{"id":250829,"date":"2023-02-21T16:36:50","date_gmt":"2023-02-21T16:36:50","guid":{"rendered":"\/forum\/forums\/topic\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\/"},"modified":"2023-02-21T16:46:19","modified_gmt":"2023-02-21T16:46:19","slug":"mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\/","title":{"rendered":"Mesh independence study using a transient DPM model for natural ventilation"},"content":{"rendered":"<p>I am using a DPM fluent model with injections at a surface inlet to simulate particle injections throught a vent downstream to replecae particles in air. I am using a transient case K-omega SST witha inlet velocity of 2.5ms. My problem is that im having difficulting completing a mesh independance study as my results vary too much. Should I complete the refinment as steady case instead? Im using a report definition to record the DPM concentration on a iso clipped plane at the vent entrance to calculate the ratio of DPM concentrations passing through the vent compared to the amount at the injection surface, this ratio is the value im trying to investigate as I carry a my mesh refinement. But I cannot seem to get a mesh that has a less than 1% change compared to the prior value.&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Any insight would be greatly appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-250829","topic","type-topic","status-closed","hentry","topic-tag-dpm","topic-tag-grid-independency-test","topic-tag-steady-state"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am using a DPM fluent model with injections at a surface inlet to simulate particle injections throught a vent downstream to replecae particles in air. I am using a transient case K-omega SST witha inlet velocity of 2.5ms. My problem is that im having difficulting completing a mesh independance study as my results vary\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\/\" \/>\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=\"Mesh independence study using a transient DPM model for natural ventilation | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am using a DPM fluent model with injections at a surface inlet to simulate particle injections throught a vent downstream to replecae particles in air. I am using a transient case K-omega SST witha inlet velocity of 2.5ms. My problem is that im having difficulting completing a mesh independance study as my results vary\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-02-21T16:36:50+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-02-21T16:46:19+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Mesh independence study using a transient DPM model for natural ventilation | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am using a DPM fluent model with injections at a surface inlet to simulate particle injections throught a vent downstream to replecae particles in air. I am using a transient case K-omega SST witha inlet velocity of 2.5ms. My problem is that im having difficulting completing a mesh independance study as my results vary\" \/>\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\\\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\\\/#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\\\/dpm\\\/#listItem\",\"name\":\"dpm\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/dpm\\\/#listItem\",\"position\":3,\"name\":\"dpm\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/dpm\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\\\/#listItem\",\"name\":\"Mesh independence study using a transient DPM model for natural ventilation\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\\\/#listItem\",\"position\":4,\"name\":\"Mesh independence study using a transient DPM model for natural ventilation\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/dpm\\\/#listItem\",\"name\":\"dpm\"}}]},{\"@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\\\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mesh-independence-study-using-a-transient-dpm-model-for-natural-ventilation\\\/\",\"name\":\"Mesh independence study using a transient DPM model for natural ventilation | Ansys Learning Forum\",\"description\":\"I am using a DPM fluent model with injections at a surface inlet to simulate particle injections throught a vent downstream to replecae particles in air. 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