.01 it works without any problem. But if i choose a very small value like 1e-14 for kco. all the parameters i wan calculate are either zero or without anychange and therfore there is no mass or volume change. I wrote the code based on the transient szie scale module which is one of the ready to use ones.&nbsp;&lt;\/p&gt;&lt;p&gt;Can you please help me with it ?&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/07-01-2025-1736269162-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403966","topic","type-topic","status-publish","hentry","topic-tag-rocky-dem-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["403966"],"_bbp_subscription":["57165","199"],"_bbp_author_ip":["137.99.69.128"],"_bbp_last_reply_id":["404457"],"_bbp_last_active_id":["404457"],"_bbp_last_active_time":["2025-01-10 15:08:18"],"_bbp_reply_count":["13"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["57165","199"],"_btv_view_count":["252"],"_bbp_topic_status":["unanswered"]},"test":"98fda2c5151906a025703ec623e093a5a38a4681"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403966","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\/403966\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=403966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}