{"id":157264,"date":"2022-06-06T08:33:17","date_gmt":"2022-06-06T08:33:17","guid":{"rendered":"\/knowledge\/forums\/topic\/if-solve-momentum-is-disabled-in-the-eulerian-wall-film-model-is-the-film-velocity-still-evaluated-as-non-zero-2\/"},"modified":"2022-06-06T08:33:17","modified_gmt":"2022-06-06T08:33:17","slug":"if-solve-momentum-is-disabled-in-the-eulerian-wall-film-model-is-the-film-velocity-still-evaluated-as-non-zero-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/if-solve-momentum-is-disabled-in-the-eulerian-wall-film-model-is-the-film-velocity-still-evaluated-as-non-zero-2\/","title":{"rendered":"If &#8220;Solve Momentum&#8221; is disabled in the Eulerian Wall Film model, is the film velocity still evaluated as non-zero?"},"content":{"rendered":"<p>When the &#8220;Solve Momentum&#8221; is enabled in the Eulerian Wall Film model, the average film velocity is obtained by solving a momentum conservation equation for the film. If the &#8220;Solve Momentum&#8221; is disabled, the film velocity is evaluated based on two driving forces for the film flow, namely <br \/> 1. Shear due to external flow: A linear velocity profile is assumed within the film thickness, from wall to air-film interface and zero-jump condition of shear stress is applied to evaluate the film velocity. <br \/> 2. Gravity force: A parabolic profile is assumed within the film thickness from wall to the air-film interface and the gravity forces is balanced with the wall shear force.<\/p>\n","protected":false},"template":"","class_list":["post-157264","topic","type-topic","status-publish","hentry","topic-tag-ansys-fluent","topic-tag-eulerian-wall-film","topic-tag-ewf"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"When the &quot;Solve Momentum&quot; is enabled in the Eulerian Wall Film model, the average film velocity is obtained by solving a momentum conservation equation for the film. If the &quot;Solve Momentum&quot; is disabled, the film velocity is evaluated based on two driving forces for the film flow, namely 1. 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If the &quot;Solve Momentum&quot; is disabled, the film velocity is evaluated based on two driving forces for the film flow, namely 1. 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