Two plates at different temperatures with fluid between them is the reference case for conjugate heat transfer: the heat conducts through the solid, crosses the interface and is carried away by the fluid.
The essential setup detail is the interface. The solid and fluid regions must share coupled walls so that the temperature and the heat flux are computed on both sides rather than imposed. If you set a fixed temperature at the wall instead, you are prescribing the answer.
Whether the fluid moves by natural or forced convection changes what you must resolve. Natural convection is driven by density differences, so buoyancy has to be enabled and the thermal boundary layer near each plate needs enough cells to capture the gradient.
In this tutorial, you will learn how simulate heat transfer between plates with different solid materials. In addition to this, you will learn how to create an interface using Ansys Fluent.
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