{"id":398163,"date":"2024-12-20T23:36:26","date_gmt":"2024-12-20T23:36:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/extracting-amount-of-sediment-mass-passing-through-line-surface\/"},"modified":"2024-12-20T23:36:26","modified_gmt":"2024-12-20T23:36:26","slug":"extracting-amount-of-sediment-mass-passing-through-line-surface","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/extracting-amount-of-sediment-mass-passing-through-line-surface\/","title":{"rendered":"Extracting Amount of Sediment Mass Passing through Line Surface"},"content":{"rendered":"<p>&lt;p&gt;Hi, I am currently modeling slurry multiphase flow through a 2D pipe. The pipe has a drop tube in the middle to capture the sand (secondary phase). To analyze the result, I need to know how much sand enter the intersection (before_dt), fall into the drop tube (into_dt), and exit the intersection (after_dt) in order to understand the efficiency of the system in capturing sand.&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/20-12-2024-1734737203-mceclip0.png\" width=\"717\" height=\"265\" \/>&lt;\/p&gt;&lt;p&gt;I used Surface Integrals -&gt; Mass Flow Rate on sand phase to extract the result, however I doubt the values are correct. The Mass Flow Rate is showing negative values for before_dt and into_dt lines, and also the magnitude of into_dt is larger than before_dt, is it possible? The volume fraction countour somehow is looking fine.&lt;\/p&gt;&lt;p&gt;Did I do anything wrong on extracting the sand amount? I am sorry if the question and data provided are not clear enough.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/20-12-2024-1734737454-mceclip1.png\" width=\"1367\" height=\"511\" \/>&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-398163","topic","type-topic","status-publish","hentry","topic-tag-fluent"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi, I am currently modeling slurry multiphase flow through a 2D pipe. The pipe has a drop tube in the middle to capture the sand (secondary phase). 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