{"id":296092,"date":"2023-08-02T12:15:18","date_gmt":"2023-08-02T12:15:18","guid":{"rendered":"\/forum\/forums\/topic\/how-is-volume-weight-average-defined-in-fluent-for-multiphase\/"},"modified":"2023-08-02T12:15:18","modified_gmt":"2023-08-02T12:15:18","slug":"how-is-volume-weight-average-defined-in-fluent-for-multiphase","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-is-volume-weight-average-defined-in-fluent-for-multiphase\/","title":{"rendered":"how is volume-weight average defined in FLUENT for multiphase?"},"content":{"rendered":"<p>I have a multiphase problem, and am checking mass- and volume-weight average definition.&nbsp;<\/p>\n<p>In Theory Guide, mass average is below, and explitcitly say rho_i is the mixture density. In this case, V_i is clearly to be the total volume.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/02-08-2023-1690978287-mceclip4.png\" width=\"192\" height=\"140\"><\/p>\n<p>the volume aveage is blow. Is V_i the total volume also? If so, I do not understand&#8230;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/02-08-2023-1690977390-mceclip1.png\" width=\"227\" height=\"75\"><\/p>\n<p>If we consider a variable in phase k in a multiphase problme. Shouldn&#8217;t we consider the phase fraction? Namely the following equations?&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/02-08-2023-1690977861-mceclip2.png\"> and <img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/02-08-2023-1690978069-mceclip3.png\"><\/p>\n<p>Even if we take one step back for the average of the total volume, the phase fraction should still be in the numerator, isn&#8217;t it?&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-296092","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have a multiphase problem, and am checking mass- and volume-weight average definition. In Theory Guide, mass average is below, and explitcitly say rho_i is the mixture density. In this case, V_i is clearly to be the total volume.the volume aveage is blow. Is V_i the total volume also? 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