{"id":169835,"date":"2022-05-26T18:15:00","date_gmt":"2022-05-26T18:15:00","guid":{"rendered":"\/forum\/forums\/topic\/how-do-i-input-diffusion-coefficient\/"},"modified":"2022-05-26T18:15:00","modified_gmt":"2022-05-26T18:15:00","slug":"how-do-i-input-diffusion-coefficient","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-do-i-input-diffusion-coefficient\/","title":{"rendered":"How do I input diffusion coefficient?"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/084\/4YIQFVUJPONM.jpg\" width=\"593\" height=\"870\" \/>I would like to change the diffusion coefficient of a fluid to model a species diffusion through a membrane. In the above image, the material window shows that there is no diffusion coefficient parameter on the materials database.<br \/>\nHowever, the handbook specifies that there should be a diffusion coefficient parameter to modify. Section 7.9.5. specifies &#8220;You will define\u00a0or\u00a0for each chemical species using the Create\/Edit Materials Dialog Box. \u00a0Setup \u2192\u00a0\u00a0Materials.  The diffusion coefficients have units of \/s in SI units or \/s in British units.&#8221;<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/472\/VAT243HOE0E7.jpg\" width=\"1630\" height=\"766\" \/><br \/>\nHow do I input the parameters?<br \/>\nI have previously tried to simply alter the molecular weight and L-J characteristic length of the material, as these are components of the Einstein diffusion coefficient. However, altering these parameters had no impact on the diffusion rate in my simulation.<\/p>\n<p>Thank you!<\/p>\n","protected":false},"template":"","class_list":["post-169835","topic","type-topic","status-closed","hentry","topic-tag-diffusion-coefficient-1","topic-tag-Fickiandiffusion-1","topic-tag-material","topic-tag-multicomponentdiffusion-1","topic-tag-species-diffusion"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["1661"],"_bbp_likes_count":["0"],"_bbp_subscription":["910","15977"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["169835"],"_bbp_forum_id":["27792"],"_bbp_engagement":["910","15977"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["217176"],"_bbp_last_active_id":["217176"],"_bbp_last_active_time":["2022-06-29 10:45:46"]},"test":"zdfrankmanemail-arizona-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/169835","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\/169835\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=169835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}