{"id":402184,"date":"2024-12-30T12:17:55","date_gmt":"2024-12-30T12:17:55","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-molecular-weight-is-defined-using-incompressible-ideal-gas-in-species-model\/"},"modified":"2024-12-30T12:17:55","modified_gmt":"2024-12-30T12:17:55","slug":"how-molecular-weight-is-defined-using-incompressible-ideal-gas-in-species-model","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-molecular-weight-is-defined-using-incompressible-ideal-gas-in-species-model\/","title":{"rendered":"How molecular weight is defined using incompressible ideal gas in species model?"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone,&lt;\/p&gt;&lt;p&gt;I&#8217;m modeling dispersion of CO in the air. The species model without chemical reaction is used. I have specified the density of mixture material as incompressible ideal gas. The incompressible ideal gas is defined as followed as reference in user guide. However,&nbsp; the &#8220;Mw&#8221;, molecular weight of mixture, is not explicitly defined for users. Anyone konws how the molecular weight is calculated by fluent using incompressible ideal gas law in species model? It&#8217;s not illustrated in user guide nor theory guide.&nbsp;&lt;\/p&gt;&lt;p&gt;Best regards.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/30-12-2024-1735560647-mceclip1.png\" width=\"970\" height=\"466\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-402184","topic","type-topic","status-publish","hentry","topic-tag-fluent","topic-tag-gas-dispersion","topic-tag-incompressible-flow","topic-tag-species-diffusion"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["402184"],"_bbp_subscription":["51510","23673"],"_bbp_author_ip":["58.249.112.28"],"_bbp_last_reply_id":["403096"],"_bbp_last_active_id":["403096"],"_bbp_last_active_time":["2024-12-31 17:51:53"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["51510","23673"],"_btv_view_count":["469"],"_bbp_topic_status":["unanswered"]},"test":"bfdef4e41fe840e99014e0c0ef18055b3cd7380f"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/402184","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\/402184\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=402184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}