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Conjugate Heat Transfer Analysis Problem

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Old   June 16, 2015, 22:06
Default Conjugate Heat Transfer Analysis Problem
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I am doing a transient conjugate heat transfer analysis between a solid zone and a fluid zone in 2 steps in Ansys Fluent. In step 1, the fluid zone has fluid 1 with high velocity (forced convection). However, in step 2, I have stationary fluid 2 (natural convection) in the fluid cell zone.

I changed the material of the fluid cell zone in step 2 and also changed the BC as required. The simulation runs okay, but the results are not right. For some reason the heat transfer in step 2 is slowed down significantly. Even the temperature change in the solid zone is very low which is not acceptable. All on a sudden, the system is heading towards steady state, but that is not the actual case.

Any suggestion?
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Old   June 16, 2015, 23:39
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The results of the first step is okay. The heat transfer as well as flow velocity looks okay. The problem is with the second step only.
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