{"id":164645,"date":"2023-03-17T08:58:16","date_gmt":"2023-03-17T08:58:16","guid":{"rendered":"\/knowledge\/forums\/topic\/how-does-my-reference-pressure-or-the-pressure-level-in-my-domain-affect-the-force-calculations-on-a-boundary\/"},"modified":"2023-07-31T12:25:59","modified_gmt":"2023-07-31T12:25:59","slug":"how-does-my-reference-pressure-or-the-pressure-level-in-my-domain-affect-the-force-calculations-on-a-boundary","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-does-my-reference-pressure-or-the-pressure-level-in-my-domain-affect-the-force-calculations-on-a-boundary\/","title":{"rendered":"How does my Reference Pressure or the Pressure level in my domain affect the force calculations on a boundary?"},"content":{"rendered":"<p>The force on a boundary is similar to taking the integral of the solution variable &#8220;Pressure&#8221; over the boundary (although it is not calculated this way). Therefore the Reference Pressure does not directly affect the force calculation.   However, if you change your boundary conditions to reflect a change in Reference Pressure then the pressure level in the domain may change and this will alter the force computed on a boundary. Hydrostatic contributions are included in the force since they are included in the variable &#8220;Pressure&#8221;.   If you want to include the Reference Pressure in the forces, then you can set the Expert Parameter &#8220;include pref in forces = t&#8221;. The forces are then similar to the integral of the solution variable &#8220;Absolute Pressure&#8221; over the boundary. Note that forces calculations in CFX will generally also include viscous forces.<\/p>\n","protected":false},"template":"","class_list":["post-164645","topic","type-topic","status-publish","hentry","topic-tag-4424","topic-tag-cfd-post","topic-tag-fluid-dynamics","topic-tag-general"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3-15-2023  20:20:32"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["3024"],"siebel_km_number":["687980"],"product_version":["16"],"km_published_date":["2007-11-30T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFD-Post"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/164645","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\/164645\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=164645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}