{"id":295567,"date":"2023-07-31T07:41:37","date_gmt":"2023-07-31T07:41:37","guid":{"rendered":"\/forum\/forums\/reply\/295567\/"},"modified":"2023-07-31T07:41:37","modified_gmt":"2023-07-31T07:41:37","slug":"295567","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/","title":{"rendered":"Reply To: Reverse flow problem"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;It means species transport has an issue.&lt;\/p&gt;&lt;p&gt;A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.&lt;\/p&gt;&lt;p&gt;You can try to start with a higher laminar mass diffusivity for the species and then slowly drop it.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-295567","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=\"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/\" \/>\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: Reverse flow problem | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-07-31T07:41:37+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T07:41:37+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Reverse flow problem | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). 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The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295567\\\/#breadcrumblist\"},\"datePublished\":\"2023-07-31T07:41:37+00:00\",\"dateModified\":\"2023-07-31T07:41:37+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Reply To: Reverse flow problem | Ansys Learning Forum","description":"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/#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\/295567\/#listItem","name":"Reply To: Reverse flow problem"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/#listItem","position":2,"name":"Reply To: Reverse flow problem","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\/295567\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/","name":"Reply To: Reverse flow problem | Ansys Learning Forum","description":"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/#breadcrumblist"},"datePublished":"2023-07-31T07:41:37+00:00","dateModified":"2023-07-31T07:41:37+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: Reverse flow problem | Ansys Learning Forum","og:description":"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence.You can try to start with a higher laminar","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295567\/","article:published_time":"2023-07-31T07:41:37+00:00","article:modified_time":"2023-07-31T07:41:37+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Reverse flow problem | Ansys Learning Forum","twitter:description":"Hi,It means species transport has an issue.A very low species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). 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