{"id":359788,"date":"2024-04-01T10:46:04","date_gmt":"2024-04-01T10:46:04","guid":{"rendered":"\/forum\/forums\/topic\/can-not-achieve-a-pseudo-steady-state-condition\/"},"modified":"2024-04-01T10:46:04","modified_gmt":"2024-04-01T10:46:04","slug":"can-not-achieve-a-pseudo-steady-state-condition","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/can-not-achieve-a-pseudo-steady-state-condition\/","title":{"rendered":"Can not achieve a pseudo-steady-state condition"},"content":{"rendered":"

I am trying to simulate 2D conjugate heat transfer over a finned surface. The simulation works fine and shows some results as shown below which is temperature profile. <\/p>\n

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But, the problem is that the wall temperature keeps rising even after simulating it for 60 seconds of time (transient) as shown below. <\/p>\n

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I expect the wall temperature to reach some pseuso-steady state condition (like shown below). But it does not reach that stage. <\/p>\n

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I have made mesh really small (having minimum cell size = 0.00005 m) and time step of 0.00005 s, which are the smaller values than what I see in literature. So, I think mesh or time step is not the problem. Also I use second order schemes. I tried all SIMPLE, PISO and coupled. and all does not show the desired result (Temp keeps rising)<\/p>\n

I have also seen similar problem with other software as well. I am sure I have been doing something fundamental mistake here. What is it? <\/p>\n","protected":false},"template":"","class_list":["post-359788","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-2d-heat-conduction-1","topic-tag-conjugate-heat-transfer","topic-tag-convection"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t