{"id":47238,"date":"2020-08-11T05:15:52","date_gmt":"2020-08-11T05:15:52","guid":{"rendered":"\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/"},"modified":"2020-08-11T05:15:52","modified_gmt":"2020-08-11T05:15:52","slug":"sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/","title":{"rendered":"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent)"},"content":{"rendered":"<p>Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. Currently, I am comparing these results with Ansys thermal and hence  I have used a fluid with very low thermal conductivity (1e- and low specific Heat (1e-5) so that is practically does not affect heat transfer. nIn this case, since the solid-1 is at high temp, radiative heat transfer should take place and temp of solid 2 should gradually increase.nThe problem is, no matter what the time step size is, the Area weighted average temp of solid 2 jump to 400 K just after first time step. This is unrealistic. The same setup in ANSYS Thermal shows gradual temp rise.nWhat can cause such sudden temperature increase? I would appreciate your assistance.nnSome other details of the problemnSolver : 2-D transient Fluent solver with S2S Radtiation modelnProperties of  solid 2: Density : 1300 kg\/m3, Cp : 1100 J\/kg-K, Thermal Cond : 0.58 W\/m-KnMesh : 2-D quad mesh mesh with size ~ 5mmnTime step : 0.1 snTransient Formulation : First order implicitnn<\/p>\n","protected":false},"template":"","class_list":["post-47238","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. Currently, I am comparing these results with Ansys thermal and hence I have used\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/\" \/>\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=\"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent) | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. Currently, I am comparing these results with Ansys thermal and hence I have used\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-08-11T05:15:52+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-08-11T05:15:52+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent) | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. 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Currently, I am comparing these results with Ansys thermal and hence I have used\" \/>\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\\\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\\\/#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\\\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\\\/#listItem\",\"name\":\"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent)\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\\\/#listItem\",\"position\":3,\"name\":\"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent)\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@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\\\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\\\/\",\"name\":\"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent) | Ansys Learning Forum\",\"description\":\"Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. 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The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. Currently, I am comparing these results with Ansys thermal and hence I have used","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/#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\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/#listItem","name":"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent)"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/#listItem","position":3,"name":"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent)","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}}]},{"@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\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sudden-temperature-jump-in-transient-heat-transfer-simulation-with-s2s-model-fluent\/","name":"Sudden Temperature Jump in Transient Heat Transfer Simulation with S2S Model (Fluent) | Ansys Learning Forum","description":"Hello,nI am solving transient heat transfer problem (in Fluent) between two solids using S2S radiation model.nSolid 1 is at fixed temperature of 1073 K. The initial temperature of Solid 2 is 300 K. (Fig 1)nThere is fluid body between two solids. 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