{"id":29828,"date":"2018-07-27T13:01:22","date_gmt":"2018-07-27T13:01:22","guid":{"rendered":"\/forum\/forums\/topic\/fluent-reports-how-to-calculate-the-mass-of-fluid-in-a-tank\/"},"modified":"2018-07-27T13:01:22","modified_gmt":"2018-07-27T13:01:22","slug":"fluent-reports-how-to-calculate-the-mass-of-fluid-in-a-tank","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-reports-how-to-calculate-the-mass-of-fluid-in-a-tank\/","title":{"rendered":"Fluent Reports: How to calculate the mass of fluid in a tank?"},"content":{"rendered":"<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Hi, <\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">I need to simulate a tank filling with an electrolyte (incompressible). Initially the tank is filled with air (ideal gas). Through a pressure difference at a pressure inlet, the electrolyte flows in the tank compressing the air, there is no outlet.<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">After a certain flow time I want to calculate the mass of electrolyte in the tank.<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">I have used two different approaches:<\/span><\/p>\n<p><\/p>\n<ul><\/p>\n<li class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\"><span style=\"mso-list: Ignore;\"><span style=\"font: 7.0pt 'Times New Roman';\">&nbsp;<\/span><\/span><\/span><!--[endif]--><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Report Definitions&gt;Flux Report&gt; Mass Flow Rate on Inlet Boundary (attached figure). To approximate the area under the time depended data points I used trapezoidal rule to get the mass.<\/span><\/li>\n<p><\/p>\n<li class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"mso-list: Ignore;\"><span style=\"font: 7.0pt 'Times New Roman';\">&nbsp;<\/span><\/span><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Results&gt;Reports&gt;Volume Integrals&gt;Mass (Integration of phase volume fraction)<\/span><\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"text-indent: -18.0pt; line-height: normal; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt; vertical-align: middle; margin: 0cm 0cm .0001pt 27.0pt;\">&nbsp;<\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Comparing the calculated mass, I have 10% deviation between the two methods. <\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\">Which approach calculating mass would you recommend as more accurate?<\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Or might the difference be a sign of mistakes in the simulation?<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span lang=\"EN-GB\" style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-GB;\">Best regards<\/span><\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\">&nbsp;<\/p>\n<p><\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;\"><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d79b70c6-07c7-4653-b13d-a91800800ef7\/6f936583-0027-42d3-b84c-a92a00d60c5c_mass-flow-rate.jpg?width=690&amp;upscale=false\" alt=\"mass flow rate vs. flow time\"> <\/span><\/p>\n","protected":false},"template":"","class_list":["post-29828","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["1997"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["1651"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["29828"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","157440","157683"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["61093"],"_bbp_last_active_id":["61093"],"_bbp_last_active_time":["2018-07-29 18:40:53"]},"test":"student_18"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/29828","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\/29828\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=29828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}