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Air Heating Up Rapidly

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Old   January 1, 2019, 14:14
Question Air Heating Up Rapidly
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Thomas
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Hey guys,

I have made a transient cfx simulation consisting of two concrete slabs and air between them (with steel members too but this is irrelevant). I have defined all the materials and boundary conditions and i am heating up with temperature (time dependent) one side (wall) of the "sandwich". My problem is that after convergence post shows that actually concrete heats up at a reasonable rate that makes sense but the air in-between has unexplained crazy high temp. What am i missing? Cant find what the problem is....

I am a beginner in CFX (actually is my first simulation) coming from the mechanical background so be gentle
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Old   January 2, 2019, 06:24
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Glenn Horrocks
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Is your simulation adequately converged? I strongly suspect not. Converge to a tighter tolerance. Also, for Conjugate Heat Transfer (CHT) simulations like this you should include imbalances in the convergence criteria. Residuals alone are a poor estimate of convergence for CHT simulations.
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Old   January 16, 2019, 15:20
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Hey thanks for your answer! I will check it out thoroughly during the next days and come back to you, if there is any progress.
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ansys 16, cfx & air content, heat transfer, transient

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