{"id":393918,"date":"2024-11-14T22:08:06","date_gmt":"2024-11-14T22:08:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\/"},"modified":"2024-11-14T22:08:06","modified_gmt":"2024-11-14T22:08:06","slug":"fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\/","title":{"rendered":"FLUENT | Mass flow-rate report at inlet surface different to the specified value"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I am trying to solve a species transport model (no reactions) coupled with LES k-equation. I have a fuel jet in the middle and a surrounding oxidisier co-flow. The upstream section of the fuel jet includes a converging nozzle. The fuel jet inlet is specified as a mass flow inlet.&lt;\/p&gt;&lt;p&gt;I am using PISO with the Ideal Gas law used as the equation of state.&nbsp;&lt;\/p&gt;&lt;p&gt;I have specified the mass flow rate at the fuel-jet inlet, and I am monitoring the mass flow rate at the inlet surface using a surface report. The following plot of this surface monitor (Actual) plotted along with the specified value at the inlet boundary (Target). The total temperature was calculated assuming isentropic conditions. The inlet mach number is very small so the total temp is equal to the static temp.&nbsp;&lt;br&gt;&lt;br&gt;Why is the actual value different from the specified value?&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/14-11-2024-1731621952-mceclip2.png\" \/>&lt;br&gt;&lt;br&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393918","topic","type-topic","status-publish","hentry","topic-tag-fluent-cfd-ansys-1"],"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 trying to solve a species transport model (no reactions) coupled with LES k-equation. I have a fuel jet in the middle and a surrounding oxidisier co-flow. The upstream section of the fuel jet includes a converging nozzle. The fuel jet inlet is specified as a mass flow inlet.I am using PISO with the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"FLUENT | Mass flow-rate report at inlet surface different to the specified value | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi,I am trying to solve a species transport model (no reactions) coupled with LES k-equation. I have a fuel jet in the middle and a surrounding oxidisier co-flow. The upstream section of the fuel jet includes a converging nozzle. The fuel jet inlet is specified as a mass flow inlet.I am using PISO with the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-14T22:08:06+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-14T22:08:06+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"FLUENT | Mass flow-rate report at inlet surface different to the specified value | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi,I am trying to solve a species transport model (no reactions) coupled with LES k-equation. I have a fuel jet in the middle and a surrounding oxidisier co-flow. The upstream section of the fuel jet includes a converging nozzle. The fuel jet inlet is specified as a mass flow inlet.I am using PISO with the\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#cfd-#ansys\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"position\":3,\"name\":\"#fluent-#cfd-#ansys\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\\\/#listItem\",\"name\":\"FLUENT | Mass flow-rate report at inlet surface different to the specified value\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\\\/#listItem\",\"position\":4,\"name\":\"FLUENT | Mass flow-rate report at inlet surface different to the specified value\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#cfd-#ansys\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fluent-mass-flow-rate-report-at-inlet-surface-different-to-the-specified-value\\\/\",\"name\":\"FLUENT | Mass flow-rate report at inlet surface different to the specified value | Ansys Learning Forum\",\"description\":\"Hi,I am trying to solve a species transport model (no reactions) coupled with LES k-equation. 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