{"id":339153,"date":"2023-12-18T17:34:04","date_gmt":"2023-12-18T17:34:04","guid":{"rendered":"\/forum\/forums\/topic\/volume-fraction-problem-when-using-fluent-mixture\/"},"modified":"2023-12-18T17:34:04","modified_gmt":"2023-12-18T17:34:04","slug":"volume-fraction-problem-when-using-fluent-mixture","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/volume-fraction-problem-when-using-fluent-mixture\/","title":{"rendered":"Volume fraction problem when using fluent mixture"},"content":{"rendered":"
Hi all. I found a bug in Fluent.<\/div>\n
I did a simple analysis of a pipe with a diameter of 100 mm and a length of 500 mm.<\/div>\n
I created a mixture of water and methane. The first phase is water, the second is methane. For both phases the density is constant, they are incompressible.<\/div>\n
At the entrance to the pipe I set the pressure to 2 atm. The output is mass flow. The problem is that the flow rate for methane cannot be set correctly.<\/div>\n
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-In total, I must pass 3.7 kg\/s through the pipe.<\/div>\n
-At the inlet, the mixture is set to 2 atm, and for methane, the volume fraction is 0.1 (i.e., 10 percent of the total mixture).<\/div>\n
-At the output, I set the flow rate for water to 3.33 kg\/s and 0.37 for methane (10 percent of 3.7).<\/div>\n
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When calculating, I monitor the graphs on the inlet and outlet surfaces and also make measurements on these surfaces after the solution to check how much mixture, methane and water came in and out.<\/div>\n
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The error is that, as a result of the solution, the water input is 500 kg\/s, methane is 0.037 kg\/s. And there should be 3.33 water and 0.37 methane.<\/strong><\/span>
The output is excellent, the mixture is 3.7 kg\/s, water 0.33, methane 0.37. WHY?<\/strong><\/span>
Thank you.<\/div>\n
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P.S. Screenshots of boundary conditions settings:<\/div>\n
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<\/div>\n","protected":false},"template":"","class_list":["post-339153","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["257647","15180"],"_bbp_author_ip":["23.52.43.16"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["589"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["339153"],"_bbp_forum_id":["27792"],"_bbp_engagement":["15180","257647"],"_bbp_voice_count":["2"],"_bbp_reply_count":["11"],"_bbp_last_reply_id":["343173"],"_bbp_last_active_id":["343173"],"_bbp_last_active_time":["2024-01-04 14:02:15"]},"test":"javat33489gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/339153","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\/339153\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=339153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}