{"id":166055,"date":"2023-03-17T13:10:55","date_gmt":"2023-03-17T13:10:55","guid":{"rendered":"\/knowledge\/forums\/topic\/how-do-i-set-a-fixed-velocity-in-a-cell-zone\/"},"modified":"2023-07-31T12:27:13","modified_gmt":"2023-07-31T12:27:13","slug":"how-do-i-set-a-fixed-velocity-in-a-cell-zone","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-i-set-a-fixed-velocity-in-a-cell-zone\/","title":{"rendered":"How do I set a fixed velocity in a cell zone?"},"content":{"rendered":"<p>When using the &#8220;fixed values&#8221; option for a cell zone in Fluent, velocity will usually remain fixed, but will diverge in some cases. By giving a momentum source, you can achieve a more stable calculation. The procedure is explained below:  1. Separate the cell zone you want to fix the velocity either in meshing or in Fluent   2. In Fluent, click Define\uf0e0Cell Zone Conditions and edit the require cell zone.  Set Source Terms\uf0e0X Momentum (x-if you want to fix the x-velocity)  Use the following formula: M = U \u00b7 U \u00b7 S \u00b7  \u03c1 \/ V   U = Velocity you want to fix S = The cross-sectional area of the cell zone (m^2) \u03c1 = Density of the fluid (kg\/m^3) V = Volume of the cell zone (m^3) M = Momentum source (N\/M^3) <\/p>\n<p>Attachments:<br \/>\n1. <a href=https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2042074\/2042074.pdf>2042074.pdf<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166055","topic","type-topic","status-publish","hentry","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-general-fluent","topic-tag-generic"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3-15-2023  20:20:51"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["2782"],"siebel_km_number":["2042074"],"product_version":[""],"km_published_date":["2016-04-25T20:48:25.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"solution"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166055","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166055\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=166055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}