{"id":36413,"date":"2019-07-08T16:06:07","date_gmt":"2019-07-08T16:06:07","guid":{"rendered":"\/forum\/forums\/topic\/multiphase-model-bioreactor\/"},"modified":"2019-07-08T16:06:07","modified_gmt":"2019-07-08T16:06:07","slug":"multiphase-model-bioreactor","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/multiphase-model-bioreactor\/","title":{"rendered":"Multiphase model &#8211; Bioreactor"},"content":{"rendered":"<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">Hello,<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">I&#8217;m trying to simulate the fluid dynamics in a mixing bioreactor. <\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">&nbsp;I have a sparger with 35 holes (6mm) embedded in the liquid phase which is necessary to guarantee the supply of oxygen. To model the air supply, I am using the velocity inlet as boundary condition on the surface of the holes. I am using the MRF approach to solve the rotation of the impellers.<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">Since it is necessary to use a multiphase model (water and air), I would like to ask you: which is the correct model among the Euler-Euler Approaches? (Vof, eulerian, mixture). What&rsquo;s the motivation? The liquid volume in the reactor is 3 m^3 and the volumetric flow rate is 3 m^3\/min, so the velocity inlet for each hole is 50.5 m\/s.<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">Reviewing the guide and the literature, it seems like none of these models can&rsquo;t track individual air particles unlike the Euler-Lagrange approach. Can you confirm and provide some explanations? <\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">In other words, should I not expect to see individual air bubbles when using the Euler-Euler approach and any of the three models? Once again, what is the motivation?<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-GB\" style=\"font-size: 12.0pt; line-height: 107%; mso-ansi-language: EN-GB;\">Thank you<\/span><\/p>\n","protected":false},"template":"","class_list":["post-36413","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["8585"],"_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"],"_btv_view_count":["918"],"_bbp_subscription":["241260"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["36413"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","164325","166600","186585"],"_bbp_voice_count":["5"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["145845"],"_bbp_last_active_id":["145845"],"_bbp_last_active_time":["2021-03-11 06:20:02"]},"test":"simone01"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/36413","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\/36413\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=36413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}