Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used wall thickness for the solid in boundary condition. I have seen on the forums to use shell conduction as well for the thickness of solid domain. Now as soon as i run define the solid domain with wall thickness option the results are different than that of after using shell conduction. why is that so? which is more accurate and recommended?

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