{"id":445717,"date":"2025-11-06T00:47:56","date_gmt":"2025-11-06T00:47:56","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\/"},"modified":"2025-11-06T00:47:56","modified_gmt":"2025-11-06T00:47:56","slug":"keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\/","title":{"rendered":"Keeping concentration same for different sized particles in discrete phase model"},"content":{"rendered":"<p>&lt;p&gt;I am doing a dpm injection from one side of a cylinder towards the other side in the axial direction. i currently start with particles of 300 nm diameter and then want to inject other different sized particles ( 5 micron, 10 micron, 30 micron etc). I make the wall as trap boundary to try and see how many particles get trapped for different sizes. To make a proper comparison I want to keep the concentration of particles injected-constant. The solid fraction for the particles when compared to the whole volume of fluid that is flowing is 7%.&lt;\/p&gt;&lt;p&gt;My question is, given the solid fraction will be 7%, how do I keep the concentration of particles the same for particles of different diameters? For both steady state and transient study.&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-445717","topic","type-topic","status-publish","hentry","topic-tag-dpm","topic-tag-dpm-injection","topic-tag-dpm-tracking","topic-tag-fluidflowfluent-1","topic-tag-steady-state","topic-tag-unsteady-flow-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am doing a dpm injection from one side of a cylinder towards the other side in the axial direction. i currently start with particles of 300 nm diameter and then want to inject other different sized particles ( 5 micron, 10 micron, 30 micron etc). I make the wall as trap boundary to try\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\/\" \/>\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=\"Keeping concentration same for different sized particles in discrete phase model | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am doing a dpm injection from one side of a cylinder towards the other side in the axial direction. i currently start with particles of 300 nm diameter and then want to inject other different sized particles ( 5 micron, 10 micron, 30 micron etc). 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I make the wall as trap boundary to try\" \/>\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\\\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\\\/#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\\\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\\\/#listItem\",\"name\":\"Keeping concentration same for different sized particles in discrete phase model\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\\\/#listItem\",\"position\":4,\"name\":\"Keeping concentration same for different sized particles in discrete phase model\",\"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\\\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/keeping-concentration-same-for-different-sized-particles-in-discrete-phase-model\\\/\",\"name\":\"Keeping concentration same for different sized particles in discrete phase model | Ansys Learning Forum\",\"description\":\"I am doing a dpm injection from one side of a cylinder towards the other side in the axial direction. i currently start with particles of 300 nm diameter and then want to inject other different sized particles ( 5 micron, 10 micron, 30 micron etc). 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