{"id":186995,"date":"2021-07-29T10:36:31","date_gmt":"2021-07-29T10:36:31","guid":{"rendered":"\/forum\/forums\/reply\/186995\/"},"modified":"2021-07-29T10:36:31","modified_gmt":"2021-07-29T10:36:31","slug":"186995","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/186995\/","title":{"rendered":"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues)"},"content":{"rendered":"<p>Rather than using a species model I&#8217;d just work out the density &#038; viscosity at the relevant pressure &#038; temperature and input that as a single species.  Unless the atmospheric composition is changing you&#8217;re wasting cpu time solving species equations for no reason. <br \/>\nTo set pressures etc elsewhere, you want Patch.  To set the materials by zone, you do this via the Cell Zone condition so need the two (or more) zones to have recognisable labels (Named Selections).  The mesh sections don&#8217;t appear to be connected, is this intentional? <\/p>\n","protected":false},"template":"","class_list":["post-186995","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Rather than using a species model I&#039;d just work out the density &amp; viscosity at the relevant pressure &amp; temperature and input that as a single species. Unless the atmospheric composition is changing you&#039;re wasting cpu time solving species equations for no reason. To set pressures etc elsewhere, you want Patch. To set the materials\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/186995\/\" \/>\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=\"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues) | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Rather than using a species model I&#039;d just work out the density &amp; viscosity at the relevant pressure &amp; temperature and input that as a single species. Unless the atmospheric composition is changing you&#039;re wasting cpu time solving species equations for no reason. To set pressures etc elsewhere, you want Patch. To set the materials\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/186995\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-07-29T10:36:31+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-07-29T10:36:31+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues) | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Rather than using a species model I&#039;d just work out the density &amp; viscosity at the relevant pressure &amp; temperature and input that as a single species. Unless the atmospheric composition is changing you&#039;re wasting cpu time solving species equations for no reason. To set pressures etc elsewhere, you want Patch. To set the materials\" \/>\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\\\/reply\\\/186995\\\/#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\\\/forums\\\/reply\\\/186995\\\/#listItem\",\"name\":\"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues)\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/186995\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues)\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@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\\\/reply\\\/186995\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/186995\\\/\",\"name\":\"Reply To: Simulation of a Rover on Titan (Atmosphere and internal Pressure issues) | Ansys Learning Forum\",\"description\":\"Rather than using a species model I'd just work out the density & viscosity at the relevant pressure & temperature and input that as a single species. Unless the atmospheric composition is changing you're wasting cpu time solving species equations for no reason. To set pressures etc elsewhere, you want Patch. 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