{"id":157174,"date":"2022-06-06T08:32:59","date_gmt":"2022-06-06T08:32:59","guid":{"rendered":"\/knowledge\/forums\/topic\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\/"},"modified":"2022-06-06T08:32:59","modified_gmt":"2022-06-06T08:32:59","slug":"what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\/","title":{"rendered":"What is the maximum number of UDM and UDS that can be defined?"},"content":{"rendered":"<p>A UDS (User Defined Scalar) is a function that can calculate advection and diffusion of a defined scalar and a UDM (User Defined Memory) is a memory that can store any number in a cell. Both are customizable in a UDF. The number used is specified by the user, but the maximum defined amounts are 50 UDS and 500 UDM. Note that defining many UDM and UDS will increase the memory consumption of the calculation. The values of the UDM are also stored in the data file.<\/p>\n","protected":false},"template":"","class_list":["post-157174","topic","type-topic","status-publish","hentry","topic-tag-ansys-fluent","topic-tag-udms","topic-tag-udss"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"A UDS (User Defined Scalar) is a function that can calculate advection and diffusion of a defined scalar and a UDM (User Defined Memory) is a memory that can store any number in a cell. Both are customizable in a UDF. The number used is specified by the user, but the maximum defined amounts are\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"What is the maximum number of UDM and UDS that can be defined? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"A UDS (User Defined Scalar) is a function that can calculate advection and diffusion of a defined scalar and a UDM (User Defined Memory) is a memory that can store any number in a cell. Both are customizable in a UDF. 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The number used is specified by the user, but the maximum defined amounts are\" \/>\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\\\/knowledge\\\/forums\\\/topic\\\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-fluent\\\/#listItem\",\"name\":\"ansys-fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-fluent\\\/#listItem\",\"position\":3,\"name\":\"ansys-fluent\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-fluent\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\\\/#listItem\",\"name\":\"What is the maximum number of UDM and UDS that can be defined?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\\\/#listItem\",\"position\":4,\"name\":\"What is the maximum number of UDM and UDS that can be defined?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/ansys-fluent\\\/#listItem\",\"name\":\"ansys-fluent\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/what-is-the-maximum-number-of-udm-and-uds-that-can-be-defined-2\\\/\",\"name\":\"What is the maximum number of UDM and UDS that can be defined? | Ansys Knowledge\",\"description\":\"A UDS (User Defined Scalar) is a function that can calculate advection and diffusion of a defined scalar and a UDM (User Defined Memory) is a memory that can store any number in a cell. 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